3^8 

 I. Trionyx hurum Gray. 



Trionyx hiiriim^ Gray, Syn. Rept. 1 83 1, p. 47, pi. X. 

 Trionyx hurum^ Boulenger, Cat. Chel. 1889, P- 249 (s. syn.). 

 Trionyx Jiurutn^ Siebenrock, Zool. Jahrb. Suppl. X 1909, p. 597- 

 Trionyx hnrum^ Annandale, Rec. Ind. Mus. VII part II 1912, p. 160. 



Disk as long as broad or a little more long than broad; two 

 neurals between the first pair of costals; last pair of costals 

 forming a suture; eight pair of costals; plates vermiculate. Young 

 specimens with numerous longitudinal ridges of tubercles on 

 the dorsal skin. Epiplastra narrowly separated; entoplastron 

 forming an obtuse or a straight angle; callosities coarsely pitted 

 and vermiculate, large, hyo- and hypoplastral, xiphiplastral and 

 entoplastral in old specimens. Head moderate; snout a little 

 longer than the diameter of the orbit; interorbital space broader 

 than the nasal fossa; postorbital arch a little more than half 

 the diameter of the orbit; mandibular symphysis flat or with 

 a longitudinal groove, no ridge. Tail very short. Limbs with 

 three claws. 



Olive-brown above and beneath; head, neck, limbs and border 

 of disk with light dots; some large yellow spots on the head: 

 one across the snout, behind the eye, at the corner of the 

 mouth and on the chin, becoming indistinct with age. Young 

 specimens have four to six large ocelli on the disk, which is 

 marbled with dark. Length of disk 409 mm. (Not seen by me). 



Habitat: Borneo (Santubong on Sarawak river')). — 

 Malay Peninsula?; Penang?; Bengal; Indo-China. 



2. Trionyx phayrei Theob. 



Trionyx phayrei^ Theobald, Journ. Linn. Soc. X 1868, p. 18. 

 Trionyx phayrii^ Boulenger, Cat. Chel. 1889, p. 251 (s. syn.). 

 Trionyx phayrei^ Siebenrock, Zool. Jahrb. Suppl. X 1909, p. 598. 

 Trionyx phayrei^ Annandale, Rec. Ind. Mus. VII part II 1912, p. 165. 



A single neural between the first pair of costals; eight pair 

 of costals, the last forming a suture; plates coarse and ver- 

 miculate. Epiplastra in contact in front of the entoplastron, 

 which forms an obtuse or straight angle; callosities feebly 

 developed, slightly sculptured. Head moderate; snout a little 

 longer than the diameter of the orbit; postorbital arch not 

 quite one third the diameter of the orbit; mandibular symphysis 



I) See Shelford, J. Straits Br. Asiat. Soc. XXXV 1901, p. 46. 



