92 RATHBUN 



pace; the flagellum may equal the length of the body. The maxil- 

 lipeds exceed the scale by one fourth or more of the length of the last 

 segment. The first pair of feet extended overreach the antennular 

 peduncle ; the second pair reach the tip of the maxillipeds ; the fifth pair 

 extend to or beyond the end of the antennal scale. The dactyli of the 

 third, fourth, and fifth pairs are short and very stout, and armed with 

 strong spines. 



The third abdominal segment in profile is smoothly rounded ; poste- 

 riorly it is strongly produced over the fourth ; the fourth has a spine on 

 either side ; the sixth is twice as long as the fifth ; the seventh is longer 

 than the sixth and bears 4 or 5 spines on either side. 



Ma/e.~The males are smaller and their antennulae a little longer than 

 in the females. 



Dimensions. — Female, length 57 mm., length of carapace and rostrum 

 22.7 mm., of rostrum 11.5 mm. 



Disffidufio/i.— Bering Sea southward and eastward to Washington, 

 60 to 516 fathoms, at the following stations of the Albatross : 



01? Pribilof Islands, 81 and 276 fathoms, stations 3602, 3608. 



North of Rat Islands, 270 fathoms, station 3785. 



Off Seguam, Aleutians, 283 fathoms, station 3480 (type locality). 



North of Unalaska, 309-406 fathoms, stations 3316, 2>ZZ^~ZZZ'^' 



Off North Head, Akutan Island, 72 fathoms, station 2842. 



Off Trinity Islands, 159 fathoms, station 2853. 



Off Sitkalidak Island, 60 fathoms, station 2854. 



Off Queen Charlotte Sound, British Columbia, 204 fathoms, station 2861. 



Off Destruction Island, Washington, 516 fathoms, station 3343. 



Variations. — Specimens from the two southernmost localities show a 

 tendency to differ from the types ; the lower limb of the rostrum is nar- 

 rower, the rostrum shorter and more ascending, the antennular peduncle 

 longer and its basal scale shorter than in the types. A larger series 

 might serve to differentiate the southern from the northern form, but at 

 present they are combined. 



SPIRONTOCARIS MAXILLIPES Rathbun. 

 Spirontocaris maxillipes Rathbun, Proc. U. S. Nat. Mus., xxiv, 898, 1902. 

 Very near S. moseri, but distinguished as follows: The rostrum is 

 shorter, only about four fifths as long as the carapace, and has usually 

 fewer teeth, 5 to 8 above, 2 to 6 below. The antennular peduncle reaches 

 two thirds or more of the length of the antennal scale ; the second seg- 

 ment is a little longer than in S. moseri. The thickened portion of the 

 outer flagellum overreaches the scale by about half its length. The spine 

 of the antennular acicle scarcely reaches the middle of the second seg- 



