DENTITION OF SOME DEVONIAN FISHES 35 
long, indicating a creature about two fifths larger than the aver- 
age of D. ¢errel. Believing these proportions too large for any 
known species of Dinichthys, Claypole* referred the remains to 
Titanichthys ; and later the name of D. ingens was suggested for 
them by Wright.* We propose to cancel both this title and that 
of D. kepleri in favor of the type species of Dinichthys. Other 
plates of huge size belonging in all probability to the same species 
are preserved in the museum of Kentucky State University at 
Lexington. 
4. D. clarki (Claypole).—A large species of Dinichthys allied 
to the preceding, so far as may be judged from the dentition, 
was made the type of a new genus by Claypole,3 and named by 
him Gorgonichthys clarki. No characters are shown, however, 
which warrant a separation of this form from Dinichthys; on the 
contrary, the mandible displays an interesting stage of modifica- 
tion between denticulated forms like D. herzeri, D. halmodeus, 
etc., on the one hand, and those with a sharp cutting edge like 
D. terrell on the other. 
The type of the so-called ‘‘Gorgomchthys’’ and the large 
premaxillary described by Claypole* as Dimchthys clarki have, of 
course, nothing in common. The relations of the latter are not 
accurately determinable. If excluded from Dimichthys, a new 
generic name will be required; if retained, a new specific name 
is necessary. 
GENUS CLADODUS, AGASSIZ 
This typically Carboniferous genus occurs sparingly in the 
Neodevonian, but no species have been reported from Mesode- 
vonian horizons. That it was present, however, in both the 
Corniferous and Hamilton periods is proved by at least two 
specimens which have come under the writer’s observation. One 
of these is a large tooth from the Corniferous limestone of 
Columbus, Ohio, now preserved» in the American Museum of 
* Rep. Ohio Geol. Survey, Vol. VII, 1893, p. 611. 
2 Bull. Mus. Comp. Zodl., Vol. XXXI, 1897, p. 24. 
3 Amer. Geol., Vol. X, 1892, p. I. 
4 Jbed., Vol. XII, 1893, p. 278. 
