150 RATHBUN 
duncle extends to the middle of the penultimate joint of the antennal 
peduncle. The outer flagellum is almost as long as the carapace and 
rostrum; the inner is a fifth longer than the outer. The scaphocerite 
projects as far as the middle of the second antennular segment, while 
the stylocerite projects to the end of the penultimate joint of the anten- 
nal peduncle; this joint is nearly 3 times as long as the last joint. The 
flagellum is broken off, but the part remaining reaches beyond the anten- 
nular flagella. 
The outer maxillipeds reach the end of the antennal peduncle. The 
first pair of chelipeds are missing. The second pair are rather narrow; 
the merus has 3 spines on its lower margin; the carpus is half as long as 
the merus and three fourths as long as the propodus; palm and fingers 
subequal ; lower margin of merus, carpus, and propodus fringed with long 
hair. ‘The third to fifth pairs of feet are slender; the lower margin of the 
distal half of the propodi is fringed with long hair; the dactyli are 
slender, those of the third and fourth pairs contained 3 times in their 
propodi, those of the fifth pair contained 4 times in their propodi. 
The abdomen is smooth above, but the pleura are sculptured and 
pubescent; the telson is elongate, subquadrilateral, lateral margins 
spinulous, dorsal surface with a few spines; caudal swimmerets about as 
long and as broad as the telson; inner one with two outer marginal 
spines, carina spinulous; outer branch with serrate outer margin, outer 
carina with 1 or 2 spinules, obliquely transverse suture bordered by slender 
spinules. 
Dimensions.—In the unique type, a female, the length of the carapace 
and rostrum along the median line is 19.6 mm., length of rostrum 3.5 
mm., of abdomen 31.5 mm. 
Lype locality.—Off Bodega Head, California, 62 fathoms (Albatross 
station 3172). 
From the other species on the west coast of North America, viz., Axius 
crista-galli Faxon and A. acutifrons (Bate), both of which occur off Pana- 
ma, A. sfinulicauda is readily distinguished by the five gastric carinze and 
the black eyes. 
Genus Calastacus Faxon. 
KEY TO THE SPECIES OF CALASTACUS. 
A. Carapace granulate; no spines behind those at base of rostrum, 
investigatoris. 
A’. Carapace not granulate; 5 rows of spines behind the rostrum, 
guingueseriatus. 
