GENERA OF CENTRARCHIDZ. 923 
bb. Spinous dorsal longer than soft part, the spines about 12 in number, not rap- 
idly graduated ; anal spines normally 8; body deep; mouth moderate. 
CENTRARCHUS 62. 
aa, Dorsal fin much longer than anal fin, the base of the former 14 to 3 times that of 
the latter; the soft parts of the two fins about equal, of 6 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. 
d. 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. 
f. Lower pharyngeal bones with the teeth, or most of them, coarse, rounded 
or truncate above, i. e., teeth paved; the bones themselves broad and 
concave. 6 6 5 . : EUPOMOTIS. 683. 
Sf. WUower pharyngeal Peids narrow, cali the teeth all, or nearly all, conic 
and sharp. : : : : 6 5 LEPOMIS. 64. 
dd. ‘Tongue and pterygoid bones with teeth: con large. 
g Operculum ending behind in a convex aan anal spines 3. 
. CHZENOBRYTTUS. 65. 
gg. Operculum emarginate behind; anal spines usually 6. 
-AMBLOPLITES. 66. 
** Body elongate, not greatly compressed; dorsal spines 10; anal 3; dorsal fin 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. Rafinesque. 
Pomoxis, RAFINESQUE, Journ. Acad. Nat. Sci. Phila., 417 (annularis). 
Pomoxys, GILL, Amer. Journ. Sci. Arts, 1864. 
Hyperistius, GiLL, Amer. Journ. Sci. Arts (hexacanthus). 
Type, Pomoxis annularis, Raf. 
Etymology, poma, opercle ; 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; mouth 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 : ; .  SPAROIDES. 114. 
