Contributions to Invertebrate Palseontology . 601 



larity, I procured the loan of the type specimen, which with but 

 little cleaning shows the eolumellar fold as strongly developed as 

 any of the Ohio specimens. 



Formation and Locality. — In the Coal Measure strata at Carbon 

 Hill, Hocking Co., Ohio. Collected and presented by Mr. H. 

 Moores, of Columbus, Ohio. 



Genus LOXOlVEItlA Phillips. 



L.oxonema plicattim. 



Plate XV, figs. 14 and 15. 

 Loxonema plicatum Wliitf., Ann. N. Y. Acad. Scl., 1882, p. 231. 



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, which 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 number ; 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 whole 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 umbilicus. 



The species belongs to a group 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 columella, 

 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 Locality. — In the Coal Measures of Carbon Hill, 

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



CEPHALOPODA. 

 Genus NAlJTILrS Breyn. 



Nautilus Ortoni. 



Plate XVI, fig. 20. 

 Nautilus Ortoni Whitf., Ann. N. Y. Acad. Sci., 1882, p. 231. 



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 

 Amnals N. Y. Acad. Sci., V, Feb. 1891.— 40 



