44 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



The first pair of antenna? have the first joint of the peduncle long, 

 the inner lateral margin of which is armed with three long spines and 

 one small one; the outer margin, with one large spine near the apex. 

 The second joint is one-third the length of the first joint and is 

 unarmed. The third joint is one-half as long as the second joint. 

 The flagellum is composed of about fourteen joints; the secondary 

 appendage of about seven joints. The peduncle of the second pair of 

 antennae extends to the end of the first joint of the peduncle of the 

 first pair, and has an exopod developed at the base of the third joint. 

 The flagellum is composed of about ten joints, and extends about half 

 the length of the flagellum of the first pair of antennae. There is a 

 prominent spine on the epistome. 



The first free segment of the thorax is shortest, the two following 

 ones being longer, the next two the longest, and the last but little 

 longer than the first. The first segment is as wide as the head, the 

 others decrease in width gradually. The antero-lateral margins of 

 all the segments except the first are produced into one acute process, 

 of the fourth and fifth free segments into two acute processes. The 

 last segment bears a ventral spine. 



The abdominal segments gradually decrease in width backward. 

 The sixth or terminal segment is produced on either side near the base 

 into two acute processes. Beyond the last process the segment widens 

 slightly for the attachment of the uropoda, and ends posteriorly in a 

 triangular process. The uropoda are very long, the inner branch being 

 half the length of the body, and composed of about twenty-five joints. 

 The outer branch is composed of seven joints. 



First gnathopods with the upper distal margin of the propodus, 

 finely serrate and armed with a tooth near the articulation of the 

 dactylus. Second gnathopods have the merus armed with one spine at 

 the distal extremity on the posteri or margin, and one on the anterior 

 margin; the carpus armed with two spines on the posterior and one on 

 the anterior margin at the distal extremity; the margin of the propodus 

 armed with three spines on the posterior margin, and one large spine 

 and one small one at the distal extremity on the anterior margin. The 

 dactylus is serrate on the inner margin. Exopods are present on both 

 first and second gnathopods. The other legs are beset with spines. 



The specimen is a female and has a large marsupium filled with eggs, 

 extending the length of the first four free segments of the thorax. 



Only one individual was collected by Prof. A. E. Verrill and party, 

 in Harrington Sound, Bermudas. 



Type specimen in Peabody Museum, Yale University. Cat. No. 3192. 



