Plantes Cryptogames de France. Par I. B. H. I. Desmazières. Fasc. XVII. Lille, 1836

Summary

A new genus and species of pilargid polychaete, Litocorsa stremma, is described from silty grounds on the west coast of Scotland. Its relationship to other pilargid genera is discussed. Notes on two other pilargid species and a revised key to the genera of the Pilargidae are given.     

XXX.—Trichoptera collected in Morocco by Messrs. K. H. Chapman and G. A. Bisset

Summary

The tube-building amphipod Microdeutopus gryllotalpa Costa was successfully reared through several generations in the laboratory. Females produced young at six to eight day intervals, as many as eleven broods being produced during the two-month reproductive life of a single female in the laboratory. Brood numbers increased and decreased cyclically throughout the breeding period of any one female and a maximum of 58 young in a single brood was recorded. At 21°C young moulted at five-day intervals during their early instars and at about nine to ten day intervals in their later stages. Both sexes reached sexual maturity after the ninth moult, but males continued to differentiate morphologically after attaining sexual maturity.