1S70.] ^^ * [Winehcll. 



lamellar striai of growth indicating a coarsely and unequally crenate 

 aperture. 



Of this species two varieties may he recognized : (A) The typical form, 

 differing from P. paralium, 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. Tialiotoides, M. & 

 W., hut I believe the departures are too extreme and the mutually-con- 

 curring specimens too nmnerous for specific identity with the Illinois 

 forms. 



Tlie 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. 



Plattcekas haijotoides, M. &. W. (111. Geol. Eep. 458, pi. xiv, fig. 3). 

 From Newark, Ohio. 



Pleurotomaria PIickmakejS'sis, Win. (Tenn. Geol. Eep). 



Globose shells in an incomplete state of preservation, showing regularly 

 convex whorls ornamented with numerous delicately raised and finely 

 beaded revolving strias, and a well-defined band, without distinct carina. 

 The striaj limiting the band are not beaded, but all the others, on both 

 sides, bear 50 to 60 granulations to the inch. The strise 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 in diameter, 

 and seems to be jjerforated 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. 



MuRCHisoKiA PROLixA, W. & W. (Proc. Bos. Soc. N. H. YIII, 303.) 

 Bed No. 4, SciotoviUe, Ohio. 



MuRCiiisoNiA qxjadricijSCTa, Win. (Proc. Acad. N. S., Phil. Jan. 

 18G3, p. 19.) Bed No. 4, Sciotoville, Ohio. 



Bellerophon cyrtolites. Hall. (XIII. Rep. N. Y. Reg.) 



A single imperfect specimen from Granville, Ohio. 



Cokitlaria btblis. 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 characterize well i^reserved 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, C. Qermllei di.^ Ajcchidto, et Vern., Mem. Foss. Rhenish Prov. 

 in Trans. Geol. Soc, Lond., vol. VT, p. 351. 



