One (the type species) is said to have been found in the Indo-Gangetic 

 Plain at Calcutta. I think this is likely to be a mistake. 1 know the 

 Potamonidcv of Eastern Bengal fairly well, and the only Calcutta species at all 

 like a Geotelphusa is Paratelphusa {Phricotelphusa) campegtrls. 



d. The subgenus Acanthotelphusa includes eight Indian species and varieties. 

 The type is Potanion {Acanthotelphimt) nilotka (Edw.) from Egypt. Three of 

 the Indian species occur in the Eastern sub- Himalayan region. Six occur in 

 Burma. Two occur in the Indo-Gangetic Plain — in its eastern part. 



2. The genus Paratelphusa. The Indian species of this genus are 

 arranged in six subgenera : Paratelphusa, Barytelphusa, Oziotelphusa (I use 

 Mliller's name for reasons of priority, but in an entirely different sense), 

 Phrkotelphnsa. Liotelphusa, and Globitelphusa. The last three genera are not 

 so sharply separated from one another at all points as could be wished. 



a. The subgenus Paratelphusa. The type of this subgenus is P. tridentatu 

 (Edw.), from the islands of Malaysia. The Indian species are five in number. 

 Two occur in Burma. Two occur in the Eastern sub-Himalayan region. One 

 occurs in the Indo-Gangetic Plain. One aberrant species occurs in Baluchistan. 



No species of the subgenus Paratelphusa has yet been found in the Indian 

 Peninsula. 



b. The subgenus Barytelphusa. The type of this subgenus is the common 

 Indian Paratelphusa {Barytelphusa) jacquemontii (Rathbun) = Telphusa indica 

 (Edw.) ; eighteen Indian species and varieties are included in it. Eight species 

 belong to the Eastern sub-Himalayan region : nine belong to the Peninsula : 

 one species has a wide range in the Indo-Gangetic Plain and extends to the 

 Western Himalayan region at Naini Tal. 



No species of the subgenus Barytelphusa has been found in Burma. 

 No species of the subgenus Barytelphusa has been found in the North- 

 west Frontier region. 



c. The subgenus Oziotelphusa. This subgenus, the type of which is the 

 common Indian Paratelphusa [Oziotelphusa) hydrodromus (Hei'bst) = T. 

 lescheua.udii (Edw.), includes four Indian species and varieties. Three of these 

 occur in the Peninsula. One — a doubtful species — is found in the Eastern 

 sub-Himalayan region. One occurs in the Eastern part of the Indo-Gangetic 

 Plain. 



No species of the subgenus Oziotelphusa is found in Bm'ma. No species 

 is found in the Himalayas or in the North-west Frontier region. 



d. The subgenus Phricotelphusa. The type of this subgenus is Paratelphusa 

 [Phricotelphusa) callianira (de Man), from Mergui. It includes seven Indian 

 species and varieties. Five belong to Burma. One belongs to the Eastern 

 Himalayan region. One belongs to the Indo-Gangetic Plain, near Calcutta ; 

 but only one specimen of this species is known. 



No species of the subgenus Phricotelphusa occurs in the Peninsula. No 



