388 Records of the Indian Museum. [VoL. XII, 
95638 Port Blair, Andamans. S. Kemp. Ten. 
10 — 
9564 Tanah Merah Besar, N. Annandale. One. 
Singapore I. 
Thor discosomatis, sp. nov. 
(Plate xxxvi, fig. 1). 
Thor discosomatis is a very close ally of T. faschalis and agrees 
with that species in the great majority of its structural features. 
It differs, however, in the following points :— 
ae 

Fic. 1.—Thor discosomatis, sp. nov. 
a. Antennule. e. Third peraeopod. 
b. Antennal scale. 7. Second pleopod of male. 
c. First peraeopod. g. Telson. 
d, Second peraeopod. h. 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 ali of them are situated on the 
rostrum in front of the hinder limit of the orbit. The basal seg- 
ment of the antennular peduncle (text-fig. Ia) bears a spine on 
its infero-internal aspect, as in T. aschalis; 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. 
