8 Mr. YannELUVSs Descriptions of three 
scribed, as far as I have been able to ascertain, in any of the different works 
of European ichthyologists. | 
From the prevailing blue colour of this fish, I have been induced to call it 
the Azurine, Leuciscus coeruleus. It belongs to Cuvier's second division of 
the genus Leuciscus of Klein, a division intended to include those species in 
which the dorsal fin is placed, in a vertical line, over the space between the 
ventral and anal fins, and of which division our Red-eye, Bleak, and Minnow, 
are examples. The specific characters of the Azurine may be stated as 
follows : 
L. ovato-lanceolatus, pinná dorsali pone pinnas ventrales posità ; dorso 
plumbeo, ventre argenteo, pinnis albis. 
BI AIO P146. VO ALN tiu 
The depth of this fish is to its length as 7 to 2, and it is therefore in shape 
very similar to our Red-eye; but is at once distinguished from that species by 
the silvery whiteness of the abdomen, which in the Red-eye is of a brilliant 
golden orange; and also by its white fins, which in the other are invariably of 
a fine vermillion. It also differs in the number of its fin-rays. 
The Azurine has the upper part of the head, back and sides of slate blue, 
passing into silvery white beneath, and both shining with metallic lustre; the 
irides white, tinged with pale straw yellow; all the fins white; the lateral 
line, descending rapidly from the upper edge of the operculum, takes a curve 
parallel to the deep convex line of the abdomen; the scales large, marked 
with a variable number of radiating lines; the head small, depressed, and 
broad; the back arched; the dorsal fin commences half-way between the 
posterior edge of the eye and the end of the scaly portion of the tail; the first 
dorsal fin-ray is short, the second ray the longest, the last ray double. "The 
muzzle is blunt ; the mouth small, and without teeth; the eye large; nostrils 
pierced on the upper surface of the nose, midway between the eye and the 
upper lip; operculum of two portions, the upper one large and marked with 
radiating lines. The abdomen convex; the pectoral fins long, reaching nearly 
to the origin of the ventral fins, which arise, on a vertical line, considerably in 
advance of the dorsal fin, and thus bring that fin over the interval between the 
ventral and anal fins. From the vent the body diminishes rapidly, and the 
