327 



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. 



N o m. i n d i g. Kuja (W. Java). 



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

 feet, Taluk!, Gunung Sahilan!, Tandjong river in Batu Bahra); 

 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 Geofifroy. 

 (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 I. T. hurum p. 3 2 &- 



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. p/iayrei 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. 



