790 AHE AMERICAN NATURALIST: [VOL XXXIII. 
of curculionid beetles, and is in current use. So far as I 
can determine, the next name in succession is J. W. Davis’s 
Lissolepis!; but this is preoccupied, having been imposed on 
a genus of lizards by Peters in 1872. The next name in order 
seems to be Zittel’s Isopholis.? Zittel does not indicate the 
type of his genus; and the first species named under it, cre- 
nulatus, is not, according to Mr. Woodward, a member even of 
the same suborder. The position of Z. smzinsteri, the species 
figured, is also doubtful. However, these may be removed and 
the genus allowed to rest on the species remaining; and as 
type of Isopholis we may take the species described by Agassiz 
as Pholedophorus longiserratus, it being also one of the species 
included by Zittel in his Isopholis. The family name Isopho- 
lidze may be derived from this genus. 
In 1849,* and again in 1852,° Roemer defined from manu- 
script of Debey a new genus of fishes, which he called 
Ancistrodon, The generic name cannot in my opinion stand, 
being practically preoccupied by Agkistrodon, proposed in 1799 
by Palisot de Beauvois. Although differing in form, the two 
` names are merely different ways of transliterating the same 
Greek words. Furthermore, many authors have written the 
ophidian generic name Ancistrodon. Professor S. F. Baird so 
spelled the word as far back as 1859. Unless we are prepared 
to adopt the recently suggested rule to regard as eligible all 
names which differ by a single letter, no matter how that 
difference has been produced, we must, I think, abandon 
Ancistrodon as a generic name in ichthyology. In its place 
I offer the name Grypopon, from ypizos, hooked, and oder, 
tooth. The type of the genus is G. ¢exanus Dames. Other 
species described’ are G. mosensis Dames, G. lybicus Dames, 
G. armatus Gerv., G. vicentinus Dames. 
I have already referred to S. A. Miller's First Appendix to 
1 Ann. Mag. Nat. Hist. (1884), vol. xiii, p. 448. 
2 Handb. Paleont., vol. iii, p. 216. 
3 Cat. Foss. Fishes, vol. iii, p. 463. 
4 Texas, etc., p. 419. 
5 Kreidebild. von Texas, p. 30. 
6 Trans. Amer. Philos. Soc., vol. iv, p. 381. 
1 Dames, W. Zeitschr. deutsch. geol. Ges., vol. xxxv (1883), pp. 656-670. 
