326 The American Geologist. May. 1893 
1843 for the reception of this form, which is that of a striated and 
flattened median cusp with two or more lateral denticles, of which 
if several were present the outermost were the largest. In Clado- 
dus Icepler! oaXy a single denticle on each side of the main cusp is 
present. This is represented by Dr. Newberr}^ on Plate XLIV, which 
also gives us the earliest representation of the fish that carried 
them. This and Plate XL VI suppl}' all our knowledge on the sub- 
ject to date, except what we gather from a single ill-preserved 
specimen found in the Carboniferous limestone of Lanarkshire in 
Scotland and described by Dr. Traquair to the Geological Societ}' 
of Glasgow. A short notice of it appeared in the Geological Maga- 
zine for 1888. His specimen apparentl}^ differs considerably from 
those found in Ohio, and it is not eas}' at present to reconcile the 
characters of the two. 
On a careful and critical study of Dr. Newberry's description, 
and the figures, it appears doubtful if they are sufficientl}' close 
for sui'e determination. He has apparentl}' included more than 
one species in Cladodus hepleri, while of C. fyleri there is only a 
figure. In the light of the material now at hand we ma}' amend 
the description of the former as follows, restricting it as much as 
possible to the form to which it most nearh' applies. 
Cladodus kepleri. 
Fish about thirty-three inches in length, with elongated bod}'; 
rather slender, its greatest bi-eadth being only four or five inches. 
Head bluntly rounded in front, sometimes almost squarish as pre- 
served. Pectoral fins rounded at tip, about four inches long and 
with about eighteen strong ra3's and membranous margin, two to 
three inches wide at base, front edge about six or seven inches be- 
hind snout. 
Teeth numerous with a single small denticle on each side of the 
main cusp and about one-fourth of its hight, striate. 
Dorsal surface covered with fine unornamented shagreen, ven- 
tral surface with spiral rows of fine, thin, glossy, wrinkled scales, 
simulating ganoid armor. 
Skin on the lower side of the space between the jaws and pec- 
toral fins wrinkled transversely. 
No trace of a notochord in any degree calcified. 
Ventral fins very soft and only leaving indistinct traces on the 
stone. 
Caudal fin showing a few strong ra3's above and below. 
