486 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXV. 



Fig. 4. — Gnathia mtltispinis. 



with a row of three spines, two tubercles, and a bifurcated spine, the 

 latter being the most anterior. 



First segment of thorax partly coalesced with head and -not free, 

 narrower and also much shorter than the following segment; second 



and third segments (the first 

 and second free segments) 

 about equal in length and 

 width, with the lateral margins 

 produced in spines and the dor- 

 sal surface covered with small 

 spines and tubercles; fourth 

 segment (third free segment) 

 longest, with the lateral mar- 

 gins drawn out anteriorly and 

 posteriorly in spines and the 

 dorsal surface covered with 

 small spines and tubercles ; fifth 

 segment (fourth free segment) 

 not quite as long as the preced- 

 ing, with the dorsal surface di- 

 vided up into areas, these areas 

 being covered with small spines 

 and tubercles; sixth segment 

 (fifth free segment) almost as long as the fourth (third free segment), 

 with the dorsal surface also divided up into areas, which are beset with 

 small spines and tubercles; seventh segment (sixth free segment) ex- 

 ceedingly short, only about half as long as the abdominal segments and 

 not quite as wide, produced on its posterior 

 margin in spines. 



First live abdominal segments about equal in 

 length and width, produced laterally in trian- 

 gular processes and spines, with the posterior 

 margins also produced in spines. The last seg- 

 ment with the uropoda is lost in the only speci- 

 men. 



All five ambulatory legs are beset with spines 

 in rows. First pair of legs, or gnathopods, com- 

 posed of three articles, a large basal article, a Fig. 5.— gnathia 

 small middle article, and a minute terminal joint. 



Only one specimen, a male, was collected at Albatross Station 

 2231, off Delaware, taken at a depth of 965 fathoms. 

 Type. Cat. No. 38973, U.S.N.M. 



This species is very similar to Gnathia cristata (Hansen)" but dif- 

 fers from that form in not having the front of the head produced 



" Vidensk. Meddel. Naturh. Foren i. Kjthenli.. 1887-88, p. 182, pi. \n. Bgs. '2- 

 2a. Sec also Richardson, Bull. r. S. Nat. Mas.. No. 54, L905, pp. 56-57. 



.Mii/n- 

 Mandible. 



