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 antennulz extends to the 
end of the rostrum; this is probably true of the 4. 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 9 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. III, 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 1 or 
2 on the carapace; anterior tooth near middle of rostrum; anterior half 
of rostrum not limbed above. Rostrum very slender, nearly horizontal, a 

Fic. 32. Spirontocaris flexa. @. Station 2850. a. Side of carapace and abdo- 
men (X 2). 8. 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. 
