Indian Deep-sea Dredging. 187 



Branch Aktheopoda. 

 Class CRUSTACEA. 



Of this class fifty-three species were obtained, of which 

 fifty-one belong to the Malacostraca, and two to the Entomo- 

 straca. 



Grade MALACOSTRACA. 



Amongst the fifty-one species belonging to this subclass 

 every order except Amphipoda and Cumacea is represented, 

 as follows : — 



Order SCHIZOPODA. 



Family Lophogastridse. 



Gnathophausia, Suhm. 



At Stations 100 and 102, at 840 and 920 to 690 fathoms 

 respectively, two fine specimens were obtained. They are of 

 the usual uniform deep lake-colour, and they represent the two 

 sections into which Sars has divided this genus. 



1- Gnathophausia Sarsii, sp. n., Wood-Mason. 



Belongs to the second section of the genus, in which it 

 is nearest allied to Gnathophausia Willemoesii. The carapace 

 covers the basal third of the first abdominal somite and has 

 its dorsal spine produced as far as the posterior end of the 

 third abdominal tergum ; its extreme edge is expanded at the 

 postero-inferior angle into a conspicuous rectangular lamina, 

 into which neither its low r er lateral keel nor its raised rim 

 enters. The rostrum, which has lost its tip, appears to have 

 been of the same form and proportions. Ocular and antennal 

 spines well developed, divergent ; the former are slightly 

 curved and rather longer and slenderer than the latter. There 

 are no branchiostegal spines. The upper half of the posterior 

 margin of the carapace on each side and the lateral edges of 

 the dorsal spine are minutely denticulated. Each of the five 

 anterior abdominal terga has a dorsal keel produced poste- 

 riorly into a short sharp spine, and two subdorsal keels, and 

 the posterior lobes of the pleura acuminate. The telson is 

 tricarinate, having a fine median carina in addition to the 

 much coarser sublateral ones, and appears to be more pro- 

 duced at the tip than in any other species. 



Length from tip of rostrum to apex of telson 75 millim. 



13* 



