320 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



FIG. 351. ClLIC^A CARINATA 

 LATERAL VIEW. 



FIG. 352. ClLIC-EA CARINATA. 

 ABDOMEN. 



The abdomen is composed of two segments, the first segment being 

 formed of several coalesced segments, as indicated by two suture 

 lines. In the center of this segment are two longitudinal ridges, placed 

 obliquely, so as almost to meet anteriorly and to spread apart at the 



other extremity. This segment projects down 



over the last segment at either side. The last 



segment has a deep ex- 

 cavation at its posterior 



extremity, around and 



above which is a cari- 



nated ridge extending 



entirely around the 



whole of the posterior 



half of the segment. 



Two small longitudinal 



ridges are in the center 



of the segment. The inner branch of the uropoda is very short, not 

 reaching the extremity of the abdomen by some distance; it is quad- 

 rangular in shape, with sides nearly parallel, and obliquely truncated 

 at the end. The outer branch of the uropoda is long, curved, and 

 pointed at the end, resembling a hook somewhat. 



The color is a light yellow. In appearance the little isopod is very 

 rough and rugged looking. 



There is but one specimen, which was found off the coast of Georgia. 

 Depth. 440 fathoms. 

 Type.**,. No. 23907, U.S.N.M. 



Family XII. SEROLID^. 



Body strongly depressed. 



Both pairs of antennae multiarticulate with well-defined peduncle 

 and flagellum. Mandible with palp. Maxillipeds with a triarticulate 

 palp. Head posteriorly fused with first thoracic segment. 



Seventh thoracic segment entirely wanting on dorsal side. 



Abdomen composed of four segments, three anterior to the large 

 terminal segment. 



Uropoda lateral, with both branches free and subequal. First two 

 pairs of legs subchelate in male, second pair smaller than first; .only 

 first pair subchelate in female; last pair of legs smaller than any of 

 the preceding pairs. 



First three pairs of pleopods natatory; fourth and fifth pairs bran- 

 chial; outer branch of fourth pair forming an operculum. 



Marsupium consists of four pairs of plates. 



S3. Genus SEROLIS Leach. 



With characters of family. 

 Only genus known. 



