32 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY — IT, 



Subfamily Centrarchin^, Gill. 



15. Centrarclius^ Cav. & Val. IG. Fomoxys, Raf. 



The first section of the subfamily of Lepiopomlnw 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 the pahitine bone, a character not hitherto noticed, to which Prof. 

 Gill has called my attention. The setiform gill-rakers, reminding us of 

 the Cichlid genus Chcetohranchus, form an important distinctive charac 

 ter of CentrarcMnw. 



ANALYSIS OF THE GENERA OF CENTRARCHID/E. 



I include here, for the sake of comparison, the aberrant genus Elas- 

 soma, whose precise afiinities are as yet undetermined : — 



A. Lateral line well developed ; vomeriue teeth present ; branchiostegals, 6 ; fins 

 largely developed, with normally more than five dorsal spines (true 

 CenirarchidcB) : 

 *. Dorsal fin ranch more developed than anal fin (the base of the formerly to 3 times 

 that of the latter}, the soft parts of the two fins abont 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, small and weak ; those of the dorsal ten, 

 the eighth and niuth quite short, so that there is a deep notch be- 

 tween the spinous and soft parts of the dorsal, almost l)reaking the 

 continuity of the fin ; caudal emargiuate; operculum emarginate be- 

 hind, ending in two fiat 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 ; supplen eutal max- 

 illary bone well developed {Alicroptcri)i(c) Mickoptkrus, 1. 



tt. Body comparatively short and deep, comprefssed ; anal spines well developed; 

 dorsal with strong spines, which are continuous with the soft rays, 

 or at least not deeply notched {Lejnopominw) : 

 a. Tongue and pterygoid bones conspicuously armed with teeth : mouth large, 

 lower jaw longest; maxillary bone broad and flat, with a strong sup- 

 ]3lenieutal ossicle behind it; inilatiue 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 : 

 c. 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, 



AKCHOPI.ITES, 2. 



dd. Tongue with a single median patch of teeth ; anal spines normally 



6 ; dorsal 10 or 11 Ambloplites, 3. 



cc. Caudal fin rounded behind ; scales cycloid ; anal sjjines normally 5, 



ACANTHAKCHUS, 4. 



6?>. Operculum ending behind in a convex "flap", black in color; anal spines 

 3; dorsal 10; caudal emarginate Cii^nobryttus, 5. 



