CHONDROSTOMA NASl'S. 



197 



occur round the eye and in the opercular region, though in some individuals 

 the black punctation is faint. The dorsal and caudal fins have a grey tint, 

 and the other fins are slightly yellow. The mouth is rather narrower than 

 in the Nasling. The scales are more pointed. The dorsal fin is less elevated. 

 There are six pharyngeal teeth on each side. This fish reaches a length of 

 nine and a half inches. 



Blanchard distinguishes another variety as Ckondrostoma dremcei, which is 

 found in Southern France, in some tributaries of the Garonne, as well as 

 in that river at Toulouse. Its colour is 

 very similar to that of the last variety. 

 The upper part of the body is a bluish- 

 grey, with a slaty longitudinal band 

 above the lateral line, though it is faint 

 in some individuals. The black spots 

 on the scales are dense about the lateral 

 line. The pectoral and anal fins are 

 dotted with black on the rays. The head 

 is shorter. The operculum is nearly 



square, and larger than in other types. The scales are short. The body is 

 much more compressed. The form of the pharyngeal bones is distinctive, but 

 the number of teeth is six on each side. 



In the Rhone there is another Chondrostoma with six pharyngeal teeth, 

 closely resembling the foregoing varieties, but distinguished by Blanchard 

 as Oh. rhodanensis. The body is yellowish, with fine black spots scattered 

 over the head and upper parts of the body. The mouth is much narrower. 

 The concentric striae on the scales are less numerous. The pharyngeal teeth 

 are more slender. It is taken at Lyons, Avignon, and many other places. 



Fig. 106. I'HARYXGEAI, TEETH OF CHOXDROS- 



TOMA XASUS. 



Chondrostoma phoxinus (HECKEL). 



D. 11, A. 1011. Scales: lat. line 8890, trans. 



17 



10. 



This delicate little fish at first sight closely resembles the Minnow. It has 

 an elongated body, with extremely small scales, and six pharyngeal teeth on 

 each side (Fig. 107). 



The greatest depth of body in front of the dorsal fin is equal to 

 the length of the head, but the fish is five and a half times as long it is 

 high. The breadth of the head is not quite half its length. The nose 

 is moderately arched, and projects a little over the upper jaw. The small 

 mouth is horse-shoe shaped, rather than semi-circular; and its cleft 



