78 



RATHBUN 



On the few specimens examined the superior teeth are 4 ; the inferior 

 vary from 4 to 8. 



Stimpson says that the thick fiagellum of the antennulae extends to the 

 end of the rostrum ; this is probably true of the S • All the specimens in 

 hand are females, in which the flagellum extends only about two thirds 

 the length of the rostrum. 



Dimensions. — Approximate length of ? with eggs 48.4 mm., length of 

 carapace and rostrum 18 mm., of rostrum 10.5 mm. 



SPIRONTOCARIS FLEXA Rathbun. 



Spirontocaris camtschaiica Rathbun, The Fur Seals and Fur-Seal Islands 

 of the North Pacific Ocean, Pt. lii, 557, 1899. Not S. camtschaiica 

 (Stimpson). 



Spirontocaris Jiexa Rathbun, Proc. U. S. Nat. Mus., xxiv, 896, 1902. 



Female. — Slender. Carapace crested on its anterior third ; rostrum 

 longer than the carapace, armed with 4 or 5 teeth above, including i or 

 2 on the carapace ; anterior tooth near middle of rostrum ; anterior half 

 of rostrum not limbed above. Rostrum very slender, nearly horizontal, a 



Fig. 32. Spirontocaris Jiexa. ? . Station 2850. a. Side of carapace and abdo- 

 men (X 2). b. Dorsal view of anterior portion (x 3)- 



little arched above the eye ; lower limb narrow and armed with from 5 to 

 8 spines ; tip reaching nearly to or a little beyond the end of the antennal 

 scale. An antennal and a pterygostomian spine, the latter well developed. 

 Antennular peduncle reaching one third the length of the antennal 

 scale ; basal spine to a little beyond first segment ; thickened portion of 

 outer flagellum reaching to about distal third of antennal scale; inner 

 flagellum to end of scale. Spine of antennal scale not nearly as advanced 

 as the membranous portion. Peduncle of antenna advanced as far as 

 the second antennular segment ; flagellum nearly as long as body. 



