422 ME. G. A. BOULENGEB ON FISHES 



extremely small, its diameter 4 times in interorbital width, a little nearer opercular 

 border than end of snout ; occipital process narrow, not reaching basal bone of dorsal 

 spine ; maxillary barbel extending nearly to extremity of ventral ; inner mandibular 

 barbel extending to middle of pectoral, outer to middle of ventral. Branchiostegal 

 rays 11. Dorsal I 6, originating at equal distance from the end of the snout and the 

 middle of the adipose fin ; spine rather feeble, not serrated, | length of head. Adi- 

 pose fin as long as base of dorsal or anal. Pectoral not reaching ventral ; spine feebly 

 serrated, f length of head. Anal 14. Caudal deeply forked, both lobes produced 

 into long filaments. Yellowish brown, with 9 equidistant dark brown cross-bands ; 

 head dark brown above. 



Total length 190 millim. 



A single specimen. 



6. PiMELODCs MACULATUS Lacep. 



7. PiMELODUS MODESTUS Gthr. 



8. Centromochlus heckelii Filippi. 



9. Cetopsis candiru Ag. 



10. OxYDOEAS sTEKOPELTis Kner. 



11. OXTDOEAS TRIMACULATUS, sp. n. (Plate XL. fig. 1.) 



No teeth in the upper jaw. Depth of body 4^ times in total length, length of head 

 3f times. Snout compressed, pointed, covered with skin ; posterior nostril close to the 

 eye ; diameter of eye nearly equal to length of snout, 3 times in length of head, 

 1| interorbital width ; cheeks and opercles covered with skin ; skull striated above, 

 granulate ou the sides ; fontanelle not produced as a groove posteriorly ; bases of 

 the six barbels united by the fold of the lower jaw ; maxillary barbels branched, 

 extending to base of pectoral spine ; mandibular barbels short. Gill-cleft extending 

 to below posterior border of eye. Humeral process striated, broader than and half as 

 long as pectoral spine, obliquely truncated posteriorly. Pectoral spine as long as or 

 slightly longer than dorsal, 1^ length of head, extending to middle of ventral, very 

 strongly serrated, especially on the inner side. Dorsal 1 5 ; spine feebly serrated in 

 front, strongly behind, equally distant from the end of the snout and the adipose fin. 

 Adipose fin half as long as base of anal. Anal 13. No shields between the dorsal 

 fins or on the belly. Lateral shields 31-32, nearly half as deep as the body, with 

 serrated border and moderately strong hooked spines. Caudal deeply bifurcate. 

 Yellowish ; a black spot on the dorsal, involving the base of the spine and of the first 



