TELEOSTEI. PIIYSOSTOMI. 



the head, above the level of the angle of the mouth. Jaws of 

 nearly equal length, head depressed. Nostrils patent, wide apart, 

 the posterior with a barbel in front of it, the anterior just over the 



Fig. 51. Olyra burmanlca. 



snout, but not in front of it. Gill-openings wide, not confluent 

 with the isthmus, and extending laterally to opposite the end of 

 the opercle. Barbels eight, not dilated at their bases, the maxil- 

 lary the longest, almost extending to the base of the ventral h'n, 

 the external mandibular as long as the head. Teeth villiform in 

 both jaws, those in the outer row slightly the longest ; in an uninter- 

 rupted horseshoe-shaped band across the palate. Lateral line 

 present. Skin smooth. Air-bladder large, thin, and in the ab- 

 dominal cavity. Fins dorsal without any spine, its first ray the 

 shortest, it arises opposite the ventral ; adipose dorsal very low 

 and long. Pectoral spine rather strong, slightly serrated externally, 

 coarsely so internally, the fin only extends halfway to the ventral. 

 The anal rays increase in length to the last. Caudal with its central 

 rays strongest and elongated, making the fin one third of the total 

 length. Colour dark brown. 

 Ifab. Pegu Toma or Mountains. 



130. (3.) Olyra laticeps. 



Olyra laticeps, McClelland, Culc. Jour. N. H. ii, p. 588, pi. xxi, fig. 2 ; 

 Day, Fish. India, p. 475 (see synoii.). 



B. xiii. D. 6/0. P. 1/9. V. 7(6?). A. 15. C. 18. 



Eyes small and vertical. Head much depressed at the snout. 

 Lower jaw longer than the upper. Six or eight slender barbels. 

 Teeth villiform in the jaws, palate edentulous. Fins the anal 

 rays gradually increase in length from the commencement of the 

 fin. Caudal entire. 



Hob. Khasi hills. 



9. Genus AMBLYCEPS, Blyth. 



Branch iostegals twelve. Gill-openings wide, the gill-membranes 

 not confluent with the skin of the isthmus, notched as far forwards 

 as the chin. No thoracic adhesive surface. Head covered with 

 soft skin. Eyes small, subcutaneous. Mouth anterior ; gape wide. 

 Nostrils close together, the posterior having a barbel. Teeth in 

 jaws villiform ; palate edentulous. Anterior dorsal fin enveloped 



