22O 



Key to the indo-australian species o f Tylognathus. 



I. Two barbels only. 



1. Least height of caudal peduncle surrounded by 



12 scales T. hispidus p. 220. 



2. Least height of caudal peduncle surrounded by 

 1 6 scales. 



a. Pectorals equal to or longer than head, linea 



lateralis 34 35 T. bo p. 221. 



6. Pectorals shorter than head, linea lateralis 



37 38 T. kajanensis p. 221. 



II. Four barbels. 



1. 4 ! / 2 scales above lateral line T. lehat p. 222. 



2. 5'/2 scales above lateral line. 



a. Length of head less than height of body. . . T. falcifer p. 222. 



b. Length of head equal to height of body . . . T. schwanefeldi p. 223. 

 Doubtful species T. hasselti p. 224. 



i. Tylognathus hispidus (C. V.). 



Labeo hispidus Cuvier & Valenciennes, Hist. Nat. Poissons XVI. 1842, p. 356. 

 Chondrostoma lipocheilos Cuvier & Valenciennes, Hist. Nat. Poissons XVII. 1844, 



p. 400. 



Gobio javanicus Bleeker, Nat. Tijdschr. Ned. Indie XIII. 1857, p. 358. 

 Lobocheilus (Gobionichthys) javanicus Bleeker, Acta Soc. Sc. Indo-Neerl. VI. 1859, 



Enumeratio pise. p. 145. 

 Lobocheilus (Gobionichthys) lipocheilus Bleeker, Ichth. Arch. Ind. Prodr. II. Cyprini, 



1860, p. 154. Atl. Ichth. III. 1863, p. 59. 

 Tylognathus hispidus Giinther, Cat. Brit. Mus. VII. 1868, p. 66. 

 Lobocheilos hispidus Fowler, Proc. Acad. Nat. Sc. Philadelphia (2) LVII. 1905, p. 483. 

 Tylognathus hispidus Popta, Notes Ley den Mus. XXVII. 1906, p. 108. 



M. 



D.4.8 9; A. 3.5; P. 1.1415; V.2.8; L.I. 35 36;L.tr.j_. 



51 



Height 3 3 / 4 4 5 / 7 , 5 to more than 6 in length with caudal. 

 Head 4 5^3, more than 5 7 1 /* in length with caudal. Eye 

 more than 3 to more than 4, its centre situated somewhat 

 behind the middle of the length of the head. Structure of mouth 

 and of snout as in Fig. 88, but having two maxillary barbels 

 only. Origin of dorsal in advance of that of the ventrals, op- 

 posite to the loth scale of the lateral line. Anterior dorsal 

 rays more or less prolonged in adult examples. Anal more or 

 less emarginate, its height less than that of dorsal. Pectorals 

 and ventrals subequal, 6 6 l j 3 in total length. Caudal deeply 

 forked. There are 3 4 longitudinal rows of scales between 



