135 



creasing in length posteriorly. First pair of gnathopoJa having the 

 meros broad distally j carpus broad, antero-inferiorly produced nearly to 

 the apex of the propodos ; the apex of the produced portion obtuse, 

 finely serrulated on both margins j propodos oblong-ovate, slightly long- 

 er than the produced angle of the carpus, inferior margin serrulated ; 

 dactylus short. Second pair of gnathopoda longer than the first; carpus 

 produced inferiorly, but not anteriorly; antero-inferior angle obliquely 

 rounded and sharply serrated; propodos longer than the carpus, the 

 superior margin arcuate, inferiorly straight, not serrated; dacty- 

 lus half the length of propodos, slender, arcuate. First and second 

 pairs of thoracic feet long, all the joints following the coxae closely 

 serrated along their flexible margins; claws long, slender, acute, almost 

 as long as the preceding joint. Third pair having coxa dilated, and 

 anterior margin nearly straight, the posterior broadly convex; the 

 remaining joints, resembling the corresponding joints of the first and 

 second pairs, longer than the coxa, and articulating with its apex near 

 the anterior angle. Fourth pair having the coxa more dilated than 

 the third, form similar; the remaining joints shorter than the coxa, but 

 -with the flexible margins serrated like the preceding pairs ; the coxa of 

 the fifth pair broad, much smaller than the two preceding; ischium ru- 

 dimentary; the remaining joints obsolete. Segments of the abdomen 

 much longer than those of the thorax, decreasing in length and breadth 

 posteriorly ; the posterior lateral angles of the three anterior segments 

 produced, acute ; the fourth and fifth segments do not coalesce ; the fifth 

 is extremely abbreviated, but distinct ; on account of its small size the 

 antepenultimate and penultimate caudal lamellae appear to rise together 

 from the postero-inferior angle of the fourth segment, but in reality 

 they do not; the penultimate pair rises from the fifth; these lamellae 

 are subequal, with peduncles short and rami long, extending almost to 

 the extremity of the ultimate pair, ovate-lanceolate, acutely serrated on 

 both margins; peduncles of ultimate pair very short, rami similar to the 

 preceding, extending a short distance beyond the extremity of the tel- 

 6on. The latter triangular, apex obtuse. 



Length, .15 of an inch. 



Locality' : North Pacific Ocean. Latitude 21° north ; longitude lol^ 

 west. Collected May 20, 1873. 



