NOMENCLATURE AND MORPHOLOGY. 121 



dorsal fin is smaller than that of the Perch, and is placed at a 

 considerable distance in front of the second ; the anal fin is some- 

 what larger in proportion. D. 6-2, 12; P. 15; V. 1, 5; A. 3, 11 ; 

 C. 17 ; Guv. & Val. D. 6-2, 8 ; P. 15 ; V. 1, 5 ; A. 3, 11 ; C. 

 17f Rich." (STOKER, Synopsis Fish. N. A. 25, 1846.) (Copied.) 



GRYSTES NIGRICANS Agassiz, 1850. " HURO NIGRICANS Cuv. 

 is another species of the lower Canadian lakes, which occurs also 

 in Lake Champlain. The generic distinctions from Grystes does 

 not, however, rest upon sufficient characters to warrant its pres- 

 ervation in the system of fishes; I shall, therefore, call it in 

 future Grystes nigricans. It is a very common fish in some of 

 the lakes, and highly esteemed as an article of food. Through- 

 out the lake region it is known under the name of Black Bass, 

 and may be seen in large numbers in the enclosure under the 

 gallery of the Cataract Hotel at Niagara. Dr. DeKay describes 

 it as Centrarchus fasciatus, although he copies also Cuvier's de- 

 scription and figure of Huro nigricans, but without perceiving 

 their indentity. 



" In the northern lakes there is only one species of true Cen- 

 trarchus found, the Centrarchus ceneus; but it does not occur as 

 far north as Lake Superior, though it is common in Lake Huron 

 and the other great lakes." ( AGASSIZ, Lake Superior, 297, 1850.) 



GRYSTES NOBILIS Agassiz, 1854. "The species from Hunts- 

 ville, known there under the name of trout, differs equally from 

 the northern species mentioned in my ' Lake Superior,' and 

 from that of the Southern States described by Cuvier and Valen- 

 ciennes as Grystes salmoneus. Its snout is shorter, the posterior 

 end of the upper maxillary extends beyond the hinder border of 

 the eye, the head is higher, and the scales much larger in the 

 dorsal as well as in the ventral regions. No teeth on the tongue. 

 I call this species provisionally Grystes nobilis Ag. It reaches a 

 large size, and weighs occasionally from 10 to 14 pounds." 

 (AGASSIZ, Am. Jour. Sci. Arts, XVII, 297, 1854.) 



GRYSTES NUEOENSIS Baird & Girard, 1854. " Head forming 

 11 



