0, DAIIONIA, 93 



Sijnoj^sis of the Species. 



I. Carapace tricaniiatc. 



A. Axillary and inguinal shields present. 



Keels interrupted, formed of a nodose promi- 

 nence on each of the vertebral and costal 

 shields 1. hamiltonii, p. 93. 



Keels continuous, the laterals not extending 



to the fourth costal sliields 2, suhiriJKr/a, p. !)l. 



Keels continuous, the laterals extending to 



the fourth costal 3. reevesii, p. 95. 



B. AxiUary shield absent, inguinal minute; 



lateral keels very feeble 4. onutica, p. 96. 



II. Carapace unicarinatc 5. nigricans, p. 07. 



1. Damonia hamiltonii. 



Emys hamiltonii, Grm/, Si/n. Rept. pp. 21,72 (1831); Dum.S^- Bihr. 



ii. p. 31o (18;3o); Gray, Cat. Tort. p. 19 (1844); Giinth. liept. 



Brit. Ind.Y>. 32 (18(!4) ; Anders. Proc. Zool. Soc. 187(), p. 7")1. 

 picquotii, Les^. Bidl. Sc. Nat. xxy. p. 120 (Idol), (oid in 



Belamj. Voij. Ind. Or., Zool. p. 294 (1884). 



guttata {lion Schn.), Gray, III. Ind. Zool. i. pi. Ixxvi. fig. 1 



Geoclemmys hamiltonii. Gray, Cat. Sh. liept. i. p. 17 (1855). 



Clemmys hamiltonii, Strauch, Chelon. Stud. p. .32 (1802). 



Damonia hamiltonii, Grai/, Proc. Zool. Soc. 1809, p. 195, and Snppl. 



Cat. Sh. Bept. i. p. 43 (1870) ; Theoh. Cat. Bejjt. Brit. Ind. p. 11 



(1870). 

 Melauochelys pictus, Murray, Ann. iSf Mar/. N. II. (5) xiv. p. 107 



(1884). 

 Clemmys palfcindica, Lydekkcr, Pal. Ind. (10) iii. p. 178, pi. xxi. 



figs, i & 3 (1885). 



Carapace much elevated, with three interrupted keels or scries 

 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 thii'd vertebrals broader than long in the young, 

 nearly as long as broad in the adult, narrower than the costals. 

 Plastron large, angulatcd 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 

 humcrals, the shortest those between the humerals and between 

 the anals. Head rather large ; snout very short, not projecting ; 

 upper jaw cmarginate 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 



