STALK-EYED CRUSTACEA 355 



cylindrical ; the posterior pair slender, chelate, folded in 

 either branchial chamber ; abdominal appendages only- 

 present in the female, consisting of a rudimentary pair 

 on the first segment, and a single uniramous appendage 

 on each of the four following segments (in Hapalogaster, 

 Stimpson, the first of these is biramous). These last 

 appendages are situated on the left side of the abdomen, 

 which is more or less enlarged at the expense of the other 

 side. Thoracic sterna broad. Antennular peduncles cylin- 

 drical and of moderate size, with short flagella. 



They live in shallow or deep water in temperate and 

 cold regions. They have been found at the Azores, but 

 I have not come across any mention of them from the 

 West Indies; however, as they may be found . there, or 

 about Bermuda, I mention them. At first inspection 

 they resemble crabs of the subtribe OxyrJiyncJia, but are 

 easily distinguished by the last pair of legs being much 

 reduced in size. 



One family. 



Family Lithodids. 



hithodidcB . . . Dana, Henderson. 

 The same as the Section. 



Genus Lithodes. 



•Rostrum long, and spinulous. Abdomen with the 

 third, fourth, and fifth segment provided with paired 

 calcified plates, which in the female are very large on 

 the left side ; the median portion membranous, with 

 scattered calcareous particles. 



LWwdcs agassizii (Smith) has very large spines on the 

 carapace and rostrum. 



Range. — Azores, East Coast of the United States. 



