GENEEA OF CENTRAECHIDiE. 923 



bb. Spinous dorsal longer than soft part, the spines abont 13 in number, not lap- 

 idly graduated ; anal spines normally 8 ; body deep ; niDuth moderate. 



Centrarchus 62. 

 a. Dorsal fin much longer than anal fin, the base of the former li to 3 times that of 

 the latter ; the soft parts of the two fins aboat equal, of 8 to 14 rays, and end- 

 ing at the same vertical behind, 

 c. Body comparatively short and deep ; compressed ; anal spines well -developed, 



dorsal spines strong, not separated by a deep notch from the soft rays. 

 4. Tongue and pterygoid bones toothless ; mouth moderate or small. 



e. Operculum ending behind in an entire convex process or flap, which'is al- 

 ways more or less black ; dorsal spines normally 10 ; anal spines 3 ; the 

 soft rays in each fin about 10 ; caudal fin emarginate. 

 /. Lower pharyngeal bones with the teeth, or most of them, coarse, rounded 

 or truncate above, i. c, teeth paved ; the bones themselves broad and 



concave Eupomotis. 63. 



ff. Lower pharyngeal bones narrow, with the teeth all, or nearly all, conio 



and sharp. ■ Lbpomis. 64. 



dd. Tongue and pterygoid bones with teeth ; month large. 

 g Operculam ending behind in a convex flap ; anal spines 3. 



Ch^nobkyttus. 65. 

 gg. Operculum emarginate behind ; anal spines usually 6. 



Ambloplites. 66. 

 * Body elongate, not greatly compressed ; dorsal spines 10 ; anal 3 ; dorsal fiu nearly 

 divided into two fins by a deep notch ; caudal emarginate ; opercle emarginate ; 

 mouth very large ; supplemental maxillary bone well developed. 



MiCROPTERUS, 67. 



Genus 61. POMOXYS. Eafinesque. 



Pomoxis, Eafinesque, Journ. Acad. Nat. Sci. Phila., 417 (annularis). 

 Pmnoxya, Gill, Amer. Journ. Sci. Arts, 1864. 

 SyperUtius, Gill, Amer. Jonrn. Sci. Arts (hexacanthus). 



Type, Pomoxis annularis, Eaf. 



Etymology, poma, operole ; oxus, sharp. 



Dorsal and anal fins about equal in extent, the soft portion of the latter longest and 

 most posterior, the two fins being obliquely opposed ; spinous dorsal little developed, 

 shorter than soft part, continuous with it, the spines 5 to 8 in number, rapidly gradu- 

 ated; anal spines normally six; body compressed and rather elongate; month large; 

 lower jaw longest ; supplemental maxillary bone well developed; gill-rakers setiform, 

 very long, about 20 in number, armed with teeth ; palatine teeth present ; opercle emar- 

 ginate behind ; scales nearly smooth. 



This genus contains, so far as is known, but two species; both of which are described 

 below : 



Analysis of Species of Pomoxys. 



a. Dorsal spines 6. ..... . annularis. 113. 



aa. Dorsal spines 7 or 6. . , . , . . sfaroises. 114. 



