CALIFORNIA STALK-EYED CRUSTACEA. 179 



Pacific (Station 3441 Albatross Collection) the carinas 

 of the first four abdominal segments fade out before 

 reaching the posterior end, but that of the fifth segment 

 ends behind in a tooth, and the two carinse of the sixth 

 segment terminate posteriorly in small, acute teeth. In 

 specimens from Vancouver's Island, according to Pro- 

 fessor Smith, ''the dorsal carina on the third, fourth, 

 and fifth segments of the abdomen is broad and rounded, 

 or flattened, and scarcely reaches the posterior edges of 

 the segments, and the two carinse on the sixth segment 

 are rounded and fade out in the same way before reach- 

 ing the posterior extremity of the segment.'' All of the 

 Pacific specimens I have seen of this species came from 

 farther north than Vancouver's Island, and it is an 

 interesting fact that they are intermediate in character, 

 as in locality, between specimens from the Atlantic and 

 the forms described by Professor Smith. 



Nectocrangon alaskensis Kingsley. 



Nectocrangon alaskensis Kingsley, Bull. Essex Inst., Vol. XIV, 1882, p. 

 128, Ortmann, Proc. Acad. Nat. Sci. Phila., 1895, p. 182. 



Carapace with four equally spaced, median spines and a small tooth 

 between the first spine at the anterior end and the second. Orbits elon- 

 gated. Antennular peduncles reaching about to the middle of the acicle. 

 The abdomen has no carina on the first four segments except a slight one 

 on the anterior portion of the first; the fifth segment has a prominent 

 carina, which ends behind in a spine. The two carinas on the sixth seg- 

 ment end behind in a spine. Telson acute, with three pairs of spines near 

 the tip. 



Alaska (Kingsley); Station 3257 Albatross Collection, 

 numerous specimens! 



Family NIKID^ 



Kostrum horizontal. Ocular peduncles free. Mandibles devoid of a 

 cutting edge and palp. First pair of pereopods simple or chelate. Second 

 pair chelate, longer than the first and more slender, the carpus multiar- 

 ticulate. 



