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 



1 Fig. 38. Spirontocaris suckleyi. 5 (x .25)- Station 3334. a. Side. b. Dorsal 



view of anterior portion. 



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

 townsendi. 



Male. — As 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.— hengih of $ (station 2864) approximately 79 mm., 

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



Distribxdion.-Yxova. 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. 



