DECAPODS 103 
segment instead of reaching to the end of it; but the most striking char- 
acter is the unusual length of the fingers, which exceed the palm in 
length and are rather slender, giving the chele a Pulemon-like appear- 
ance; in the 9, on the contrary, the fingers are considerably shorter 
than the palm, as in most species of the genus. 
SPIRONTOCARIS STONEYI Rathbun. 
Spirontocaris stoneyi RATHBUN, Proc. U. S. Nat. Mus., XXIV, 899, 1902. 
Near 5S. cristata; a small, slender species. Rostrum about half as 
long as the carapace and reaching a little beyond first segment of anten- 
nular peduncle ; upper margin 
convex and armed with 7 to 
g teeth (1 or 2 of which are on 
carapace), except near the tip, 
where it is straight and un- 
armed; tip pointed; midrib 
nearly straight, lower margin 
with a tooth near the tip. A strong antennal, a short but 
slender pterygostomian, spine. 
Antennular peduncle reaching to middle of antennal scale; 
second segment one and a half times as long as third; outer 
scale not reaching end of first segment; thickened portion 
of outer flagellum reaching about to end of antennal scale. 
Scale as long as carapace; spine reaching as far as blade; 
peduncle reaching a little beyond first segment of anten- 
nular peduncle. Maxillipeds very slender, reaching to the 
distal third of the antennal scale; the first pair of feet to a little beyond 
the antennal peduncle, the palm widening distally and only a little 
longer than the fingers; second pair of feet about reaching tip of scale. 
Fourth abdominal somite unarmed; sixth long, over 1% times as long 
as fifth, and as long as telson, which has 3 pairs of side spines. 
Dimensions.— Female, length 20 mm., length of carapace and rostrum 
5.5 mm., of rostrum 1.8 mm. 
Type locality. —Bering Sea, lat. 629 15’ 00” N., long. 167° 48/ 00” W., 
20% fathoms (Lieutenant George M. Stoney, U.S. N., June, 1884). 

Fic. 46. Spirontocaris stoneyé 
(xX 5). Bering Sea. 
SPIRONTOCARIS AVINA Rathbun. 
Spirontocaris avina RATHBUN, The Fur Seals and Fur-Seal Islands of the 
North Pacific Ocean, III, 557, 1899. 
Carapace with anterior half carinated; rostrum half or less than half 
the length of the carapace, reaching to end of first antennular segment ; 
