88 



RATHBUN 



S. gaimardii belcheri southward. As typical S. gaimardii does not 

 occur on the Pacific coast, I will compare the new form with S. gai- 

 mardii belcheri, and indicate the characters by which it differs from the 

 latter. 



Female. In S. townsendi the rostrum reaches almost or quite to the 

 end of the acicle, and is armed above with 5 to 7 (2 on the carapace) 



spines, below with 

 3 to 6 spines ; the 

 lower limb is deeper 

 than in S. gaimardii 

 belcheri, more as in 

 typical S. gaimar- 

 dii, but the rostrum 

 is nearly straight. 

 The pterygostomi- 

 an spine is very 

 small. The scale 

 at the outer base 

 of the antennula 

 reaches to the end 

 or nearly to the end 

 of the second seg- 



FIG. 37. Spirontocaris ttnvnsendi. 9 . Station 2865. < 

 b. Dorsal view of anterior portion (X 3)- 



Side (x 



ment; the second 

 segment is scarcely longer than the third. The antennal scale is almost 

 as long as the carapace. The maxillipeds reach to the distal fourth of 

 the antennal scale ; the fifth pair of feet do not attain the end of the 

 maxilliped. 



The third abdominal segment is smoothly rounded, without lobe or 

 angle, in a profile view ; posterior margin produced moderately backward 

 at the middle. The fourth segment is devoid of a lateral spine ; the sixth 

 is about twice as long as high ; the telson is provided with 3 or 4 lateral 

 spinules on each side. 



Male. The males, which are fewer in number in the collection than 

 the females, appear to be smaller and a little more slender ; otherwise, 

 save for their longer antennulae, they present no differences from the 

 females. 



Dimensions. Female, approximate length 60.5 mm., of carapace and 

 rostrum 20 mm., of rostrum 10.6 mm. 



Distribution. Ranges from the Pribilof Islands to Puget Sound, and 

 from 21 to 114 fathoms. One exception to this bathymetrical range is 

 238 fathoms in Queen Charlotte Sound, British Columbia (Albatross 



