SPAROID FISHES OF AMERICA AND EUROPE. 495 
73. POMADASIS CORVINA|FORMIS. 
Hemulon corvineforme Steindachner, Ich. Notizen, vit, 16, 1868 (Santos, Brazil). 
Habitat: Coast of Brazil. 
Etymology: Corvina, a genus of Scienida; forma, shape. 
This species has been taken a few times on the coast of Brazil. The 
specimen examined by us (4539, M. C. Z.) was collected by Agassiz at 
Rio Grande do Sul. 
74. POMADASIS LEUCISCUS. 
Pristipoma leuciscus Giinther, Proc. Zool. Soc. London 1864, 147 (San Jose de Nica- 
ragua, Chiapas). 
Habitat: Pacific coast of tropical America. 
Etymology: Leuciscus, a chub or shiner, from Acvxdc, white. 
This species is not rare on the Pacific coast of Mexico. The speci- 
mens examined by us are from Mazatlan and Panama. 
75. POMADASIS ELONGATUS. 
Pristipoma leuciscus, var. elongatus Steindachner, Neue und seltene Fische aus dem k. k. 
Museum, 1879, 30, 52, Taf. 9, f. 2 (Tumbez, west coast of South America). 
Habitat: Pacific coast of tropical America. 
Etymology: Hlongatus, elongate. 
This species occurs with P. leuciscus, and so far as our experience 
goes it is the more common of the two. The differences between them 
are very slight. Hlongatus is more slender, with straight profile, the 
preorbital broader, and the anal spines somewhat smaller, the third 
hardly as long as the second. In all other respects the two are identical 
and, at the best, P. elongatus must be regarded as a doubtful species. 
Possibly it is the male of P. leuciscus, but such sexual differences, or in 
fact any sexual differences, are unusual in the family. 
XVI. ORTHOPRISTIS. 
Orthopristis Girard, U.S. Mex. Bound. Survey, 1859, 15 (duplen=chrysopterus) 
Microlepidotus Gill, Proc. Ac. Nat. Sci. Phila. 1862, 255 (inornatus). 
Pristocantharus Gill, Proc. Ac. Nat. Sci. Phila. 1862, 256 (cantharinus). 
Isaciella Jordan & Fesler, subg. nov. (brevipinnis). 
Type: Orthopristis duplex Girard=Perca chrysoptera Linneus. 
Ktymology: cpédc, straight; zpéors, used for xpéotys, a Saw, in refer- 
ence to the evenly serrated preopercle. 
This genus contains a considerable number of species differing from 
Pomadasis by the long anal fin, the smaller scales, and by the less devel- 
opment of the dorsal spines. Nearly all the species are American. The 
group is divided into three subgenera, the extremes of which differ 
considerably from each other. 
For the sake of comparison, we introduce the single representative 
of this genus found in the waters of Europe. 
