OF DENISON UNIVERSITY. 
27 
found in the southern and central part of the state at from 70 to 100 
feet above conglomerate II with no connecting or introducing forms, 
it also occurs in the Cuyahoga shales from 100 to 150 feet from the 
top. 
SPIRIFER (MARTINIA) TENUISPiNATUS, Sp. n. 
(Plate IT, Fig. 4.) 
Shell of moderate or small size, strongly convex and arched, 
somewhat wider than long, with very short hinge and rounded angles ; 
ventral valve tumid, especially in the umbonal region, with an undefin- 
ed sinus extending from the produced basal margin half way to the 
beak ; general outline of valve rhombic ovate, the rounded hinge ex- 
tremities being slightly above the middle of the height ; suface marked 
by numerous (about 20 in adults,) rounded concentric folds and very 
fine somewhat irregular radiating striae (in the cast), the summit of the 
folds ornamented by numerous pointed perpendicular spines in one 
row. The cast is marked by the impression of a median plate extend- 
ing one-third the height upon the umbo. Height, 19 mxin., width, 21 
mm. 
The species is especially characterized by the very high incurved 
beak, proportions, and surface characters. From S. hirtus if differs in 
its relatively greater height and larger size. See Plate iii, Vol. hi. In 
the same way it differs from S. pseudolineatus. It is much more near- 
ly like S. setigerus, H. from the Chester, from which it is strangely di- 
ficult to separate it. The beak is higher, however, and the concentric 
wrinkles more marked. Spirifer praematura of the Chemung may 
prove more nearly allied than appears from published descriptions. 
[Compare Pal. N. Y. , Vol. IV., p. 250, et seq.] 
SPIRIFER DELTOIDEUS, S}». n. 
(Plate II, Fig. 7.) 
Our material is still too’ imperfect to make possible a complete 
characterization of this species referred to on page 45, Bui. Den. Univ. 
vol. hi., but the examination of additional material leaves no doubt as 
to the specific difference of the form from S. striatiformis and S. mar- 
ionensis. From the last mentioned species it obviously differs in its 
more triangular outline and rounded ears, as well as its more elevated 
