HISTORY OF THE FISHES OF MASSACHUSETTS. 285 



pectorals, pursues thence a straight course to tail, including in its course fifty scales. 

 Length of head equal to one fifth the length of the fish. Head naked upon its sides, 

 covered upon its top, the sides of the snout, and along the edge of the lower jaw, with 

 numerous pointed horny tubercles, broad at their bases, and acute at their tips, which 

 are larger along the edge of the jaw and quite small upon the top of the head. Very 

 small asperities are felt back of the occiput, upon the dorsum, which to the eye appear 

 like minute white dots. 



Eyes moderate, circular ; beneath them a series of mucous pores. Nostrils 

 large, tubular ; the posterior much the larger. Gape of mouth moderate ; the lips 

 slightly project when the mouth is closed. Scales upon sides of body large, very small 

 beneath pectorals. Eight scales in an oblique line above lateral line, and seven 

 below it. 



The dorsal fin is situated upon the anterior half of the body ; it is quadrate, rather 

 higher than long ; the first rays the highest. 



The pectorals are broad, rounded when expanded. 



The ventrals are fin-shaped ; they commence on a line just back of the dorsal fin. 



The anal fin is slightly emarginated. 



The caudal fin is forked. 



The fin rays are as follows: — D. 8. P. 15. V. 8. A. 9. C. 19. 



Length, five inches. 



Remarks. This beautiful little species is found in many of the streams throughout 

 the State. 



GENUS IV. CHEILONEMUS, Baikd, 1\IS. 



Body elongated, subfusiform, compressed. Head stout; its shape being that of 

 a truncated cone, owing to the bluntness of the snout. Mouth very large, sub- 

 terminal, the snout slightly protruding beyond the tip of the lower jaw. A minute 

 barbel at the angle of the mouth. Eyes of medium size. Tail tapering ; caudal 

 forked. Body covered with very large scales, which are a little longer than high, 

 subrounded or irregular in their outline. Lateral line conspicuous for the whole 

 length of the body, and slightly inflexed downwards upon the abdomen, and nearer 

 to the insertion of the ventrals than to the base of the dorsal. Dorsal and anal 

 without stout and spiny rays at their anterior margins. Insertion of ventrals situated 

 a little in advance of the anterior margin of the dorsal. Pharyngeal teeth as in the 

 Hypsolepis. Skull proportionally broader between the eyes than in the latter. 



