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branched rays. Scales moderate. Lateral line complete, running 

 in the middle of the tail, sensory tubes undivided. No sensory 

 folds on head. Gillmembranes broadly united to the isthmus. 

 Pharyngeal teeth 5.4.2 — 2.4.5. 



Distribution: Fresh water of Sumatra, Java, Borneo, 

 Banka, Singapore, Malacca, Siam, Tonkin, Burma. 



Key to the indo-australian species 

 o f Osfcochiliis. 



I. L. 1. 45-53- 



g gL 



1. L. tr. r-^. L. 1. 47 — 40. Pores on snout . . O. hornccnsis p. 126. 



9i 



1 1 12 



2. L. tr. . L. 1. 45 — 53. No pores on snout. O. viclanopleitra p. 127. 



7 1 8 



II. L. I. 38 — 39. L. tr. ^^^^ — ^. No pores O. Malmii p. 128. 



III. L. 1. 32 — 36, with or without pores. 



1. Caudal peduncle surrounded by 20 scales. Middle 



of eye in level with cleft of mouth 0. scJiles^eli p. 129. 



2. Caudal peduncle surrounded by 16 — 17 scales. 

 Eyes situated higher upwards^ 



a. Pores on snout. 



a'. With 2 pores 0. kahajaneiisis p. 130. 



h'. With 3 or more pores. 



i) 5 series of scales between V. and L. 1. O. rcpaiig p. 131. 



2) 4 — \\ series of scales between V. and L.l. 



a. 5t scales below L. 1 0. fripoms p. 133. 



/3. 6V scales below L.l O. vittatus p. 131. 



3) 3^ — 4 series of scales between V.and L.l. 



a.. 5V scales below L.l O. hcllits p. 134. 



/3. 61- scales below L.l O. intermedins p. 134. 



h. No pores on snout. 



a' . 4^ — 5I- series of scales between L. 1. and 

 dorsal. 



1. Dorsal 3.10 — 11; least height of 

 caudal peduncle 1.2 — 1.6 in length 



of peduncle O. bracliynotopterus p. 134. 



2. Dorsal 3. 12 — 18; least height of caudal 

 peduncle about equal to length of 



peduncle O. Iiasselti p. 135. 



h' . 6. I — 7 series of scales between L. 1. 

 and dorsal. 



