1870 .] 
257 
[Wincliell. 
lamellar stria; of growth indicating a coarsely and unequally crenate 
aperture. 
Of this species two varieties may he recognized : (A) The typical form, 
differing from.P. pciralium, W. & W., in its excentric apex ; (B) A form 
less profoundly plicated—perhaps because younger specimens. These 
forms I was at first inclined to regard as varieties of P. haliotoides, M. & 
W., but I believe the departures are too extreme and the mutually-con¬ 
curring specimens too numerous for specific identity with the Illinois 
forms. 
The largest specimens, when resting on the aperture, are an inch in 
height ; the transverse diameter of the aperture is five-sixteenths of an 
inch, and the dorso-ventral diameter six-sixteenths. 
Quite abundant at Newark, Ohio. 
Platyceras haliotoides, M. &. W. (Ill. Geol. Rep. 458, pi. xiv, fig. 3). 
From Newark, Ohio. 
Pleurotomaria Hickmanersis, Win. (Tenn. Geol. Rep). 
Globose shells in an incomplete state of preservation, showing regularly 
convex whorls ornamented with numerous delicately raised and finely 
beaded revolving striae, and a w T ell-defined band, without distinct carina. 
The striae limiting the band are not beaded, but all the others, on both 
sides, bear 50 to 60 granulations to the inch. The striae are quite unequal 
in number and distribution^ since they increase by implantation, with the 
growth of the shell. The base of the shell is about an inch im diameter, 
and seems to be perforated by a small umbilicus. 
From dark, bituminous shales, Hickman county, Tennessee. 
Pleurotomaria vadosa, Hall (XIII. Rep. N. Y. Regents, p. 108.) 
Numerous casts occur in bed No. 4, Sciotoville, Ohio, which are quite 
identical with casts from Michigan. Some imperfect moulds, larger than 
the typical forms, occur also in bed No. 5, Rockville, Ohio. 
Murchisoria prolixa, W. & W. (Proc. Bos. Soc. N. H. VIII, 303.) 
Bed No. 4, Sciotoville, Ohio. 
Murchisoria quadricircta, Win. (Proc. Acad. N. S., Phil. Jan. 
1863, p. 19.) Bed No. 4, Sciotoville, Ohio. 
Bellerophor cyrtolites, Hall. (XIII. Rep. N. Y. Reg.) 
A. single imperfect specimen from Granville, Ohio. 
Corularia byblis, White. (Proc. Bos. Soc. N. H., Feb. 1862, p. 22.) 
From dark, bituminous shales, Hickman county, Tennessee. 
I feel no doubt of the identity of this species. It possesses the same 
small isolated eminences or granulations ranged in a line along the crests 
of the ridges, which cliaracterize well preserved specimens from Burling¬ 
ton, Iowa. From 60 to 75 of these eminences may be counted in the space 
of an inch. 
Dr. White does not mention these granulations ; only stating, “spaces 
between the ridges finely crenulate.” Worn specimens develop a series 
of transverse bars between the ridges, which undoubtedly correspond in 
position with the granulations seen in unworn specimens. Compare with 
this species, G. Gervillei d’Archiac et Vern., Mem. Foss. Rhenish Prov. 
in Trans. Geol. Soc., Lond., vol. YI, p. 351. 
i 
