121 



ii. Thynnichthys Bleeker. 



(BLEEKER, Nat. Tijdschr. Ned. Indie XX. 18591860, p. 417. 

 Ichth. Arch. Ind. Prodr. II. Cyprini, 1860, p. 306). 



Oblong. Dorsal profile from snout to dorsal somewhat angular. 

 Ventral profile convex. Head pointed, broadened, with the 

 interorbital space very convex. Praeorbital nearly triangular, 

 with the point looking forwards. Suborbitals rather narrow. 

 Opercles with a large flap. Eyes lateral, in the middle of the 

 depth of the head, looking somewhat downwards, with a free 

 orbital margin, anteriorly developed into a short gelatinous 

 eyelid. Mouth anterior and lateral, its gape rather narrow. Upper 

 jaw moderately protractile. Lower jaw angular at the symphysis. 

 Integument on head very thin. No upper lip. Lower jaw 



Fig. 56. Thynnichthys thynnoides (Blkr.). X -4- 



with a thin labial fold at the sides only. No barbels. Origin 

 of dorsal slightly before that of ventrals. Dorsal without osseous 

 rays, with 8 10 branched rays. Anal short, with 5 branched 

 rays. Pectorals shorter than head. Caudal bifurcate. Scales small. 

 Lateral line slightly curved, running to the centre of the 

 base of the caudal fin or a little lower. No pseudobranchiae. 

 No gillrakers. Gilllamellae long. Gillopenings narrow, sub- 

 vertical, gillmembranes broadly united to isthmus. Pharyngeal 

 teeth with a flat, oblong crown. 5 or 4. 4 or 3. 3 or 2 2 

 or 3. 3 or 4. 4 or 5, the three series being wedged into one 

 another. 



Distribution: Fresh water of British India, Sumatra and 

 Borneo. 



Key to the ind o-australian species. 



a. Linea lateralis 47, u scales between lateral line and 



dorsal Th. vaillanti p. 122. 



