ISOPODS 



223 



JANIROPSIS CALIFORNICA sp. nov. 



Type from Sausalito, California. 



Body narrow, elongate ; surface smooth ; color uniformly whitish. 

 Head with a prominent rounded median lobe on the anterior margin ; 

 lateral angulations rounded ; lateral margins straight and converging 

 toward the base. Eyes black, distinct, but small 

 and simple in structure. First pair of antennae 

 are composed of six joints and extend nearly to 

 the middle of the fifth joint of the peduncle of the 

 second pair of antennae. Second pair of antennas 

 are about equal to one third the length of the 

 body; the flagellum is composed of nineteen or 

 twenty joints. 



The first thoracic segment is but little wider 

 than the head ; the margins are entire, lateral 

 lobes rounded. The second segment has the lat- 

 eral margin straight, with the epimeron showing 

 slightly along the edge. The third and fourth 

 segments have the anterolateral lobe rounded, 

 the posterior margin straight, 

 with the epimeron showing 

 as a rounded lobe. The 

 fifth, sixth, and seventh seg- 

 ments have rounded lat- body (x 41). 

 eral margins, with epimera showing on the pos- 

 terior part of the segments. 



Terminal segment rounded posteriorly with smooth 

 margins, and a median lobe between the uropoda. 



Uropoda very short, about half as long as the 

 terminal segment. Branches about equal in length 

 and twice as long as the peduncle. 



Legs simple, ambulatory, similar in shape and 

 size and bi-unguiculate. 

 Only two good specimens, both females, were taken at Sausalito, 

 California, by Dr. Ritter and party. Two imperfect specimens also are 

 from the same locality. 



Until now the only other known species of this genus was Janiropsis 

 brevirenms Sars.i As that author has pointed out, this genus differs from 

 Janira, to which it is very closely related, in the much shorter uropoda ; 

 1 Crustacea of Norway, 11, p. 98, 1899. 



Fig. 108. Janiropsis califor- 

 nica sp. nov. Anterior part of 



Fig. 109. Janiropsis cali- 

 fornica sp. nov. Terminal 

 part of body (X 41)- 



