76 | Cincinnati Society of Natural History. 
clined to think it is sufficiently distinct to have a specific name. The 
interradial and axillary plates may have each contained a central 
tubercle or spine, but our specimen is not in such a state of preserva- 
tion as to determine this. 
STROTOCRINUS BLOOMFIELDENSIS. 
Plate I., fig. 6, natural size, but the underside of the canopy should be dropped down to 
the dotted lines. 
(Strotocrinus bloomfieldensis, S. A. Miller, 1879, Jour. Cin. Soc. Nat. Hist., vol. ii., p. 258, 
pl. XV., figs. 6, 6a.) - 
This species was originally founded upon a east, but later I re- 
ceived from W. C. Egan, of Chicago, the matrix, from which a gutta 
percha cast was taken, and by this means we have the surface mark- 
ing of the plates completely restored, and are enabled to add to the 
description. 
The third radial is octagonal, instead or heptagonal, having a short 
superior face, upon which an inter-axillary plate is supported. 
The species most resembles S. regalis, from which it is, however, 
readily distinguished, by its much shorter first radials, by the octa- 
gonal third radials, instead of heptagonal, by the presence of the sub- 
central proboscis, and by numerous minor differences. ‘The ornamenta- 
tion of the plates, too, is different, though there is great similarity be- 
tween them, in this respect. It need not be compared with any other 
known species. 
ORTHODESMA BYRNESI, 0D. Sp. 
Plate I., fig. 7, view of the left valve, natural size; fig. 7a, cardinal view, natural size; 
ye 0s magnified, view of the matrix, showing that the shell was covered by numerous 
ittle spines. 
Shell of medium length and breadth, but proportionally very , fie 
_ Cardinal and basal margins sub-parallel, but gradually diverging pos- 
teriorly to the posterior third of the shell. The cardinal line is straight, 
posterior to the beaks, for about one third of the length of the shell, 
from which point it gradually declines to near the extremity, which is 
abruptly rounded. Anterior end contracted beneath the beaks, and 
beautifully rounded in front. Basal line concave in the middle part, 
for about one half the length. Beaks small, but nearly or quite unit- 
ing; umbones flattened, and, from which, there is a shallow expanding 
depression, directed a little posteriorly, and crossing the valves to the 
basal line. 
Surface of the valves marked by concentric lines, and covered by ~ 
numerous little spines. 
Length, 1 2-10 inches; height, 5-10 inch; thickness, 25-100 inch: 
The species is founded upon a specimen preserving the shell, and 
