152 Records of the Indian Museum. (VoL. Vi, 
2. Trionyx gangeticus, Cuvier. The river-systems of the Indus, 
the Ganges and the Maha- 
naddi. 
2 » ~ leithii, Gray. .. The rivers of western, central, 
and northern India. 
4. ,,  hurum, Gray. .. The lower reaches of the Ganges; 
the Brahmaputra as far east 
as its entry on the plains. 
nigricans, Anderson. Chittagong. 
J: ? 
6. ,,  formosus, Gray. .. The Irrawaddi, the Sittang and 
the Salween. 
a. ,,  phayrei, Theobald. Arrakan, Pegu, Tenasserim, the 
Malay Peninsula, Sumatra, 
Java, and Borneo. 
8. cartilagineus Pegu, Tenasserim, Siam, Cam- 
(Boddaert). bodia, the Malay Peninsula, 
Sumatra, Borneo and Java. 
9. Pelochelys cantoris (Gray). The lower Ganges system, 
Burma, the Malay Peninsula, 
Annam, S. China, Borneo, 
Sumatra, the Philippines and 
New Guinea. 
ro. Chitra indica (Gray). .. The Ganges and Irrawaddi sys- 
tem, as far as the base of the 
Himalayas in the former. 
11. Emyda granosa (Schoepff). | The valleys of the Indus and the 
Ganges; the Arrakan Coast. 
EUs oe ‘ intermedia, » Chota Nagpur; the Central Pro- 
nov. : vinees; Orissa and the north- 
east of the Madras Presidency. 
epost ne vittata, The greater part of the Bombay 
Peters. Presidency (including Cutch) ; 
the whole of the Madras 
Presidency except the north- 
eastern part ; Travancore. 
TICMIee 4 ceylonensis, Pine oF Cevlan 
Gray. ; 
TTS. a scutata, 2 The valleys of the Irrawaddi 
Peters. § and the Salween. 
From the above list it will be seen that the Trionychids of 
the Indian Empire fall naturally into three groups, if considered 
from a geographical point of view:—(1) those of the Indo- 
Gangetic and Brahmaputra river-systems; (2) those of the valleys 
of the rivers of Peninsular India, and (3) those of Burma. 
The exact limits of these areas are, however, not strictly 
observed, for while the typical form of Emyda granosa, a charac- 
teristic Indo-Gangetic race, ranges in a south-easterly direction as 
far as the Arrakan Coast, the common Indo-Gangetic Trionyx 
(T. gangeticus) is apparently not only replaced in Arrakan by 
