DECAPODS 3I 
Antennal scale as long or nearly as long as the carapace, oblong, the 
blade projecting considerably beyond the scale; preceding segment 
armed with a small spine at the outer base of the scale; peduncle not 
quite reaching end of first antennular segment; flagellum one and a third 
times the length of the body. 
Outer maxillipeds very slender, reaching when extended only a small 
bit beyond the antennal peduncle. Feet of first pair reaching nearly to 
end of scale, carpus longer than merus, enlarged distally, and more than 
twice as long as propodus, fingers subequal in length to palm and covered 
with hair. Feet of second pair reaching beyond scale by half the length 
of propodus; carpus one and a half times merus, propodus three fourths 
length of carpus and no wider than in the first pair; fingers shorter than 
palm. The third to fifth pairs of feet increase successively in length by 
about half the length of the dactyli; the fourth pair reaches just to the 
end of the scale; dactyli slender and contained about three times in 
their propodi, which are sparingly spinulous. 
Sixth abdominal segment twice as long as fifth, and nearly as long as 
the telson. Swimmerets longer than the telson, the outer branch longer 
than the inner. 
Dimensions.—Length of 2 39 mm., length of carapace and rostrum 
15 mm., of rostrum 7 mm, 
Type locality.—Kadiak Island, Alaska, under stones at low water; 
William J. Fisher, collector. 
The abdomen is much longer than in P. vulgaris Say of the Atlantic 
coast of North America, the sixth segment being one third again as long 
as in P. vulgaris with equal carapace; the rostral teeth are fewer, the 
acicle larger, the chelipeds of the second pair more slender. From P. 
varians Leach it differs in its longer rostrum, shorter feet of the second 
pair, in which the relative length of the segments also is quite different. 
Genus Urocaris Stimpson. 
UROCARIS INFRASPINIS Rathbun. 
Urocaris infraspinis RATHBUN, Proc. U.S. Nat. Mus., XXIV, 903, 1902. 
Closely allied to U. longicaudata Stimpson of the West Indian region. 
Carapace and rostrum equal in length to the first three segments and 
half of the fourth segment of the abdomen. Rostrum not reaching 
end of second antennular segment, convex above, armed with 5 to 7 
teeth above, 1 or 2 small teeth below near tip, tip acuminate; behind the 
rostrum a median gastric spine. Suborbital angle blunt. Antennal and 
hepatic spines of good size. Eyes two thirds as long as first antennular 
