78 RATHBUN 



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

 vary from 4 to 8. 



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

 end of the rostrum ; this is probably true of the $ . 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 camtschatica RATHBUN, The Fur Seals and Fur-Seal Islands 

 of the North Pacific Ocean, Pt. ill, 557, 1899. Not S. camtschatica 

 (Stimpson). 



Spirontocaris flexa 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 flexa. $ . 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. 



