﻿232 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 102 



Right mandible with 10 or 11 teeth in cutting plate; no accessory 

 plate; molar conical with very small triturating surface; 12 spines 

 in spine-row; palp with third joint slightly longer than second and 

 not apically produced. Maxilla 1 : Inner plate small with one plumose 

 apical seta ; outer plate with nine spine-teeth ; palp with eight apical 

 spines, and three submarginal setae on the outer surface. IMaxilla 2 : 

 Inner plate with one long plumose seta on inner margin. Maxilliped : 

 Inner plate reaching to the base of the first joint of palp, armed distally 

 with four or five very short spine-teeth and two slender spines, and on 

 the inner margin with one long spine; outer plate reaching a little 

 beyond the base of the second joint of palp, armed on inner edge with 

 eight slender submarginal spine-teeth and on the outer surface with 

 six small submarginal spinules; palp with first three joints subequal 

 in length. 



First four coxal plates a little deeper than their respective body seg- 

 ments. Gnathopocl 1 as shown in fig. 83, F ; sixth joint with palm 

 oblique, convex, armed with a row of submarginal spinules, and defined 

 by two spines, below which on the hind margin of joint is another pair 

 of spines ; seventh joint fitting palm. Gnathopod 2, like gnathopod 1, 

 but a little longer. Peraeopods 1 and 2 alike; sixth joint strongly 

 developed, hind margin armed with seven pairs of stout spines against 

 the distal four of which the seventh joint closes, forming a grasping 

 organ. Peraeopods 3 to 5 are alike, but the fourth is somewhat the 

 longest; second joint well expanded; sixth joint strongly developed 

 and armed on the front margin with groups of stout spines, which to- 

 gether with the seventh joint form an effective grasping organ. 



The lower posterior angle of the metasome segments minutely and 

 sharply produced. Uropods as shown by Sars for Stenopleustes 

 mahngreni (Crustacea of Norway, 1893, vol. 1, pi. 125, fig. 1) except 

 that the outer ramus of uropod 3 is proportionately shorter in Sars' 

 figure. Uropod 1 reaching a little farther back than uropod 2. 

 Uropod 3 reaching back about as far as uropod 2. Telson reaching to 

 the distal end of peduncle of uropod 3, three-fourths as wide as long 

 with the convex sides converging to the evenly rounding extremity. 

 Length from front of head to end of uropods 6.5 mm. 



Type. — A female, U.S.N.M. No. 86260, taken from the pleopods of a 

 spiny lohst&r Panulirus interruptus, from Santa Barbara, Calif., Janu- 

 ary 22, 1948, by E. F. Ricketts. 



