388 



Records of the Indian Miiscitui. 



[Vol. XII, 



Port Blair, Andamans. 

 Tanah Merah Besar, 

 Singapore I. 



S. Kemp. 



N. .\nnandale. 



Ten. 

 One. 



Thor discosomatis, sp. nov. 



(Plate xxxvi, fig. i). 



Thor discosomatis is a very close ally of T. paschalis and agrees 

 with that species in the great majority of its structural features. 

 It differs, however, in the following points: — 



Fig. I. — 'f/ior 



Antennule. 

 Antennal scale. 

 First peraeopod. 

 Second peraeopod 



(^iscosoiiiat/s. sp. no\'. 



e. Third peraeopod. 



/. Second pleopod of male. 



g. Telson. 



/;. Apex of telson. 



The rostrum is a little shorter ; at its apex it is sharply point- 

 ed, not bifid, and on its upper margin it bears only two or three 

 teeth. These teeth are larger and all of th.-m are situated on the 

 rostrum in front of the hinder limit of the orbit. The basal seg- 

 ment of the antennular peduncle (text-fig. la) bears a spine on 

 its infero-internal aspect, as in T. paschalis; but the lateral pro- 

 cess, though variable in length, is usually longer than in that 

 species, often reaching the end of the third segment. The process 

 bears, near the proximal end of its outer margin, a sharp upstand- 

 ing tooth of which no trace exists in the allied species. 



