Xe/r Species nf Fossils fn.nii Olu'n. '-Idl 



Loxoiieuia plicatum, u. sp. 



Pal. O., Vol. Ill, Plate 11, Figs. 14 and I'J. 



Shell small and slender, spire elevated, presenting an apical angle of 

 about fifteen degrees ; composed of about eleven volutions, in the example 

 used and illustrated, which are flattened on the surface in the direction of 

 the spire, and marked by strong vertical plicae, vi'hich are directed a little 

 forward in their passage across the volution from above downward. The 

 body or largest volution, counting from the lip backward, contains fifteen 

 of these plications, and the volutions above contain nearly the same num- 

 ber ; those of the several volutions being in line with those on the one below, 

 but set enough back of it to be in line with the slope of the plication. This 

 gives them a somewhat spiral arrangement on the shell, the whqle having 

 a twist of about one-fourth of one turn in the length of the shell. On the 

 last volution the plicae are not distinct much below the bulge of the whorl. 

 Aperture elongate and pointed below. Suture distinct, but not grooved or 

 banded. Columella straight, about half as long as the aperture, solid, and 

 terebra-like : shell without uml)ilicus. 



The species belongs to a groap of the genus which has but 

 few representatives in our Coal-measures ; and even those that 

 are nearest allied to it appear to differ in the form of the colu- 

 mella, which is somewhat peculiar ; and if other species should 

 appear presenting these same characters, it may be necessary to 

 separate them generically from, the true Loxonema. 



Formation and Locidity. — lu the Coal-measures of Carbon 

 Hill, Hocking Co., Ohio. Collected by H. Moores, Esq. 



CEPHALOPODA. 

 J\'aiitilii8 Ortoni, n. sp. 



Pal. O., Vol. Ill, Plate 12, Fig. 20. 



Shell of medium size, and consisting of about two and a half or three 

 closely coiled volutions, but which are not at all embracing ; the outer one 

 being simply in close contact with the medio-dorsal portion of the next 

 within, and exposing nearly the entire dorso-ventral diameter of the shell. 

 Volutions transversely sub-pentangular, being angularly convex on the 

 back, strongly sub-angular on the sides, and concave on the abrupt umbili- 

 cal slope, which forms a somewhat sigmoidal curve resembling an ogee 

 moulding, while the slightly concave ventral surface is quite narrow, and 

 forms a fifth surface. Lateral angles obtuse or round sub-angular, and 

 ornamented by a series of nodes which are strong and very distinct on the 

 inner coil, broad and rounded on the first part of the last volution, and be- 

 come obsolete on the outer third. The substance of the shell has been very 

 thick and strong, and the surface shows no evidence of growth-markings or 

 strise. Septa and other internal features unknown. 



k 



