50 PKOCEEDINGS OF THE ACADEMY OP 



Only one species of this subgenus is known ; it is found in the rivers and 

 lakes of the northern and central parts of the North American continent. 



Type. Roccus chrysops Gill. 

 Syn. Labrax multilineatus Cuv. et Val. 



Genus Morone Gill. 

 Morone sp. Mitchill. 



Morone Gill, Proceedings of Academy of Natural Sciences of Philada., 1860, 

 p. 111. 



Body oblong-ovate, compressed, slightly gibbous at the commencement of 

 the dorsal fin. Head conical in profile, entirely covered with ctenoid scales. 

 Tongue provided only with a marginal band of villiform teeth. Preoperculuni 

 pectinated behind and below. Operculum armed Avith two spines. Sub- 

 orbital bones entire. Dorsal fins joined at their base by the slightly elevated 

 membrane ; first provided with nine spines. Anal fin with three spines and 

 from seven to eleven branched rays. 



Two species are known, both of which are peculiar to North America and 

 the neighboring islands. 



Type. Morone Americana Gill. 

 Syn. Labrax Americanus Holbrook. 



Genus Lateolabrax Bleeker. 

 Labrax sp. Cuv. et Val. 

 Perca-Labrax sp. Temminck et Schlegel. 

 Lateolabrax Bleeker. 



Percalabrax Giinther, Catalogue of the Acanthopterygian Fishes, &c, vol. i. 

 p. 70, 1859. 



Body elongated and subfusiform. Head conical in profile, covered with 

 ctenoid scales. Preoperculuni serrated behind, armed below with teeth re- 

 curved forwards. Operculum with two spines. Suborbital bones entire. 

 Dorsal fins entirely separated ; the anterior with eleven spines. Anal fin sus- 

 tained by three spines and eight rays. 



The tongue is smooth, but the interbranchial isthmus has small areas of 

 villiform teeth. 



A single species is found in the seas on the southern and south-eastern 

 coasts of Asia and the neighboring archipelagoes. 



Type. Lateolabrax Japonicus Bleeker. 

 Syn. Labrax Japonicus Cuv. et Val. 



b.** 



Jaws, vomer and palate furnished with granular teeth. 



Genus Psammoperca Richardson. 

 Labrax sp. Cuv. et Val. 

 Psammoperca Richardson, Voyage of the Erebus and Terror, Fishes, p. 116. 



Body oblong-ovate, compressed. Head conical in profile. Preoperculum 

 with the anterior margin concealed ; the posterior serrated, the inferior eden- 

 tulous, and armed at its angle with a strong horizontal spine. Suborbital 

 bones entire. Dorsal fins connected at the base ; the anterior with eight 

 spines. Anal fin shorter than the second dorsal, with three spines and nine 

 rays. 



One species is known ; it is an inhabitant of the Indian and Australian 

 Seas. 



Type. Psammoperca waigiensis Bleeker. 

 Syn. Labrax waigiensis Cuv. et Val. 



Genus Hypopterus Gill. 



Psammoperca sp. Giinther, Catalogue of the Acanthopterygian Fish, &c, vol. 

 i. p. 69. 



[Feb. 



