41 



over the gill flap, upon which a double crescent is seen ; this is 

 golden at the base, with a horizontal blue or golden line below. 



Total length, about four inches ; greatest depth, one and three 

 eighths of an inch. 



Specimens were procured by S. F. Baird, from the fresh waters 

 about Hingham, and in a branch of the Charles River, at Hol- 

 liston. 



2. BoLEOsoMA FUsiFORME. The largest specimens which we 

 have seen of this species, are nearly two inches long. Body 

 slender and fusiform in shape, snout blunt. First dorsal 

 iin not contiguous to the second. Caudal posteriorly rounded. 

 The tip of the pectoral fins extends as far back as that of the 

 ventrals. 



Ground color yellowish brown, with crowded and irregular 

 black spots distributed all over the back and sides. The dor- 

 sal fins are likewise spotted. Caudal fin barred with the same 

 color ; the other fins unicolor, similar to the color of the lower 

 part of the body, which is somewhat lighter than the ground 

 color of the back and sides. 



Specimens were caught by S. F. Baird, at Framingham, in a 

 tributary of the Charles River. 



3. Esox ORNATUS. A small species, about seven or eight 

 inches in length, having the general physiognomy of Esox Ameri- 

 canus and Esoxfasciatus. The head forms a little less than the 

 fourth of the total length. The lower jaw is longer than the 

 upper one ; both are provided with very small and acute teeth. 

 The posterior extremity of the maxillary extends beyond the 

 pupil. Caudal fin forked, composed of nineteen rays ; ten to 

 the upper, and nine to the lower lobe, with a few rudimentary 

 ones above and below. Dorsal subquadrilateral, and com- 

 posed of twelve rays and an anterior rudiment. The anal has 

 about the same shape as the dorsal, and is composed of ten rays 

 and an anterior rudimentary one. The anterior margin of that 

 fin is situated a little behind the origin of the dorsal. Ven- 

 trals, situated on the middle of the space between the base of 

 the caudal and the tip of the snout, elongated and composed 

 of nine rays. Pectorals scarcely larger than the ventrals, con- 

 taining fourteen rays. 



