50 TESTU DINID 2%. 
2. Alveolar surface of upper Jaw without median ridge. 
a. Choane behind the level of the eyes; alveolar surface of 
jaws very broad. 
Inguinal buttress anchylosed to the fifth costal plate; upper surface 
of head covered with undivided skin; entoplastron anterior to 
the humero-pector al suture...... 8. Malacoclemmys, p. 88. 
Inguinal buttress anchylosed between the fifth and sixth (excep- 
tionally fourth and fifth) costal plates; hinder part of head 
covered with small shields ; entoplastron intersected by the humero- 
pectoral-SWoULe).. be es oe aie e 9. Damonia, p. 92. 
b. Choanze between the eyes; entoplastron intersected by 
the humero-pectoral suture. 
a. Plastron not hinged. 
Axillary and inguinal buttresses strong, latter anchylosed between 
the fifth and sixth costal plates; hinder part of head covered 
Wath smialleshteldsy sc. sate. sos ceee 10; Bellia, p97: 
Axillary and inguinal buttresses short, latter just reaching the fifth 
costal plate; upper surface of head with undivided skin. 
11. Clemmys, p. 100. 
B. Plastron hinged, movable. 
A bony temporal arch; beak not hooked. 
12. Emys, p. 111. 
No bony temporal arch ; beak hooked. 
13. Cistudo, p. 114. 
B. Hexagonal neural plates (at least the anterior) short-sided 
behind; entoplastron intersected by the humero-pectoral 
suture. 
Plastron not hinged ; a bony temporal arch. 
14. Nicoria, p. 118. 
Plastron hinged, movable ; a bony temporal arch. 
15. Cyclemys, p. 128. 
Plastron not hinged ; no bony temporal arch. 
16. Geoemyda, p. 135. 
II. Digits without a rudiment of web, with not more than two 
phalanges ; metacarpals not or but slightly longer than broad ; 
neural plates mostly hexagonal, short-sided behind, or alter- 
nately tetragonal and octagonal. 
A. Alveolar surface of upper jaw without a median ridge. 
Posterior portion of carapace hinged, movable. 
17. Cinixys, p. 140. 
