FISHES OF THE CARBONIFEROUS SYSTEM. 11 a1i5) 
cated over the entire body; on the anterior and middle portions one inch 
and at base of caudal fin one half inch in diameter; exposed portion oceu- 
pied by broad, flattened, striated, radiating, or reticulated ridges; on the 
sides and anterior portion of the body the scale-markings are finer, more 
numerous, and parallel. 
Only one specimen of this fish is yet known. It was found near Delhi, 
N. Y., and was presented many years since to the State cabinet by Rev. 
“Mr. Fitch. This specimen wants the head, but in the two pieces which rep- 
resent it nearly all of the body from the base of the pectoral fins is shown. 
The form is in a general way similar to that of the restoration of Holopty- 
chius given by Huxley in his essay upon the fishes of the Devonian epoch,' 
but the body is less symmetrically narrowed posteriorly and the extension 
of the scaled portion is abruptly turned upward at the base of the caudal 
fin. All of the fins are also broader and more rounded than in the figure 
cited. The ornamentation of the scales is in general similar to that of sev- 
eral described species of Holoptychius, especially that of H. nobilissimus and 
H. Murchisoni, but no portion of the surface bears granulations or tubercles, 
and the flattened ridges are elaborately ornamented with waved and inos- 
culating thread-lines. The scales seem to have been smaller and thinner 
than those of H. Americanus, which are so common in the Catskill rocks, 
and the surface marking is less strong and parallel. 
The type specimen of this species is in the State Museum at Albany, 
where it will serve as a standard of comparison with other remains of 
fishes which are likely to be gathered in considerable numbers from the 
Catskill rocks To the courtesy of Professor Hall, the director of the mu- 
seum, I am indebted for an opportunity of examining and describing it, and 
I take pleasure in attaching his name to the only species of which any 
considerable portion of the body has yet been obtained in North America. 
Ho.optycuius ? RADIATUS, n. sp. 
Plate XX, Figs. 12-14. 
Body two feet or more in length, fusiform, covered with relatively 
small, round, or elliptical highly ornamented scales. Of these the covered 
! Memoirs Geol, Survey United Kingdom, Decade 10, 1861, p. 5. 
