1870.] 
251 
t Winch ell. 
pulchella, Win. The type-specimens of C. geniculata are from Clarksville, 
Mo;, and, besides presenting the characteristic geniculation in the ventral 
valve, appear to have a rather shorter hinge line than these specimens. 
Chonetes Illinoisersis, Wortlien (Trans. St. Louis Acad. Sci. I, 571). 
Occurs in bed ISTo. 5, Rockville, Ohio. 
Hemipronites ineqtjalis, Hall sp. (Io. Geol. Rep. 490, pi. ii, fig. 6, 
a—c.) Collected by Rev. H. Herzer, at Newark, Ohio, and by Prof. An¬ 
drews, at Granville. Collected, also, by the latter in Pennsylvania, near 
Shafer’s. 
IIemipronites umbraculum' ? Schlotli. (Die Petrefact. I, p.256, and 
II, p. 67.) 
Collected by Rev. H. Herzer, at Newark, Ohio, and by Prof. Andrews, 
in bed No. 4, at Sciotoville and bed No. 5, Rockville, and also, near 
Shafer’s, Penn. 
It may well be doubted whether the large specimens ranging through 
the equivalents of the Marshall group, in the Western States, really be¬ 
long to the foreign species to which they have generally been referred. 
Orthis subelliptica ? W. & W. (Bos. Proc. VIII, 292.) From bed 
No. 4, Sciotoville, Ohio. A single imperfect specimen. 
Orthis Michelpni ? L’Eveille. 
From bed No. 5, Rockville, Ohio ; from Granville, Licking county; 
from Vinton county; and also, from near Shafer’s, Penn. 
The specimens from all these localities agree with each other and with 
specimens commonly referred to 0 . Michelini. It is a form probably iden¬ 
tical with that from Clarksville, Mo., referred to 0 . Vanuxemi , by Prof. 
Hall. The smaller, flattened specimens approximate 0. flava, Win., from 
the Burlington Sandstone, while a large, transversely oval specimen 
from Rockville, approaches 0 . resnpinaia , except in much smaller size. 
In the considerable convexity of some of the dorsal valves (especially from 
Shafer’s), and also in the cast of the muscular scars, they differ from 0. 
impressa, Hall. If there are any permanent specific distinctions among 
the widely extended American forms commonly referred to 0 . Michelini, 
it will require extended and careful comparisons to make them out. 
Spirifera hirta? White & Whitfield. 
The single specimen from silicious Shales, Tennessee, is considerably 
larger than specimens from Burlington, Iowa, the typical locality, and 
perhaps the area is a little more extended laterally. 
Spirifera extenuata, Hall (Howa Rep. 520, pi. vii, fig. 6). Collected 
by Rev. H. Herzer and Prof. Andrews, at Newark, O. 
Spirifera Waverlyensis, n. sp. 
Shell semi-circular, without, plications (on the cast). Ventral valve 
with an elevated, nearly fiat, transversely furrowed and vertically striated 
area, reaching the whole length of the hinge-line, which is scarcely less 
than the greatest width of the valve. The plane of the area forms a right 
angle with the plane of the valve. Surface more rapidly convex near the 
margin than between the beak and the middle ; lateral slopes, also, gent¬ 
ly convex. Sinus deep, well defined, occupying nearly one-fourth the 
