MUSEUM OF COMPARATIVE ZOOLOGY. 37 



length of the distal segment, which is a little longer than the penultimate, but 

 only a little more than two thirds as long as the antepenultimate, while the 

 two distal segments together are about as long as the antenna! scale. 



The anterior thoracic legs are very slender, reach a little beyond the tips of 

 the antennal scales, and the chela itself is smooth, naked, strongly compressed 

 distally, a little shorter than the antennal scale, about as long as the diameter 

 of the carapax, and, excluding the very prominent distal spine of the inner 

 margin, about a fourth as wide as long. The second legs are very small, as 

 in the other species of the genus, slender, and scarcely reach the middle of 

 the meri of the anterior pair. The third are very slender, about twice as 

 long as the carapax, reach by the tips of the antennal scales the full length of 

 the propodi and dactyli, which taken together are very nearly as long as the 

 carpi, the dactyli being very slender and acute and about half as long as the 

 propodi. The fourth and fifth legs are about as long as the first pair, and 

 sparsely clothed with long hairs except upon the dactyli, which are strongly 

 compressed vertically, about two thirds as long, and toward the base as broad, 

 as the propodi. 



The abdomen to the tip of the telson is about three times as long as, and 

 slightly narrower than, the carapax. The sixth somite is more than a fifth of 

 the entire length, compressed laterally so that the breadth is less than a fourth 

 while the height is fully two fifths of the length, and flattened or obscurely 

 channelled longitudinally in the middle of its length above. The telson is 

 about as long as the sixth somite, very slender, flattened but scarcely channelled 

 above, and the narrow tip armed with four very slender spines of which the 

 median are twice as long as the lateral. The inner lamella of the uropod 

 is as long as the sixth somite, projects considerably by the tip of the telson, is 

 lanceolate, and more than five times as long as broad. The outer lamella is 

 considerally shorter and slightly broader than the inner. 



The inner lamella of the appendage of the first abdominal somite (PL VII. 

 fig. 2 b ) is about as long as the protopod, linear, and the margins not ciliated ; 

 the outer lamella is narrow-ovate, considerably longer than the inner, and of 

 the usual structure. The inner lamella of the appendage of the second somite 

 (Til,'. 2") is a little shorter and much narrower than the outer, and has a single 

 stylet two fifths as long as itself arising from the inner margin near the I 



Length from tip of rostrum to tip of telson 30.0mm. 



Length of carapax including rostrum 7.8 



Length of rostrum ......... 1.7 



Greatest breadth of carapax ....... -4.1 



Length of antennal scale 4.5 



Breadth of antennal scale 1.1 



Greatest diameter of eye 14 



Length of sixth somite of abdomen 4 



Length of telson 5.0 



Station 315, N. Lat. 32° IS' 20", W. Long. 76° 43' ; 22.". fathoms. 



