32 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY—II. 
Subfamily CENTRARCHINZA, Gill. 
15. Centrarchus, Cuv. & Val. 16. Pomoxys, Rat. 
The first section of the subfamily of Lepiopomine is distinguished by 
the development of an oval patch of teeth on each entopterygoid bone, 
as well as a continuation on each pterygoid bone of a band of teeth 
from tie palatine bone, a character not hitherto noticed, to which Prof. 
Gill has called my attention. The setiform gill-rakers, reminding us of 
the Cichlid genus Chetobranchus, form an important distinctive charac- 
ter of Centrarchine. 
ANALYSIS OF THE GENERA OF CENTRARCHIDA. 
I inelude here, for the sake of comparison, the aberrant genus ELlas- 
soma, whose precise affinities are as yet undetermined :— 
A. Lateral line well developed; vomerine teeth present; branchiostegals, 6; fins 
largely developed, with normally more than five dorsal spines (true 
Centrarchide) : 
*, Dorsal fin much more developed than anal fin (the base of the former 1} to 3 times 
that of the latter), the soft parts of the %wo fins about equal, of 8 to 
14 rays, and ending at the same vertical behind: 
t. Body elongate, not greatly compressed; spines little developed, those of the 
anal fin, three in number, smal! and weak; those of the dorsal ten, 
the eighth and ninth quite short, so that there is a deep notch be- 
tween the spinous and soft parts of the dorsal, almost breaking the 
continuity'of the fin; caudal emarginate; operculum emarginate be- 
hind, ending in two flat points; mouth very large, the lower jaw 
longest ; palatine teeth well developed ; tongue and pterygoids tooth- 
less; gill-rakers long and stout, armed with teeth; supplemental max- 
illary bone well developed (Micrupterin@) ......----- MICROPTERUS, 1. 
tt. Body comparatively short and deep, compressed ; anal spines well developed ; 
dorsal with strong spines, which are continuous with the soft rays, 
or at least not deeply notched (Lepiopomina) : 
a. Tongue and pterygoid bones conspicuously armed with teeth: mouth large, 
. lower jaw longest; maxillary bone broad and flat, with a strong sup- 
plemental ossicle behind it; palatine teeth well developed; gill-rak- 
ers long and strong, provided with coarse teeth; form stout and 
heavy: 
b. Operculum emarginate behind ; anal spines 5 to 7: 
ce, Caudal fin emarginate; scales ctenoid: 
d. Tongue with two patches of teeth; anal spines normally 7; dorsal 12; 
gill-rakers longer, and somewhat more numerous than in the next, 
ARCHOPLITES, 2. 
dd. Tongue with a single median pateh of teeth; anal spines normally 
6; dorsal dl Ohor giles Seow hs om tees Sicels asic cece ener AMBLOPLITES, 3. 
cc. Caudal fin rounded behind; scales cycloid; anal spines normally 5, 
ACANTHARCHUS, 4, 
bb. Operculum ending behind in a convex “flap”, black in color; anal spines 
3; dorsal 10; caudal emarginate.......-..- seekers CHZNOBRYTTUS, 5. 
