30 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY II. 



The several species have been contrasted in the following table pre- 

 pared by Dr. Gill and myself: — 



*'. Dorsal and anal moderately developed in the male as well as female (extending, 

 when declined backward, little if any beyond the base of the caudal) ; scales on 

 cheek and opercles not crowded, and forming more or less distinct vertical series : 

 t. Body marked with about eight well-defined daik cross-bars; opercular angle with 

 a pretty large black spot, half or more the size of the eye ; spots on body and 

 fins purplish, red, or golden ; scales large, little crowded ; caudal fin moderately 

 elongate, as long as from snout to about the middle of the opercle ; lateral line 



usually incomplete behind Obesus. 



tt. Body without definite cross-bars or bands ; opercular spot smaller, but little larger 

 than pupil ; caudal fin short, about as long as from snout to the posterior mar- 

 gin of the preopercle: 

 t. Spots on body and fins pinkish or golden ; dorso-ocular profile moderately convex; 

 interorbital space quite depressed, the protruding snout forming an angle above 

 the eye ; body rather short and deep, the depth about half-length ; a small black 



spot at root of caudal ...„ Gloeiosus. 



tt. Spots on body and fins bright blue: dorso-ocular profile little convex, without 

 decided concavity above orbits ; body comparatively elongate, the depth less than 

 half-length ; no black caudal spot Makgarotis. 



•*'. Dorsal and anal fins much enlarged in the males (extending when declined back- 

 ward as far as the middle of the caudal fin), but not in the female; scales on 

 cheeks and opercles crowded together, forming oblique scries ; caudal fin very 

 long, in the males as long as from the snout to the black opercular spot; in the 

 females somewhat shorter ; anal spines less rapidly graduated ; body and fins 

 with round pale spots, some or all of which are bright blue ; lateral line complete, 



PlNXlGER. 



23. CENTRARCHUS. 



Two species, at least, of the genus Cenirarchus inhabit the waters of 

 the Southern States, which seem to have been named by Lacepede, re- 

 spectively, Labrus onacropterus and Lahrus irideus. Lahrus sparoides 

 I^ac6pede is also a Cenirarchus^ either identical with L. 7nacropterus, or 

 else it is a species not yet known. It is said to have ten dorsal and 

 ten anal spines. Centrarclius sparoides C. & Y. is apparently C. macro- 

 pterus. 



Centrarclius macropterus is a more elongate species than the common 

 Gentrarchus irideus. Its mouth is larger, the eye is larger, the fins are 

 much larger, and with longer and more numerous spines. The anal fin 

 in particular is advanced forward, so that the long spine of the ventral 

 fin laps over on the anal as in Copelandia. 



