Invertebrate Reproduction and Development (1991) Contents Volume 20 Vol. 20 No. 1 1 Review Article: Gene regulation in insect reproduction G.R. Wyatt (Ontario) 37 Analysis of hemolymph ecdysteroids in the female earwig: Labidura riparia Michel Vancassel (Rennes), Maryvonne Foraste (Rennes), Colete Strambi (Marseille), Alain Strambi (Marseille) and Jean-Paul Delbeque (Dijon) Fecundity and age structure of freshwater and marine populations of the polar isopod Mesidotea entomon (L.) R.E. Korczynski (Winnipeg) The effect of pulse-feeding a protein diet on ovarian maturation, vitellogenin levels, and ecdysteroid titre in houseflies, Musca domestica, maintained on sucrose T.S. Adams and J.W. Gerst (Fargo) An immunoassay for the androgenic gland hormone of the terrestrial isopod, Armadillidium vulgare Yuriko Hasegawa (Yokohama), Kazu Haino-Fukushima (Tokyo) and Yasutoshi Katakura (Yokohama) Development of isolated spermducts from Heliothis virescens (Lepidoptera) in vitro M.J. Loeb (Beltsville) Cytology of Parthenogenesis in Bacillus whitei and Bacillus lynceorum (Insecta Pharmatodea) O. Marescalchi (Bologna), L.P. Pijnacker (Haren) and V. Scali (Bologna) 20 No. 2 Cheliped regeneration in the megalopa of the mud crab, Rhithropanopeus harrisii (Gould) G. Lumb (Durham, NC), A.S. Clare and J.D. Costlow (Beaufort, NC) Cytochemical analysis of lectin labeling in mantle epithelial cells of Loligo vulgaris, Loligo forbesi and Sepia officinalis embryos and juveniles W.P. Paulij, C.J.M. Verspaandonk, M.G.A.H. Verberne and J.M. Denuce (Nijmegen) Intraspecific variation in somatic cell turnover and regenerative rate in the freshwater planarian Dendrocoelum lacteum R. Romero, J. Baguna (Barcelona) and P. Calow (Sheffield) Scanning electron microscopical confirmation of spongy and interstitial cell structure in Dysdercus Koenigii F. Testis B.P. Saxena and K. Tikku (Jammu Tawi) Short Communication Sex expression and environmental stress in a mollusc, Pinctada margaritifera L.V. Dolgov (Vladivostok) The spermatogenic cycle and role of the hermaphrodite duct in sperm storage in two desert snails A.N. Hodgson (Grahamstown) and M. Shachak (Sde Boger) Phylogenetic trends and variation in the ultrastructure of the spermatozoa of sympatric species of South Africa patellid limpets (Archaeogastropoda, Mollusca) B.G.M. Jamieson (Brisbane), A.N. Hodgson and R.T.E. Bernard (Grahamstown) Invertebrate Reproduction and Development (1991) Contents Volume 20 Vol. 20 No. 1 1 Review Article: Gene regulation in insect reproduction G.R. Wyatt (Ontario) 37 Analysis of hemolymph ecdysteroids in the female earwig: Labidura riparia Michel Vancassel (Rennes), Maryvonne Foraste (Rennes), Colete Strambi (Marseille), Alain Strambi (Marseille) and Jean-Paul Delbeque (Dijon) Fecundity and age structure of freshwater and marine populations of the polar isopod Mesidotea entomon (L.) R.E. Korczynski (Winnipeg) The effect of pulse-feeding a protein diet on ovarian maturation, vitellogenin levels, and ecdysteroid titre in houseflies, Musca domestica, maintained on sucrose T.S. Adams and J.W. Gerst (Fargo) An immunoassay for the androgenic gland hormone of the terrestrial isopod, Armadillidium vulgare Yuriko Hasegawa (Yokohama), Kazu Haino-Fukushima (Tokyo) and Yasutoshi Katakura (Yokohama) Development of isolated spermducts from Heliothis virescens (Lepidoptera) in vitro M.J. Loeb (Beltsville) Cytology of Parthenogenesis in Bacillus whitei and Bacillus lynceorum (Insecta Pharmatodea) O. Marescalchi (Bologna), L.P. Pijnacker (Haren) and V. Scali (Bologna) 20 No. 2 Cheliped regeneration in the megalopa of the mud crab, Rhithropanopeus harrisii (Gould) G. Lumb (Durham, NC), A.S. Clare and J.D. Costlow (Beaufort, NC) Cytochemical analysis of lectin labeling in mantle epithelial cells of Loligo vulgaris, Loligo forbesi and Sepia officinalis embryos and juveniles W.P. Paulij, C.J.M. Verspaandonk, M.G.A.H. Verberne and J.M. Denuce (Nijmegen) Intraspecific variation in somatic cell turnover and regenerative rate in the freshwater planarian Dendrocoelum lacteum R. Romero, J. Baguna (Barcelona) and P. Calow (Sheffield) Scanning electron microscopical confirmation of spongy and interstitial cell structure in Dysdercus Koenigii F. Testis B.P. Saxena and K. Tikku (Jammu Tawi) Short Communication Sex expression and environmental stress in a mollusc, Pinctada margaritifera L.V. Dolgov (Vladivostok) The spermatogenic cycle and role of the hermaphrodite duct in sperm storage in two desert snails A.N. Hodgson (Grahamstown) and M. Shachak (Sde Boger) Phylogenetic trends and variation in the ultrastructure of the spermatozoa of sympatric species of South Africa patellid limpets (Archaeogastropoda, Mollusca) B.G.M. Jamieson (Brisbane), A.N. Hodgson and R.T.E. Bernard (Grahamstown) Annual changes in the steroid levels in the testis and the pyloric caeca of Sclerasterias mollis (Hutton) (Echinodermata: Asteroidea) during the reproductive cycle R.A. Xu (Dunedin) Reproduction in the giant isopod, Bathynomus giganteus N.E. Perry and G.W. Hinsch (Tampa, FL) Haemolymph factor(s) potentiate the 20-hydroxyecdysone mediated stimulation of acid phosphatase activity in larval fat body of rice moth Corcyra cephalonica - In’ vitro studies M. Ashok and Aparna Dutta-Gupta (Ray) (Hyderabad) Localization of electrical current flow across the chorionated unfertilized egg of the locust, Locusta migratoria M.J. O'Donnell (West Hamilton, Ontario) and A.M. Shipley (Woods Hole, MA) 20 No. 3 On the morphogenetic role of juvenile hormone in the prepupal stage of Spodoptera mauritia Boisd. (Lepidoptera: Noctuidae) E. Balamani and V.S.K. Nair (Kerala) Development of genital imaginal discs of Heliothis virescens culture in vitro with 20-hydroxyecdysone and fat body or testis sheaths Marcia J. Loeb and Raziel S. Hakim (Washington, DC) In vitro uptake of larval haemolymph proteins by male accessory reproductive glands of the stem borer, Chilo partellus Preeti Mohamed Ismail (Bajaj) and Aparna Dutta-Gupta (Ray) (Hyderabad) Profile of embryonic ecdysteroids in the decapod crustacean Macrobrachium rosenbergii N.J. Young, S.G. Webster, D.A. Jones and H. H. Rees (Liverpool, Bangor and Menai Bridge) Ultrastructure of the mature sperm and spermiogenesis in Callista chione (Mollusca, Bivalvia) Antonietta Nicotra and Stefania Zappata (Rome) Relationship of claw form and exoskeleton condition to reproductive system size and methyl farnesoate in the male spider crab, Libinia emarginata Ellen Homola, Amir Sagi and Hans Laufer (Storrs, CT) An autoradiographic and immuno-cytochemical analysis of ecdysteroids and ecdysteroid binding sites in target cells of Drosophila melanogaster Ji-Da Dai, Madhabananda Sar, James T. Warren and Lawrence I. Gilbert (Chapel Hill, NC) The effect of food ration on the quality of eggs of Luidia clathrata (Say) (Echinodermata: Asteroidea) S.B. George, J.M. Lawrence and L. Fenaux (Villefranche Sur Mer and Tampa, FL) Fecundity of Cochlicella acuta (Muller) (Mollusca : Helicidae) in laboratory cultures G.H. Baker and B.G. Hawke (Glen Osmond) Patterns of protein synthesis and accumulation during oogenesis in the polychaete,Pseudopotamilla occelata Moore Hee Kyung Song and Yang Rim Lee (Seoul) Reproduction of the sea urchin Stomopneustes variolaris (Lam.) on the east coast of South Africa Anne E. Drummond (Pietermaritzburg) Addendum to M.J. Loeb, Vol. 19:2