50 
BULLETIN OF THE LABORATORIES 
parallel to the edge. The interior of the ventral (?) valve (Fig. 14) 
is marked by two bifid grooves anteriorly and many pits. The largest 
specimen seen measures .70 by .c;o inches. 
Heinipronitcs crassus, M. and H. 
(Plate II, Fig. 19. ) 
This common Orthis-like shell is common to the sub-carbonifer- 
ous and coal measures but is much less common in the latter in Lick- 
ing Co. Specimens of this species occur sparingly at Bald Hill and 
Flint Ridge. 
PROTOZOA 
Fusulina cylindricci, Fischer. 
( Plate III, Fig. 20. ) 
The Foraminifera are represented by one species which is obtained 
from the flint-bearing limestone of Flint Ridge. In many places the 
rock was almost entirely composed of these minuie shells not larger 
than and nearly the shape of a grain of wheat. The shell is not pre- 
served but the cavity bears the markings of the exterior which are 
unmistakable. This seems to prove that the flint bearing limestone 
was formed at some depth and its flint must very likely be accounted 
for by supposing it to be derived from silicious protozoa and spongue 
spicules. Although this species probably had a calcareous shell it 
suggests that conditions prevailed suited to the growth of siliceous 
forms 
CORALS ETC. 
A species of Zaphrentis (Plate II, Fig. 21.) is indicated by sev- 
eral poorly preserved specimens but these, as well as half a dozen 
species of Bryozoa, are reserved for a latter occasion. (See Ap- 
pendix 11. ) 
In conclusion we may remind the reader that this list is of neces- 
sity quite incomplete and hasty and that it has been prepared at a 
distance from means of accurate comparison with types and was 
designed to illustrate the richness of a single limited horizon and to 
