156 BULLETIN 201, UNITED STATES NATIONAL MUSEUM 



Third to the eighth thoracic limbs (fig. 58, c) with the carpo- 

 propodus of the endopod divided into three sub joints by transverse 

 sutures, the first sub joint longer than the combined length of the 

 second and third subjoints; third subjoint longer than the second; 

 nail well developed and long, as long as the last subjoint of the 

 carpopropodus. 



Female with three pairs of incubatory lamellae. 



Fourth pleopod of the male (fig. 57, d) with the endopod of seven 

 joints; exopod nearly twice as long as the endopod, 8-jointed, sixth 

 joint with a very long strong plumose seta on its outer distal corner, 

 as long as the combined length of the fourth, fifth, and sixth joints, 

 seventh joint long and narrow, about half as long as the long seta 

 on the sixth joint, with a delicate plumose seta on the outer distal 

 corner as long as the joint; eighth joint very short with a long and a 

 short seta at the apex. 



Sixth abdominal somite one and a quarter times as long as the 

 fifth. 



Telson (fig. 57, /) 1^4 times as long as the sixth abdominal somite 

 and nearly twice as long as broad at the base ; cleft for one-quarter 

 of its length, sides of the cleft armed with about 20 spines, mostly 

 short but the distal 3 or 4 longer and merging into the spines arming 

 the lobes at the apex, lateral margins armed with about 40 to 45 

 long sharp spines extending throughout the entire margin ; the apical 

 lobes of the telson armed with 3 or 4 spines, rather longer than those 

 on the lateral margins but grading into the lateral spines on the one 

 hand and into those arming the cleft on the other. 



Inner uropod (fig. 57, e) 1^4 times as long as the telson, inner 

 margin armed with a continuous row of long spines extending from 

 the statocyst to the apex and gradually increasing in size distally. 



Outer uropod iy s times as long as the inner. 



Length of adult specimens of both sexes 18 mm. 



Type lot.— Two males, 8 females, U.S.N.M. No. 81265, Fish Hawk 

 station 939, east coast of the United States. 



Occurrence. — East coast of United States: Fish Hawk stations 

 869, 4 adult females, 18 mm. ; 878, 1 male, 15 mm. ; 939, 2 males, 8 fe- 

 males, 18 mm. (type lot) ; 1026, 3 females, 17 mm.; 1033, 1 female, 16 

 mm. ; 1035, 19 males, 20 females, 13 to 14 mm., immature; 1038, 1 adult 

 female, 17 mm., 1 immature specimen ; Albatross stations 2091, 1 im- 

 mature specimen, 4 mm. ; 2642, 1 female. 



Distribution. — The species is known only from the above records, 

 which show that it is distributed in the deep water off the east coast 

 of the United States from New England to Florida in 120 to 264 

 fathoms. In suitable conditions it is apparently not rare. 



Remarks. — This species is one of the most interesting species in the 

 collection, and it belongs to a genus of which hitherto only the type 



