13. TYLOGNATHUS. 63 



is short, its length being considerably less than the width of the 

 interorbital space, which is convex. Ej'e small, one-fifth or one- 

 sixth of the length of the head, and more than one-half of that of 

 the snont. There are nine longitudinal series of scales between the 

 lateral line and ventral fin. The length of the head is contained 

 four times and three-fourths in the total (without caudal), the 

 height of the body thrice and two-thirds. Fins short. The origin 

 of the dorsal fin is in advance of that of the ventral, and 

 nearer to the end of the snout than to the root of the caudal. 

 Blackish-green above, shining silvery on the sides and abdomen. 

 The reflection of light produces a darker line along each series of 

 scales above the lateral line. 



Poena. 

 a-b. Seven inches long. Presented by Licut.-Col. Playfair. 



This fish is very similar to one represented by Buchanan in his 

 manuscript drawings under the name of Cyjirinvs hctngon, and 

 erroneously referred by M-Clclland to his Gohivs Umnoj^ihUus, Ind. 

 Cypr. p. 358, which is a fish with much larger scales. M'Clelland 

 gives a copy of this drawing, tab. 58. fig. 2. However, Buchanan 

 has also added an upper view of the head (omitted by M'Clelland), 

 in which two rostral barbels are very distinct. 



2. Tylognathus ariza. 



Cypriuus ariza, Buchnnan, Journey through Mysore, iii. p. 344, pi. 



'31 ; Fish. Gany. pp. 286, 386. 

 Gobio hamiltonii, Jerdoii, Madr. Journ, Lit. <§• Sc. xv. 1849, p. 307. 

 bovanius, Jerdon, I. c. 



Closely allied to T. hoya. 



D. 12. A. 7. L. lat. 37. L. transv. 7i/7|. 



Two small barbels. Snout rather thick, projecting beyond the 

 lower jaw, without lateral lohe. Eye of moderate size, somewhat 

 before the middle of the length of the head. There are five longi- 

 tudinal series of scales between the lateral line and the root of the 

 ventral fin. Body oblong, its depth being more than the length of 

 the head, and one-fourth of the total (without caudal). The origin 

 of the dorsal fin is considerably in advance of that of the ventral, 

 and nearer to the end of the snout than to the root of the caudal. 

 Caudal fin deeply forked. Coloi'ation uniform. 



Peninsula of India. 

 a. Seven and a half inches long. Madi'as. Presented by Capt. 

 Mitchell. 



Buchanan distinguishes this species from T. hoga by the absence 

 of pores on the snout. Our specimen has very distinct pores ; and 

 it is probable that this peculiarity of the skin is equally developed 

 in both species at certain seasons of the year. 



Gohio isitrus, M'Clell. Ind. Cypr. pp. 277, 357, from Assam, is 

 said to be very similar to T. ariza ; indeed no characters by which 

 the two fishes might be distinguished have been pointed out. 



