X40 TESTUDINID^. 



2. Chaibassia theobaldi. 



Chaibassia tricarinata, part., Theob. I, c. 

 theobaldi, Anders. I. c. p. 718. 



Distinguished from the preceding by the very much larger and 

 anteriorly broader first vertebral, the lateral margins of which are 

 widely anteriorly divergent. Facial portion of the head longer and 

 more pointed. Shell black above, almost orange-yellow inferiorly, 

 the dorsal ridges bright yellow ; head black, with a broad reddish 

 band from above each nostril, increasing in breadth as it passes 

 over the eye and over the tympanum, where it ceases ; a narrow 

 similar band below the angle of the mouth, along the inferior 

 margin of the lower jaw ; neck and limbs blackish. 



Length of shell 16 centim. 



Bisthnath Plain, Assam. 



17. CINIXYS. 



Kinixvs, Bell, Tr. Linn. S'oc. xv. p. 398 (1827); War/l. Syst. Amph. 



p. 138 (1830) ; Grmj, Syn. Bept. p. 15 (1831) ; Bum. c^ Bihr. ii. 



p. 159 (1835); Gray, Cat. Tort. y>.ll (1844), and Sh. Bept. i. 



p. 12 (1855) ; Strauch, Chelon. 8tud. p. 24 (1862). 

 Ciuothoras, Fitzing. Ann. Wien. Mus. i. p. 108 (1835). 



Posterior portion of carapace movable in the adult, hinged between 

 the seventh and eighth marginals and the fourth and fifth costal plates. 

 Neural plates hexagonal, short-sided behind. Supracaudal shield 

 undivided. Plastron extensively united to the carapace by suture, 

 with short axillary and inguinal buttresses, which do not reach the 

 costal plates ; entoplastron anterior to the humero-pectoral suture. 

 Skull with a bony temporal arch ; alveolar surface without median 

 ridge ; beak hooked ; choanae between the eyes. Head shielded 

 above. Limbs club-shaped, with blunt claws and large scales. 

 Tail short, not longer in the young than in the adult. 



Tropical Africa. 



Synojisis of the Species. 



I. Anterior and posterior margins of carapace reverted and dentated. 



No nuchal shield ; anterior extremity of 

 plastron projecting beyond the carapace ; 

 posterior part of carapace sloping 1. erosa., p. 141. 



Nuchal present ; anterior extremity of plastron 

 not projecting beyond the carapace ; cara- 

 pace descending vertically behind 2. homenna, p. 143. 



II. Margin of carapace not reverted nor den- 



tated ; nuchal shield present 3. belliana, p. 143. 



