292 : Storer on the 
moved until several opportunities of drawing rare species 
_ were lost. 
Two of the species here figured are new to science. A 
third, the “ Zamna punctata," has never been figured. 
The “ Aspidophoroides monopterygius" is figured on ac- 
count of its rarity. I have never met with a good plate 
of the **Orthagoriscus mola.” 
In my classification, I have followed the arrangement 
of Cuvier, as established in the ** Regne Animal.” 
— The generic characters are generally given in the lan- 
guage of Yarrell. 
"x ORDER I. 
" ACANTHOPTERYGII. 
Family I. 
PERCOIDES. 
Perca. Cuv. 
Generic characters. Two dorsal fins, distinct, 
separated ; the rays of the first, spinous ; those. of 
the second, flexible: tongue smooth : teeth in both 
jaws, in front of the vomer, and on the palatine 
bones: preoperculum notched below, serrated on the 
posterior edge: operculum bony, ending in a _ flat- 
tened point directed backwards: branchiostegous 
rays Y : scales rough, hard, and not easily detached. 
P. pant Mitchell. The Common Perch. 
. of the Literary and Philosoph. Society of N. Y. i. 421. 
. et Valenc. Hist. Nat, des Poiss. t. ii. p.46. 
Bivianisa Fauna Boreali Americana, pt. 3d, p. 1, et fig. 
