FISHES OF THE CARBONIFEROUS SYSTEM. ee hy ag 
which are much more widely separated and are relatively larger; also by 
the ornamentation, in which the longitudinal ridges are relatively wider and 
fewer in number. 
Formation and locality: Lower Carboniferous sandstone; (Waverly), 
Grindstone City, Mich. Collected by Dr. Charles Rominger. 
GYRACANTHUS INORNATUS, Nn. sp. 
Plate XXIII, Fig. 5. 
Spine large, slightly curved, laterally compressed with an elliptical sec- 
tion, both edges being rounded; surface markings light, consisting of fine 
longitudinal strize visible over most of the surface, and parallel, oblique, 
incised lines, which occupy the sides and converge toward the anterior border. 
Only the upper half of one of these spines and the point of another are 
yet known. The larger specimen is very obtuse, evidently much worn 
and rounded by use, as the spines of other species of Gyracanthus so fre- 
quently are. The sides are also worn, and the oblique lines which once for 
the most part covered them, never being strong, are nearly obliterated. 
The point of another spine on the same block of stone is rounded in section 
and acute. 
The most striking feature in these spines is their nearly smooth sur- 
face and the single set of oblique lines on the sides. Usually in Gyracanthus 
there are two sets of these lines, crossing at right angles and producing a 
rasp-like surface. 
Formation and locality: Waverly group; Wayne County, Ohio. 
Ciapopus Romincreri, Newb. 
Plate XX VII, Fig 10. 
Cladodus Romingert, N.; Paleeontology of Ohio, vol. 2, p. 49. 
Teeth small, breadth of base seven lines, height of median cone five 
lines; central cone flattened behind, deeply sinused at base, anterior face 
rounded; lateral cones two pairs, with sometimes a rudimentary one at the 
base of the central cone; outer pair slightly less in size than the inner ones; 
surface of both central and lateral cones strongly striated. 
MON XviI——12 
