442 Journal of the Asiatic Society of Bengal. [N.S., XIX, 
Hills in Burma, is represented in the collection by a single 
small female. 
Compared with typical specimens from Nepal, this indivi- 
dual differs slightly (i) in the more deeply incised grooves of 
the upper surface of the carapace, the cervical in particular 
being very deeply impressed, (ii) in the stronger rugae on the 
anterior and antero-lateral parts of this surface, and (iii) in the 
less conspicuous epibranchial tooth. The merus of the third 
maxilliped is proportionately a little longer than in typical 
specimens, though still evidently broader than long. 
The specimen agrees more nearly with the typical form 
than with any of the varieties described by Alcock. the 
example from the Shan Hills (the only individual known from 
Burma) the grooves of the carapace are more superficial than 
in normal specimens, whereas in that in the present collection 
they are much deeper. 
The carapace is 21-8 mm. in greatest breadth, 16'S mm. 
in length and 9°3 mm. in h. 
The specimen was obtained at Tengyueh, the Treaty Port 
on the road from Bhamo to Tali-fu, east of the Chinese 
frontier ; altitude, 5,300 feet, “on the floor of a basin with 
rice-fields, amid hills of basalts and other volcanic rocks: 
collected during the rainy season in August.”’ 
Potamon (Potamiscus) yunnanense, sp. nov. 
(Plate XVIII.) 
orbital crests. The mesogastric areola is narrow, little more 
than a quarter the greatest breadth of the carapace; its 
separated by a smooth interval from the upturned antero- 
