39. OLYRA. 97 



2. Akysis pusillus. 



Pimelodus pusillus, Ranzani, in Nov. Comm. Acad. Sc. Inst. Bonon. 1842, 

 v. p. 332. tab. 27. figs. 1-4. 



D. 1/6. A. 10. P. 1/7 (?). V. 6. 



Jaws subequal anteriorly ; the maxillary barbels extend to the 

 anal fin, the outer ones of the mandible to the base of the pectoral. 

 The height of the body is nearly equal to the length of the head, and 

 two-sevenths of the total (without caudal). Skin of the body with 

 series of very small, distant tubercles. Dorsal spine slender, denti- 

 culated behind. Adipose fin short ; caudal forked. (Ram.) 



Hah. ? 



Although this species is known only from the description and 

 figure quoted, it is not difficult to perceive its affinities: Dr. v. 

 Bleeker saw in it the type of a distinct genus, Parabac/rus, associ- 

 ating it with South American Pimelodes. 



3. Akysis macronema. 



Bleeker, Act. Soc. Sc. Ind. Need. ix. Sumatra, ix. p. 11, and Atl. Ichth. 

 Silur. p. 65. tab. 84. fig. 1. 



D. 1/5. A. 8. P. 1/5-6. 



Head nearly as broad as long, its length being one -fourth of the 



total (without caudal). The nasal barbels extend to the end of the 



head, those of the maxillaries nearly to the end of the pectoral fin. 



The length of the adipose fin is one-half of its distance from the 



dorsal. Caudal forked. 

 Sumatra (Lahat). 



a. Dr. P. v. Bleeker has sent us a specimen said to be one of the 

 types, but differing so much in some of the generic characters, 

 that we must consider it as belonging to Clyptosternum, or to a 

 genus closely allied to it ; its nostrils are not remote from each 

 other, as they are represented to be in Ahysis. However, it is 

 not sufficiently well preserved that we can decide from its ex- 

 amination whether it is really one of the typical specimens and 

 identical with the one figured, or whether some error has taken 

 place, by which we have received a different species altogether. 



Two genera are here appended, the characters of which are very 

 insufficiently known ; consequently their validity and their place in 

 the system are very doubtful. 



39. OLYRA. 



Olyra, sp., M'Clell. Calc. Journ. Nat. Hist. ii. p. 588. 



Head and bodv elongate, low ; a longish adipose fin ; dorsal fin 

 short, with a spine and with seven soft rays ; anal fin of moderate 

 length, with more than twenty rays. Barbels eight. Head covered 

 with soft skin above ; eye small. Jaws subequal in length. Teeth 

 villiform ; palate edentulous. Gill-opening wide. Caudal lanceo- 

 late ; ventral with six(?) rays, inserted below the dorsal fin. 



Khasya. 



