14. nicoRra. 119 
tetragonal and octagonal. Plastron extensively united to the cara- 
pace by suture, with short axillary and inguinal buttresses, just 
reaching the first and fifth costal plates respectively ; entoplastron 
intersected by the humero-pectoral suture. Skull with a bony 
temporal arch; alveolar surfaces without median ridge; choane 
between the eyes. Upper surface of head covered with undivided 
skin, Digits with a short web, or without. Tail short, not longer 
in the young than in the adult. 
East Indies ; Central and South America. 
Skull of Nicoria trijuga. (From Gray, P. Z.S. 1869.) 
Synopsis of the Species. 
I. Carapace tricarinate. 
Anterior and posterior margin of carapace 
strongly serrated ; beak strongly hooked. 1. spengleri, p. 120. 
Borders of carapace not serrated; beak 
more or less distinctly notched........ 2. tryuga, p. 121. 
II. Carapace unicarinate. 
Digits shortly but distinctly webbed ; second 
vertebral shield not or but slightly 
broader than long in the adult ........ 3. punctularia, p. 123. 
Digits very shortly webbed; second ver- 
tebral shield broader than long; a row 
of large scales on the inner front of the 
lower Haltiot the tibia, ~ 2.022290. 66 4. gabbu, p. 126. 
