DECAPODS 31 



Antennal scale as long or nearlj^ 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 $ 39 mm., length of carapace and rostrum 

 15 mm., of rostrum 7 mm. 



Type locality . — Y^^.6!\zk. 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. longicaudaia 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, i 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 



