FISHES OF THE CARBONIFEROUS SYSTEM. 101 
Pennsylvania, but as yet they have not been connected with any bones 
which are decisive of their generic relations. The form and general char- 
acter is that of the scales of Holoptychius, and it is certain that the fish which 
bore them must be related to, if not connected with, that genus. 
Ho.uorrycHius TUBERCULATUS, Nl. Sp. 
Plate XIX, Fig. 14. 
Among the fish remains sent to me by Mr. A. T. Lilley, of Le Roy, 
Bradford County, Pa., are some scales of Holoptychius, which seem to be 
different from any heretofore described. They are round or elliptical in 
outline, one inch to one and a half inches in diameter, and have the poste- 
rior portion occupied by coarse round or elliptical tubercles. They resem- 
ble some of the scales figured by Agassiz’ and called Holoptychius giganteus, 
but by him these are united with other scales that sometimes reach a diam- 
eter of five inches, and are very different from anything we have yet found 
in America. It is possible that our tuberculated Holoptychius was identical 
with that which carried the tuberculated scales in Scotland, but if both the 
forms of H. giganteus of Agassiz really belonged to the same fish, that was 
different from ours. If, however, the tuberculated form is a distinct species, 
it may prove to be identical with ours, and would therefore take the name 
of H. tuberculatus. It will be noticed that the tuberculated scales figured by 
Agassiz all bear enamel ridges, as ours do not; beside this, our tuberculated 
scales are found in the Chemung, which is a marine deposit, while the Old 
Red Sandstone, like our Catskill, was formed in fresh water; hence the 
species are probably all different. 
Ho.oprycHius GiGaANTEUS? Ag. 
Plate XIX, Figs. 15, 16. 
In the Catskill rocks at Mansfield, Tioga County, Pa., Mr. Andrew 
Sherwood has found some detached scales of Holoptychius which equal in 
size and resemble in markings those which were described by Agassiz under 
the name of H. giganteus. Up to the present time only isolated scales of 
1 Mon. des Poissons Fossiles, etc. (Old Red Sandstone), pl. 24, figs. 3, 4,8. 
