No. 26.] ARTHROSTRACA OF CONNECTICUT. 4I 



enveloped in a gelatinous capsule, so that when removed from 

 the marsupium each egg mass retains its form. The young 

 remain in the marsupium for some time after their escape from 

 the egg and in some species it has been noted that the young 

 return to the brood-pouch when forcibly removed from it. 

 Observations are scarce regarding the length of time that the 

 brood-pouch is occupied by the eggs and young, but in Orchestia 

 palustris it may not be more than two weeks. Some specimens of 

 Gammarus locusta kept in the laboratory were found to retain 

 the eggs and young from two to two and a half weeks. 



From observations made on Amphipoda collected at Woods 

 Hole as well as at Noank and New Haven, females were found 

 carrying eggs on the following dates : 



Hyperia, Apr. 4 to June 3. 



Orchomenella pinguis, Jan. 23. 



Ampelisca spinipes, July 13 to Aug. 15. 



Byblis serrata, July 23. 



Stenothoe minuta, Aug. and Sept. 



Lafystius sturionis, Oct. 20 and Nov. 24. 



Calliopius Icrvius cuius, Jan. 11, 22; April i, 20, 27; May 6, 

 21; July 31; Aug. I, 6, 29; Dec. 11, 25. 



Sympleustes glaber, April and July 13, 



Batea secunda, Aug. 23. 



Pontogeneia inermis, July 13. 



Melita nitida, Aug. 17. 



Elasmopus Icvis, Aug. 15, 17. 



Gammarus locusta, May 3 ; July 31 ; Aug. 6-19. 



G. annulatus. Mar. 6; Apr. i, 20, 27; May; June 21. 



Carinogammarus mucronatus, Aug. 14, 17. 



Orchestia agilis. May; June; first two weeks of July; Aug. 13 

 very few eggs. 



Orchestia palustris, July 9, 21. 



Talorchestia longicornis, June 14 (according to Bumpus, eggs 

 in a late stage of development) to Aug. 13. (Miss 

 Smallwood found the young free in the sand at Cold 

 Spring Harbor and very few females bearing young 

 by the end of July.) 



Allorchestes littoralis, Aug. 18. 



Microdeutopus gryllotalpa, July 13 to Aug. 18. 



