540 MASTACEMBELID-E. 



1. Rhynchobdella aculeata. 



Pentophtlialnuis, Wilhcghh. App. tab. 10. 428. 

 Mastacembelus, sp., (ironov. Zoaplujl. p. 133. 

 Euchelyopus, sp., Klein, Pise. 3Iiss. iv. p. 58. n. 18. 

 Opliidiuiii aeuleatum, Bl. tab. 15',). f. 2. 

 Rhynchobdella orieutalis, Bl. Sclin. p. 478. 



aral, Bl. Schn. p. 470. taf. 89. 



Macroguathiis aculeatus, Lacep. ii. p. 284 ; Bicch. Ham. Fish. Gang. 



p. 29. 

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

 Macrognathns ocellatus, Biicli. Ham. I. c. p. 29. 

 Rhynchobdella aral, Cttv. S,- Val. ^aii. pi. 239. 

 — — ocellata, Ctu: 4" Val. viii. p. 445 ; Bleek. Verh. Batav. Genootsch. 



xxiii., Notac. p. 5. 

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



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

 Caee. 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. Adult. Calcutta. From the Collection of Messrs. von Schla- 



gintweit. 

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

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

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



PfeifFer. 

 h, i. Adult. Moluccas. 

 A:-m. Adult, Borneo. 



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

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



Var. siamensis : D. 13 | 55. A. 3 | 58. Five black ocelli along 

 the base of the dorsal fin ; a pair of confluent oceUi 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. Zoophyl. p. 133 (not Klein). 

 Mastacembelus, Cuv. Sf Val. viii. p. 452. 



Body elongate, eel-hke, covered with very small scales ; head 

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

 which is not transversely striated infcriorly. Cleft of the mouth 

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

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

 (except in M. maculatiis). 



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



