540 .MASTACEMBKLID.-E. 



1. Rhynchobdella aculeata. 



Pentophtlialmus, Wilhujlib. App. tcab. 10. 428. 

 Mastacembelus, sp., Gro)inr. Zooplnjl. p. 133. 

 Eucheh'opus, sp., Klein, Pise. Miss. iv. p. 58. n. 18. 

 Opliidiiuii aculeatum, Bl. tab. 159. f. 2. 

 Rhvnchobdella orientalis, Bl. Schn. p. 478. 



aral, Bl. Schn. p. 479. taf. 89. 



Macrognathiis aculeatus, Lacep. ii. p. 284 ; Buch. Ham. Fish. Gang. 



p. 29. 

 Ophidium rostratum, Shaw, Zool. iv. p. 73. 

 Macrognatliiis ocellatus, Buch. Ham. I. c. p. 29. 

 Rhyncbobdella aral, Ciiv. ^- Val. viii. pi. 239. 

 ocellata, Ciiv. Sf Val. viii. p. 445 ; Bleek. Verh. Batav. Genootsch. 



xxiii., Nofac. p. 5. 

 Mastacembelus pentophtlialmus, Gronov. Si/st. ed. Gray, p. 172. 



D. (13) 18-20 I 52-54. A. 3 | 52. Vert. 32/40. 

 Csec. pylor. 2. 



Vertical fins not contiguous ; a series of two to eight black, white - 

 edged ocelli along the base of the soft dorsal fin. 

 Fresh waters of the East Indies. 



a. Adult : dried. Calcutta. From Mr. Griffith's Collection. 



h. Adidt. Calcutta. From the Collection of Messrs. von Schla- 



gintweit. 

 c. Adult. Madras. Presented by T. E, J. Boileau, Esq. 

 d-f. Adult. Khasya. Presented by Sir W. Hooker. 

 g. Fine specimen. Ceram. From the Collection of Madame Ida 



Pfeiff"er. 

 h, i. Adult. Moluccas. 

 k-m. Adult. Borneo. 



n-p, q-r, s, t. Adult and half-grown. East Indies. 

 u. WuiG inches long. — Type of Ophidium rostratum, Shaw. 



Var. siamensis : D. 13 | o5. A. 3 ] 58. Five black ocelli along 

 the base of the dorsal fin ; a pair of confluent ocelli at the base of 

 the caudal. Dorsal spines very feeble. — Having only one specimen, 

 we do not feel that we should be justified in describing it as a sepa- 

 rate species. 

 a. Fine specimen. Pachebore. From M. Mouhot's Collection. 



2. MASTACEMBELUS. 



Mastacembelus, sp., Gronov. Zoophijl. p. 133 (not Klein). 

 Mastaceiiibelus, Cuv. 8c Val. viii. p. 452. 



Body elongate, eel-like, covered Avith very small scales ; head 

 elongate, the upper jaw terminating in a long moveable appendage, 

 which ifj not transversely striated inferiorly. Cleft of the mouth 

 rather narrow, with the lower jaw very little moveable. Minute 

 teeth in the jaws. Praeoperculum with spinous teeth at the angle 

 (except in M. maculatus). 



Fresh waters of the East Indies, extending westwards to Syria. 



