9, DAMONTA, 93 
Synopsis of the Species, 
I. Carapace tricarinate. 
A. Axillary and inguinal shields present. 
Keels interrupted, formed of a nodose promi- 
nence on each of the vertebral and costal 
phieldaven gee mise elke Ue ahs ante cal to lhe 1. hamiltonii, p. 93. 
Keels continuous, the laterals not extending 
to the fourth costal shields ............ 2. subtrijuga, p. 94. 
Keels continuous, the laterals extending to 
thestounth: costaly.). 2.7.2). acces iotieerets 3. reevesti, p. 95. 
B. Axillary shield absent, inguinal minute; 
lateral keels very feeble .......... 4, mutica, p. 96. 
iit Carapace unicarimate.. -. 4s. sscce. 5. nigricans, p. 97. 
1. Damonia hamiltonii. 
Emys hamiltonii, Gray, Syn. Rept. pp. 21,72 (1851); Dum. § Bibr. 
li. p. 315 (1835); Gray, Cat. Tort. p. 19 (1844); Giinth. Rept. 
Brit. Ind. p. 32 (1864) ; Anders. Proc. Zool, Soe. 1876, p. 751. 
picquoti, Less. Bull. Se. Nat. xxv. p. 120 (1851), and in 
Bélang. Voy. Ind. Or., Zool. p. 294 (1854). 
euttata (non Schn.), Gray, Ill. Ind. Zool. i. pl. 1xxvi. fig. 1 
(1832). 
Geoclemmys hamiltonii, Gray, Cat. Sh. Rept. i. p. 17 (1855). 
Clemmys hamiltonii, Strauch, Chelon. Stud. p. 82 (1862). 
Damonia hamiltonii, Gray, Proc. Zool, Soc. 1869, p. 195, and Suppl. 
Cat. Sh. Rept. i. p. 43 (1870) ;. Theob. Cat. Rept. Brit. Ind. p. 11 
(1876). 
Melanochelys pictus, Murray, Ann. § Mag. N. H. (5) xiv. p. 107 
(1884). 
Clemmys paleeindica, Lydekker, Pal. Ind. (10) ui. p. 178, pl. xxi. 
figs. 1 & 3 (1885). 
Carapace much elevated, with three interrupted keels or series 
of nodose prominences corresponding with the vertebral and costal 
shields ; posterior border strongly serrated in the young, feebly in 
the adult; nuchal moderate, broader posteriorly than anteriorly ; 
first vertebral not or scarcely broader anteriorly than _poste- 
riorly ; second and third vertebrals broader than long in the young, 
nearly as long as broad in the adult, narrower than the costals. 
Plastron large, angulated laterally, truncate anteriorly ; posterior 
lobe much narrower than the opening of the shell, nearly as long 
as the width of the bridge, deeply notched posteriorly ; the longest 
median sutures are those between the abdominals and between the 
humerals, the shortest those between the humerals and between 
the anals. Head rather large; snout very short, not projecting ; 
upper jaw emarginate mesially ; the width of the mandible at the 
symphysis nearly equals the horizontal diameter of the orbit; a 
large shield, sometimes divided into three, covers the upper surface 
