90 RATHBUN 



it is furnished with a rudimentary epipod, or with a fully developed one. 

 The last pair of pereiopods reach the end of the antennal scale. 



The fourth abdominal segment is provided with a spine on either side 



FIG. 38. Spirontocaris suckleyi. 9 (X .2!)- Station 3334. a. Side. b. Dorsal 

 view of anterior portion. 



below. The sixth segment is a little shorter and broader than in S. 

 townsendi. 



Malt.hs in S. townsendi ', the male resembles the female, except for 

 being smaller, more slender, and with longer antennules. 



S. suckleyi differs from S. gaimardii in the fewer dorsal spines, 5 or 6 

 against 7 or 8 in S. gaimardii; in the larger eyes ; in the antennular 

 peduncle of the female reaching middle of antennal scale ; in the absence 

 of hook or hump on the third abdominal segment in the male ; in the 

 slightly shorter sixth segment; and in the absence usually of an epipod 

 from the second pereiopod. 



Variations. In about three hundred specimens examined only one 

 lacks the spines on the fourth abdominal segment ; in another specimen 

 the spine is present on one side, absent on the other. 



Dimensions. Length of ? (station 2864) approximately 79 mm., 

 length of carapace and rostrum 28.7 mm., of rostrum 16 mm. 



Distribution. From the Arctic coast of Alaska southward to Wash- 

 ington; 6 to 165 fathoms. 



Taken by the Albatross at the following stations : 

 Off the Pribilof Islands, 20-65 fathoms, stations 3438, 3439, 3483, 3494, 



3496, 3504, 3535, 3538, 3552, 3560, 3561, 3611, 3637. 

 Bristol Bay, 19 fathoms, station 3237. 



