88 



RATHBUN 



S. gaimardii helcheri 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. gahnardii 

 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- 

 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 foiurth 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. 



Diffiensions. — Female, approximate length 60.5 mm., of carapace and 

 rostrum 20 mm., of rostrum 10.6 mm. 



Dislridulion. — 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 



Fig. 37. 



Spirontocaris townsendi. %. Station 2865. a. Side (X 2j), 

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



