KEY TO GENERA—CENTRARCHID&. 7 
Sub-Order: RHEGNOPTERI. 
Group: PERCOIDEA. 
Family: CENTRARCHIDA:. 
Key to Genera. 
A. Dorsal fin scarcely longer than anal.— POMOXIS. 
AA. Dorsal fin much larger than anal. 
B. Body comparatively short and deep, the depth usually more than 2 the length. 
Cc. Tongue and pterygoids with teeth; mouth large, maxillary reaching past 
middle of eye. 
D. Opercle emarginate behind ; anal spines 6.— AMBLOPLITES. 
DD. Opercle ending in a black, convex process or flap; anal spines, 3.— 
CH NOBRYTTUS. 
cc. Tongue and pterygoids toothless; mouth small, maxillary barely reach- 
ing past middle of eye. 
E. Supplemental bone of maxillary perfectly distinct.— APoMOTIs. 
EE. Supplemental bone of maxillary rudimentary or wanting. 
\ BE Lower pharyngeal bones narrow, the teeth usually sharp, not 
conical.— LEPOMIS. 
FF. Lower pharyngeals broad and concave, especially in the adult, 
teeth more or less blunt and paved.— EUPOMOTIS. 
BB. Body comparatively elongate, depth in adult about %4 the length; mouth 
large.— MICROPTERUS. 
Genus:  POMOXIS. 
Key to Species. 
A. Dorsal spines 6, occasionally 5, rarely 7; profile strongly sinuate, anal fin plain.— 
annularts. 
AA. Dorsal spines 7, rarely 8; profile not strongly sinuate; anal fin reticulate with dark 
markings.— Sparoides. 
Pomoxis annularis Rafinesque. CRAPPIE ; LAKE ERIE BAss ; 
Calico Bass. 
Head 3; depth 2%; eye large, 4. D. V or VI, or sometimes VII, 15; A. 
VI, 18; scales 6-48-14. Body elongate, much compressed. Head long; the 
profile from snout to dorsal strongly sinuate; mouth very wide. Fins very 
high, but lower than in P. sparoides. Color, silvery olive, mottled with 
dark green, the dark marks chiefly on upper part of body and having a 
tendency to form vertical bars; dorsal and caudal marked with dark green, 
anal nearly plain. A lighter colored fish than P. spavoides. Quite variable. 
ee 12 inches. 
Well distributed over the state in larger streams and lakes, 
common. Recorded for the state by Dr. Kirtland, who gave it 
the name Cichla storeria. ‘‘It occurs in large numbers in the 
Ohio river and its tributaries, rarely taken in Lake Erie,’’ Jor- 
dan’s Report; Muskingum river, Ohio river at Raccoon Island, 
Henshall, 1889; Lorain County, common, McCormick, 1892; 
