20. THYNNICHTHYS. 157 



1G2. Barbus cosuatis. 



Cyprinus cosuatis, Ham. Bitch. Fish. Gan;/. pp. 3.38, 392. 



Sj'stomus inalacoptems, ]\LClell. Ind. Cypr. pp. 287, 38(3, tab. 44. 



? Rohtee pangut, Si/kes, Trans. Zool. Soc. ii. p. 30o. 

 Leuciscus cosuatis, lileek. Verh. Hat. Gen. Ned. Ind. xxv. 1853, 

 p. 139. 



L. lat. 22. Dorsal fin withoiit osseous ray. The height of the 

 body is contained twice and tliree-fonrths in the total length, with- 

 out caudal fin, which is forked. Top of the dorsal fin and a spot 

 across tlie middle of the anterior anal rays black. 



Bengal. 



a. Itiver Hooghly. From Dr. Blocker's Collection. 



1 63. Barbus pyrrhopterus. 



Systomus pyrropterus, M^Clell. Ind. Cypr. p. 383, pi. 44. fig. 1. 



L. lat. 22. L. transv. 4|/4|. The osseous dorsal ray is of mode- 

 rate strength and serrated. There are three longitudinal series of 

 scales between the lateral lino and the root of the ventral fin. The 

 height of the body is contained twice and one-third in the total 

 length (without caudal). A roundish black spot on the lateral line, 

 immediately behind the anal fin. 



Upper Assam. 



a-e. Skins, in bad state : typical examples. From M'Clellaud's 



Collection. 

 /. From the Collection of the East-India Company. 



20. THYNNICHTHYS*. 



Thynnichthys, Bleeker, Prodr. Cypr. p. 306. 



Scales small. Dorsal fin without an osseous ray, with not more 

 than nine branched rays, commencing nearly opposite to the ventrals; 

 anal fin short. Head large, strongly compressed ; eye without weU- 

 developed adipose mcmbraiie, in the middle of the depth of the head. 

 Snout with the integuments very thin; there is no upper lip, and the 

 lower jaw has a thin labial fold on the sides only. Mouth antei'ior 

 and lateral ; barbels none. Lateral line running nearly along the 

 middle of the tail. Gill-rakers none ; laminae branchiales long, half 

 as long as the postorbital portion of the head; pseudobranchiae 

 none. Pharyngeal teeth lamelliform, with flat ol)long crown, 

 5 . 3 or 4 . 2 — 2 . 4 or 3 . 5, the teeth of the thi'ee series being wedged 

 into one another. 



East-Indian archipelago and Pegu. 



* Leuciscus harengula, C. Sf V. xvii. p. 303, pi. 500. — Irawaddy. 



