32/ 



Olive-brown or yellowish above, sometimes dotted with 

 dark brown. Young specimens with a black vertebral band 

 and about 6 small ocelli; a black line from snout to temples, 

 passing through the eye; an A-shaped black line on the occiput, 

 with a median line in the posterior part. Lower parts yellowish. 

 Length of disk 250 mm. 



Nom. indig. Kuja (W. Java). 



Habitat: Sumatra (Deli ! , Gunung Sugei, Padang 1 500 — 3000 

 feet. Taluk!, Gunung Sahilan!, Tandjong river in BatuBahra); 

 Singkep Island; Gr. Natuna Island; Borneo! (Kapuas river, Ba- 

 ram river, Kuching, Bongon, Saiap on Kina Balu) ; Java (Batavia, 

 Buitenzorg, Sukabumi!, Malang!). — Malay Peninsula; Penang; 

 Singapore; Tenasserim; Mergui Archipelago; Philippines. 



2. Trionyx Geoffroy. 



(Geoffroy, Ann. Mus. Paris XIV p. i, 1809). 



Orbits nearer the temporal than the nasal fossa; postorbital 

 arch flat exteriorly, narrower than the diameter of the orbit; 

 bony choanae between the orbits; jaws strong. Seven or eight 

 neurals in an uninterrupted series; last pair of costals forming a 

 suture. Plastral callosities well developed, 2 — /; a median 

 continuation of the hypoplastron present. Eggs round, hard- 

 shelled. 



Distribution. Africa; Asia; N. America. 



Key to the Indo-Australian species. 



A. Two neural plates between the first pair of costals; 



plastral callosities very large l. T. hurum p. 328. 



B. A single neural plate between the first pair of 

 costals. 



I. A strong longitudinal ridge on the alveolar sur- 

 face of the mandibular symphysis. 



a. Plastral callosities feebly developed, finely 



sculptured 2. T. phayrci p. 328. 



b. Plastal callosities well developed, deeply 



sculptured 3. T. cartilagineus p. 329. 



II. No longitudinal ridge on the mandibular sym- 

 physis ; plastral callosities well developed .... 4. T. sinensis p. 330. 



