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rays, which are also gradually decreasing^ the dorsal 

 has only 14, while the anal has 16 such rays. Cau- 

 dal 28. Thoracic one and five. 



VII Genus. Red-eye. Aplocentrus. Aplocentre. 



Body elliptic, compressed. Head small, jaws with 

 lips and teeth, opercule smooth and flexuose. Vent 

 medial. One longitudinal dorsal fin with only one 

 spine. 



A singular genus, intermediate between Labrus, 

 Cynedus, and Coryphena ; but belonging to the family 

 of Labrides. The name means single spine. I 

 describe it from a drawing made by Mr. Audubon. 

 It is also the nth genus of my Prodromus. 



19th Species. Ohio Red-eye. Aplocentrus calliops. 

 Aplocentre belasuil. 



Pale greenish above, with some flexuose transver- 

 sal black lines, yellowish beneath the lateral line, 

 and with some small black lines, whitish and un- 

 spotted beneath : iris red : forehead flexuose convex : 

 upper jaw hardly longer: dorsal spine longer: tail 

 flabelliform : lateral line straight. 



A beautiful fish from eight to twelve inches long. 

 It lives in the lower parts of the Ohio, in Green 

 river, &c. Vulgar names Red-eyes, Bride pearch, 

 Batchelor's pearch, Green bass, &c. Breadth about 

 one fourth of the length. Dorsal fin beginning be- 

 hind the head with a long spiny ray and ending close 

 to the tail, variegated with flexuose black lines: 

 broad at the base, depressed near the tail, and sud- 

 denly broad again at the end. Anal fin small. 

 Thoracic fin triangular. Lateral line rather broad. 

 Iris large and red. Tail unspotted, and with rounded 

 tip or fan-shaped. 



