190 



CONNECTICUT GEOL, AND NAT. HIST. SURVEY, [Bull. 



The food of the Isopoda consists for the most part of mol- 

 luscs, annelids, Crustacea, and fish which are consumed generally 

 when dead. Cirolana concharum feeds on the blue crab, from a 

 sino-le specimen of which as many as 108 individuals have been 

 taken. The stomachs of terrestrial forms have been found to 

 contain moss cells and algae. 



Besides the Bopyrids there are several other forms which are 

 also parasitic. The Cymothoidae and yEgidae attach themselves to 

 the fins, gills, and mouths of fishes. ALgathoa oculata has been 

 taken from the mouth of a squid and also from a young mullet. 

 The Bopyridae are all parasitic on Crustacea and attach them- 

 selves to the abdomen or within the branchial cavity beneath the 

 carapace. 



The secondary sexual differences which occur among the 

 native Isopoda are less marked than among the Amphipoda. In 

 the Tanaidas the legs of the first pair in the males are much more 

 robust and longer than those of the females but of similar form. 

 In Leptochelia the males have greatly elongated first gnathopods 

 and antennae while the females have these parts much reduced. 



The development of several genera, Jccra, Aselliis, Ligia, 

 Cymothoa, Porcellio, and Arnwdillidium has been described fully 

 by McAIurrich, 1895 (Journal Morphology, vol. 11, pp. 63-155). 



LIST OF SPECIES. 



In the following list of Isopoda, an * before a species indicates 

 that it has not been reported from Connecticut although it has 

 been reported from adjacent regions and may be expected in this 

 state as well ; a f indicates that the species occurs in fresh water ; 

 and a J that the species is terrestrial.^ 



TANAioiDEA Or CHELiFERA. Edotca triloba (Say). 



Tanaidse E. montosa (Stimpson). 



Tanais cavolinii Milne-Edwards. Erichsonella attemiata (Harger). 



Leptochelia savignyi (Kroyer). E. iiliformis (Say). 

 *L. rapax Harger. 



I Since the manuscript of this paper was comploted Profosser A. E. Verrill has informed 

 mc of two species of Isopoda which have not hitherto been recorded from Connecticut, but 

 which he had collected during the past two years at the Thimble Islands. These two spe- 

 cies I believe will be figured by Professor Verrill in his forthcoming report on the Higher 

 Crustacea of Connecticut, to be published in this series. The two species are Olenctra prcs- 

 gustator. parasitic on the mouth and gills of menhaden, and lone thompsoni,. parasitic on 

 the gills of Callianassa stimpsoni. 



