SIWALIK AND NARBADA CHELONIA. 
33—187 
A. A nuchal plate. 
a. ‘ith vertebral plate much longer than broad.^ and narrovjer than ^rd. 
1. B. kachugaI (Gray Hamilton, MS.]). First three vertebral plates rather broader 
than long; 1st hexagonal, broadest anteriorly; 3rd very short and broad; nuchal 
broad and triangular ; vertebrals keeled in young ; suture between postgulars and 
pectorals forms an obtuse angle. Hab. Bengal, Nipal, Pegu, Tenasserim, etc. 
2. B. ELLIOTT, Gray. Only known by the young ; and Mr. Theobald suggests it may be 
the same as B. kachuga. Nuchal plate broad and triangular; 4th vertebrals probably 
elongate in adult ; vertebrals keeled in young ; suture between postgulars and pectorals 
forms an obtuse angle. Hab. Kistna and (.?) Jamna rivers. 
3. B. dhongoka, Gray {ex B. Hamilton, MS.). 1st and 2nd vertebrals elongate, the 3rd 
short and broad ; nuchal triangular ; suture between postgulars and pectorals straight ; 
vertebrals keeled. Hab. Greater part of Central and Upper India. 
4. B. trivittatus (Dumdril and Bibron). 1st vertebral nearly square, the 3rd short and 
broad ; suture between postgulars and pectorals straight ; vertebrals keeled in young. 
Hab. Pegu and Tenasserim. 
b. 4:th vertebral plate as broad as long, and of equal width with the ^rd. 
5. B. THURGi (Gray). 1st vertebral elongate, narrower in front than behind; 4th 
hexagonal ; nuchal triangular and narrow ; vertebrals keeled ; suture between post- 
gulars and pectorals straight ; plastron rounded in adult. Hab. Bengal, Indus river, etc. 
6. B. BASRA, Gray. First four vertebrals nearly square ; nuchal subquadrangular, broader 
than long ; suture between postgulars and pectorals forming a very obtuse angle ; 
vertebrals keeled in young. Hab. Pegu, Tenasserim, Malay Peninsula, Bengal, etc.; 
generally estuarine. 
B. No nuchal plate. 
7. B. AFFiNis (Cantor). First four vertebrals of nearly equal length, 1st and' 2nd broader 
than long, 4 th longer than broad; suture between postgulars and pectorals forming a 
very obtuse angle ; an uninterrupted vertebral, and an interrupted costal keel in young. 
Hab. Malay Peninsula, and perhaps Tenasserim. 
8. B. PiCTUS (Gray). Described from a half-grown specimen. 1st vertebral four-sided 
rather longer than broad ; 2nd, 3rd, and 4th hexagonal, 2nd and 3rd as long as broad, 
4th rather longer than broad ; traces of a vertebral keel in young. Hab. Borneo. 
Species 1. Batagur falconeri, n. sp. nobis. 
(Allied to Batagur thurgi [Grray.]) 
Type specimen . — The type specimen of this form is figured of one-fourth the 
natural size in plate XXIII. figs. I. la, and pi. XXIV. fig. 4 ; it is in the Cautley 
collection of the British Museum, and was obtained from the Siwalik Hills. It 
comprises the greater portion of the shell, the carapace having been crushed in on 
the left side, and its posterior margin broken off, while the plastron has lost its 
anterior and posterior extremities. The boundaries of all the plastral plates are 
shown ; and the carapace exhibits the form both of the vertebral horny plates and 
bony scutes. * The general contour and structure of the specimen, which when 
perfect was about 20 inches in length, leaves no doubt that it belongs to the present 
1 The so-called B.fuscus, Gray, agrees with this species in all the characters available in the case of fossils. 
I 
