EOr2: | N. ANNANDALE: The Indian Mud-Turtles. 153 
T. phayrei but also separated from that species in Chittagong 
by T. nigricans, in many respects an intermediate form. Very 
little information is as yet available about the exact distribution 
of the South Indian species of Tvzonyx, but we now know that an 
Indo-Gangetic species (T. gangeticus) occurs in the Mahanaddi. 
Both the southern race of Emyda granosa (subsp. vittata) 
and the northern or typical form have been found to be different 
from that which occurs in the Central Provinces and Chota 
Nagpur and inhabits even the valleys of rivers such as the Kasai 
and the Barakar which actually reach the sea through the Hughli 
estuary, south of the Hughli itself. 
The Burmese forms are either endemic or found also in the 
Malay Peninsula, except the monotypic genus C/itva which has 
only been found in the Ganges and the Irrawaddi. Tvrionyx 
formosus is only known from the Irrawaddi, the Salween and the 
Sittang; Emyda granosa scutata only from the valleys of the two 
former rivers, while Dogania subplana and Trionyx cartilagineus 
are typical Malayan forms. T. phayrei, on the other hand, in 
all probability originated in the hills of Arrakan and has made 
its way southwards into the Malay Peninsula and certain islands 
of the Malay Archipelago and eastwards into Indo-China. 
Only one of the Indian Trionychids has a really wide geo- 
graphical range in both the Malayan and Indian sub-regions, 
namely Pelochelys cantoris. ‘This appears to be a somewhat scarce 
species wherever it occurs, although it has been found both 
in the lower reaches of the Ganges and in New Guinea, as well as 
in many intermediate localities. 
In preparing these notes I have not thought it necessary to 
give detailed reference to all the works that have appeared before 
or since the publication of Mr. Boulenger’s volume in the 
“Fauna.” To do so in respect to previous works is needless 
except in a few instances, whereas a full bibliography of recent 
references can be extracted from Dr. &. Siebenrock’s ‘‘ Synopsis 
der rezenten Schildkrdten’’ (Zool. Jahrbucher, Jena, 1909). I 
have referred to this most useful work throughout simply by 
the author’s name with the page number added. 
Genus DOGANIA, Gray (1844). 
Siebenrock, p. 605. 
This genus, which is not recognized by Mr. Boulenger (at 
any rate in the ‘‘ Fauna”’) as distinct from Tyvionyx, has the whole 
series of costal plates separated by neurals, instead of having 
the last pair of costals in contact in the middle line. The plastron * 
is also less fully ossified than in Tvionyx in a restricted sense, 
and the branchial skeleton differs in that the basihyoid bones 
are in close contact in the middle line. 
Only one species, which is widely distributed in Malaysia and 
occurs in the coastal districts of Burma, is known to exist. 
1 Siebenrock, S B. K. Akad. Wiss. Wien, CXI, pp. 817—8, fig. 2, 1902. 
