LEUCISCUS TUKPKYr. 



1(39 



their own diameter from each other, and from the snout. The angle of the small 

 mouth reaches back to below the front of the orbit, but is directed obliquely 

 downward, as in the allied species. The first bone of the sub-orbital ring 

 is remarkably broad and large. The ventral fins are in the middle of the 

 body. The dorsal fin is slightly farther back, but its longest rays have only 

 the length of the head ; it is truncate behind. The anal fin is less obliquely 

 truncate, and is lower. The ventral and pectoral fins are both well-developed. 

 The latter is as long as the terminal rays of the caudal fin, being one-sixth 

 of the length of the body. The ventrals reach back to the vent. The largest 

 scales are two-fifths of the diameter of the eye ; they have numerous rays 



Fig-. 92. — LEUciscrs tukskyi (heckel). 



on the free border, but the concentric markings are feeble. There are five or 

 sis longitudinal series of scales between the lateral line and ventral fin. The 

 colour of the back is blue-green, the sides are shining golden yellow, and the 

 abdomen is silvery. The black longitudinal band extends down to the 

 lateral line throughout its length. All the fins, except the dorsal, are deep 

 orange at the base. 



Leuciscns microlepis (Heckel). 



D. 11, A. 11, Y. 9. Scales: lat. line 73—75, transverse 15 — 7. 



This fish has very much the form of the Dace, with the head long and 

 pointed, the mouth large and oblique, scales very small, and all the fins 

 pale yellow (Fig. 98). It is probably only a variety of L. furf>kt/i. It is from 

 four to four and a half times as long as the head, and, as in the allied 

 forms, the length of the head exceeds the depth of the body in front of the 

 dorsal fin. The eye is one-sixth of the length of the head; in old age it 

 becomes relatively a little smaller. The I'rontal interspace between the eyes is 



