ISO PODS OF NORTH AMERICA. 



455 



FIG. 507. JANIROP- 

 SIS CALIFOKNICA. 

 ANTERIOR PART 

 OF BODY, x 27. 



JANIROPSIS CALIFORNICA Richardson. 



Janiropsis calif ornica RICHARDSON, Harriman Alaska Exp., Crust., X, 1904, pp. 

 223-224; Proc. U. S. Nat. Mus., XXVII, 1904, pp. 666-667. 



Locality. Sausalito, California. 



Body narrow, elongate; surface smooth; color uniform!}' 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 tifth joint of the peduncle of 

 the second pair of antenna?. Second pair of antennae 

 are about equal to one-third the length of the body; the 

 flagelluni 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 lateral margin straight, 

 with the epimeron showing slightly along the edge. 

 The third and fourth segments have the antero-lateral 

 lobe rounded, the posterior margin straight, with the 

 epimeron showing as a rounded lobe. The fifth, sixth, 

 and seventh segments have rounded lateral margins, with epimera 

 showing on the posterior 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 ter-* 

 minal 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 Doctor Ritter and party. Two 

 imperfect specimens also are from the same locality. 



Until now the only other known species of this genus 

 was Janiropsis breviremus Sars. a As that author has pointed out, this 

 genus differs from Janira, to which it is very closely related, in the 

 much shorter uropoda; in the shorter second pair of antenna?; in the 

 structure of the first pair of antennae, which have the flagellum com- 

 posed of only a restricted number of articulations; in the structure of 

 the first pair of legs in the male, these being " remarkabty developed, 

 prehensile, much longer than any of the other pairs, with the carpal 

 joint fusiformly dilated;' 1 in the female, however, this pair does not 

 differ from the other legs, all being ambulatory in character. 



FIG. 608. JANI- 

 ROPSIS CALIFOR- 

 NICA. TERMINAL 



PART OF BODY. 



X 27. 



Crustacea of Norway, II, 1899, p. 



