56 MONOGRAPH OF THE FRESH WATER III. 



on their posterior half, and at their tip there seems to be a slight indication of a 

 second bifurcation. The ventrals are inserted immediately under the first ray of 

 the anterior dorsal, and when bent backwards do not reach the anus. The base of 

 the pectorals is oblique, but not crescent-shaped ; if directed backwards their tip 

 will reach the third ray of the second dorsal, and leave the anal behind them. 

 Their rays, fourteen in number, are undivided, and the six lower ones, shorter and 

 thicker, extend beyond the membrane of that fin. 



Br. 6. D VII. 17. A 12. C 3. I. 4. 4. I. 2. V I. 3. P 14. 



The vent is situated nearly midway between the extremity of the snout ami 

 the insertion of the caudal fin. 



The lateral line is quite conspicuous even on the tail, where it is reduced to 

 cutaneous pores. Its fall on the peduncle of the tail is convex upwards, and 

 rather near the caudal fin. 



The ground color appears to have been olivaceous yellow, marbled with black, 

 the marblings extending likewise to the fins. 



For a specimen of four inches, that which we have had figured, we are indebted 

 to the kindness of Rev. Z. Thompson, of Burlington, to whom it was presented by 

 Mr. Ransom Colberth, who caught it in June, 1844, while fishing for the Brook 

 Trout in a branch of Lamoille River, in the town of Johnson, Lamoille County 

 (Vt.). The Lamoille River empties into Lake Champlatn, about ten miles north of 

 Burlington. This species, therefore, ranges west of the Green Mountains. 



XI. COTTUS BOLEOIDES, GIRARD. Sj 

 PLATE II. Figs. 7 and 8. 



Syn. Cottut loleoidet, GIRARD, Proc. Araer. Assoc. Adv. of Sc. II., 1850, p. 411 ; and, Proc. Boat. Soc. 



Nat. Hist. III., 1850, p. 189. 



Had the name of gracilis not been preoccupied to designate another species 

 of this genus, the one here referred to would have deserved it with great propriety. 



Indeed, although of medium size, it is slender and elongated. The outline of 

 the head and back is regular and slightly arched ; that of the lower part of the 

 head and belly is nearly straight. The sides are full and rounded. The body is 

 consequently subfusiform. Its greatest depth is continued six times and a half in 

 the total length, while the least depth, in advance of the caudal, enters in it nearly 

 twenty times. The thickness is one-fifth less than the depth. 



The head forms a little less than the fourth of the total length; it is nearly as 

 deep as broad, but its length is much greater than its width. Its upper surface 

 back of the eyes is slightly flattened; the anterior part slopes quite rapidly, 

 rendering the snout very obtuse : the jaws are rounded mid of equal length. The 

 mouth is proportionally broad ; when it is shut, the posterior extremities of the inux- 

 illaries extend to a line pas>ini: through the pupil. The eyes are very large and 

 sulx-irciilar ; their longitudinal diameter i- contained only four times in the length 

 of the head. They come very near each other on the frontal line, and are sepa- 

 rated by a very narrow space, narrower than in any other species. The anterior 



