NOMENCLATURE AND MORPHOLOGY. 69 



nees rSunies en angle superieurement, opercule posterieur a 

 e"pine sur un appendice membraneux anguleux. Bouche tres- 

 fendue, machoires a grandes dents, sans levres, I'inferieure pro- 

 longee. Une nageoire dorsale deprimee au confluent des rayons 

 e"pineux. Nageoires thoraciques a 5 rayons dont 1 epineux. 

 Anus au mileu. A genre differe priucipalement du genre EtJie- 

 ostoma par la forme du corps de la bouche et 1'opercule ecailleux. 

 C. punctulatus. Olivatre, parseme de points noirs tres, rap- 

 proches, ligne laterale pen courbee; queue bilobee, Jaune a la 

 base noire au milieu, blanche au bout. D. ^J, A. T 3 ^, P. 15, 

 C. 24. Noms vulgaires de 1'Ohio, Black-perch et Fine-tail." 

 (RAFINESQUE, Jour, de Physique, V, 88, 420, June, 1819.) 



CALLIURUS Ratiuesque, 1820. " Body elongate, compressed, 

 scaly ; fore part of the head without scales, neck and gill-covers 

 scaly ; mouth large with strong teeth in both jaws, and without 

 lips. Gill-cover double, preopercule divided downwards into 

 three curved and carinated sutures, without serrature ; opercule 

 with an acute and membranaceous appendage, before which 

 stands a flat spine. One dorsal fin, spiny anteriorly, depressed 

 in the middle. Anal fin with spiny rays, thoracic with none, 

 and only five soft rays. Vent nearly medial. 



The generic name means fine-tail. It differs principally from 

 the genus Holocentrus, by the head, scaly gill-cover and singular 

 preopercule: genus 12 of my 70 new genera of American ani- 

 mals." (RAFINESQUE, Ich. Ohi. 26, 1820.) 



LEPOMIS Rafinesque, 1820. "This genus differs from Holo- 

 centrus by having the opercule scaly, from Calliurus by the 

 opercule only being such, while the preopercule is simple and 

 united above with a square suture over the he^ad, besides the 

 thoracic fins with 6 rays. Perhaps the Calliurus ought only to 

 be a subgenus of this. From the G. Icthelis it differs by the 

 large mouth and spines on the opercule. 



The name means scaly gills. The species are numerous 

 throughout the United States. They are permanent ; but ram- 

 blers in the Ohio and tributary streams. They are fishes of 



