4IO 



CHELONIA 



CHAP. 



Hudson river ; but it is not found in any other Atlantic stream 

 between that and the Savannah river, a distance of nearly 800 

 miles." 



T. triunguis, the only African species, ranging from the 

 Senegal and Congo into the Nile-system, Ijut occurring also in 

 Syria, is perhaps the largest of all Trionychidae, reaching a 

 shell -length of almost 3 feet. The adults are olive-brownish 



Fig. 93. — Trionyx gangeticus (young). 



X 3. 



above, the throat and under parts of the shell with round, white 

 spots separated by a dark network. The young have whitish 

 specks and spots. 



T. gangeticus and T. hurum are the principal Indian species. 

 The former is the larger of the two, with a shell of more than 2 

 feet in length ; olive above, the young with fine black vermicula- 

 tions ; head witli a black longitudinal streak from between the 

 eyes to the nape, intersected by two or three chevron-shaped black 

 streaks ; under parts yellowish. T. h^irum is olive brown above 



