137 



None of the rays thickened, but in males the anterior part 

 of the anal is sometimes enveloped by a swollen fold of the skin, 

 which seems to be an outgrowth of the genital papilla. Pectorals 

 inserted high and rather far backwards behind the branchial 

 opening. Ventrals small. Caudal rounded. Scales moderate, 

 rather deciduous. Lateral line running low down, indistinct. 

 Short gillrakers present. Third upper pharyngeals ankylosed. 

 Viviparous. 



Distribution: River Hooghly in British India, Siam, Malay 

 Peninsula, Sumatra, Borneo, Java, Celebes, Philippines. 



In fresh water. 



Key to the indo-australian species of 

 Dermogenys. 



I, Base of ventrals a little nearer to head than to caudal. 

 ./. Length of lower jaw beyond extremity of upper 



jaw 5.4 — 6.1 in length. D. 9 — 10. 



1. A. 15 — 16. L.l. 45 — 47 D. orientalis p. 137. 



2. A. 17 — 19. L.l. about 50 D. wcberi p. 138. 



B. Length of lower jaw beyond extremity of upper 



jaw 7.6 — 8.4 in length. D. lo — 12. L.l. 54. . . D. cbrardti p. 139. 



II. Base of ventrals midway between head and caudal. 



A. 15 D. suinatraniis p. 139. 



III. Base of ventrals nearer to caudal than to head. A. 14. D. pusillus p. 140. 



I. Dermogenys orientalis (M. Web.) [Fig. 52, p. 136]. 



Heniiramphiis orientalis Max Weber, Zool. Ergebn. III. 1894, p. 427. 

 Heinirhainphtis orientalis Boulenger, Proc. Zool. Soc. London" 1897, p. 429. 



D. 9 — 10; A. 15 — 16; P. 1.9; V. 1.5; L.l. 45 — 47. 



Soincwhat compressed, the breadth of the body going 

 1.4 — 1.6 in its height. Height 6.8 — 7.8, 8.1 — 9.5 in length with 

 caudal. Head from tip of upper jaw to branchial opening 

 2.5 — 2.8 in trunk. Entire head 2.6 — 2.7, about thrice in length 

 with caudal. Length of lower jaw beyond extremity of upper 

 jaw somewhat more than 6 in length, about 7 in length with 

 caudal. Eye 1.3 — 2 in postorbital part of head, less than 

 interorbital space. Triangular part of upper jaw truncate in 

 front, longer than broad. Praeorbital rounded, about equal to 

 half diameter of eye. Teeth small, pointed. Origin of dorsal 

 above 5^11 or 6^^ anal ray. Dorsal higher than anal, both fins 

 rounded. Pectorals inserted rather far behind branchial opening, 



