IGi JReport on some Fishes received from the Sitang Eiver. [No. 2, 



Pelecus eacaila, (13. H.) Tenasserim. 



Mola, nobis, n. g. A well marked group, which Dr. Jerdon 

 referred to Rhodeus of Agassiz, founded on the Cyprinus ainarus, 

 auct. It is a form of Leuciscus, having very sniall scales ; the 

 mouth terminal and opening upward, vvith the lower javv longer ; no 

 cirri; the ey es large, placed laterally near the muzzle. Form com- 

 pressed, rather deep, the back considerably arched, with the dorsal 

 medial or nearly so, and no osseons ray ; dorsal and anal fins with 

 few rays. The lateral line commences high, proceeding downward 

 and then backward, and terminating abruptly about the middle of 

 the body. No spots or other markings, beyond a broad silvery streak 

 along the sides. 



Type M. Btjchanani, nobis ; Cyprinus mola, B. H. 



M. Atkinsokii, nobis, n. s. Very similar to M. Büchanani, but 

 attains a larger size, and the scales are conspicuously larger in pro- 

 portion, the lateral silvery streak being also much broader and less 

 defined ; no tinge of blackish on the fins. Scales about 56 by 20 

 (but difiicult to count). 



D. 8.-4. 7.— P. 15.— V. 9.—C. 19. 



Length 4| in. by 1| in. deep. Tenasserim. 



N. B. — The (Rhodeus) indicüs and (Eli.) mackocephaltjs, Jer- 

 don (Madr. Joum. Lit. Se. XV, 321?) , appertain to this particular 

 type ; and the Leuciscus microlepis, Blkr. is probably identical with 

 M. macrocephalus, (Jerdon). The (Leuciscus) harengula and 

 (L.) metellina of Valenciennes should also range in the same divi- 

 sión, even if the lateral line be continuous, as represented in the 

 figures of those species. 



Fam. Oobitidce. The Loches. As suggested to me by Dr. Jerdon, the 

 species of the oíd genus Cobitis constitute an extensive natural family, 

 equivalent to Cyprinidce, Salmónido?, Siluridce, &c, and need to be 

 distributed into various genera.* In the Histoire des Poissons, 



* Mr. Swainson recognises Cobitidce as a clistinct farnily ; but then he regards 

 the Carps, tlie Salnions, the Herrings, the Pikes and the Flying fishes, as 

 ' subfamilias' otily of Salmónida ! Though why he distinguished Esocince from 

 Exocalinm does not appear, unles3 to complete his magic c eircle' of jive ; for 

 he describes Esox under Exocceíince ! In like mamier, he tried (of course) to 

 form a 'eircle of íive' of his Cobitidce, but raost imsutisfactorüv, and with 



