4 NORTHERN ZOOLOGY. 



[2.] 2. Perca acuta. (Cuvier.) Sharp-nosed Perch. 



La perche a museau pointu {Perca acuta). Cuv. et Val., ii,, p. 49, pi, 10. 



This species was found in Lake Ontario, by MM. Milbert and Le Sueur. It 

 strongly resembles the P. flavescens, but its lower-jaw is proportionably longer, 

 and its snout more pointed. It wants the black spot on the first dorsal. 



Perca gracilis {Cuv. et Val., p. 50) is probably also a Canadian fish, but it has 

 hitherto been found only in Lake Skaneateles, on the New- York side of Lake 

 Ontario. It also resembles P. flavescens, but its preoperculum is not denticu- 

 lated ; the spine of the second dorsal is very short and slender, and the spot on 

 the first dorsal small. 



[3.] 1. Perca (Huro) nigricans. (Cuvier.) The Huron. 



Family, Percoidese. Genus, Perca. Sub-genus, Huro, Cuvier. 



Le Huron {Huro nigricans). Cuv. et Vai. , ii., p. 124, t. 17. Cuv. Reg. An., ii., p. 135. 



Baron Cuvier established this sub-genus on the inspection of a solitary specimen 

 which was prepared for me by Mr. Todd at Penetanguishene, on Lake Huron. 

 In the analytical table of genera, given in the Histoire des Poissons, it stands 

 among the Percoidese having their ventrals, containing only five soft rays, situated 

 under the pectorals ; seven rays in the branchiostegous membrane ; two distinct 

 dorsal fins, or one fin divided into two by a notch extending to its base ; and all 

 the teeth small and crowded like the pile of velvet (dents en velours). The 

 specimen is a dried one, of the right side of the fish, and contains only six bran- 

 chiostegous rays, nor is there a trace of another ever having been inserted into that 

 limb of the os hyoides ; yet in his description the Baron enumerates seven. Mr. 

 Todd counted only six in the recent fish. The Baron says that the Huron would 

 possess all the characters of the Perch, if it were not devoid of denticulations on 

 the bones of the head and shoulder, and particularly on the preoperculum*. Few 

 fish of the family, he observes, possess this smooth-edged preoperculum, and, in 

 fact, on reviewing the characters of his genera and sub-genera, we find, that of that 



* The want of denticulations in the preoperculum is considered to be merely a specific distinction in the Perca flaves- 

 cens, Cuv. 



