226 yew Species uf Fossils from 07/ io. 



carina between the lines of nodes marking the dorsum. It also 

 differs in the alternating positions of the nodes. 



Foiiiiation ami LocalUij. — In the Maxville limestone at Nevv- 

 tonville, Ohio. Collection of Columbia College, N. Y. 



CEPHALOPODA. 



Nautilus pauper, n. sp. 



Pal. O., Vol. Ill, Plate 10, Fig. >^3. 

 Shell somewhat below the medium size, and consisting of about two and 

 a half volutions, which increase rather rapidly in size, and are so coiled 

 as to expose almost the entire diameter of the inner coils in the umbilical 

 cavity ; the outer one embracing only the dorsal surface of the inner volu- 

 tion. Volutions quadrangular in form, with the lateral diameter only 

 about two-thirds as great as the dorso-ventral diameter ; while the dorsal 

 and ventral surfaces are nearly vertical to the plane of the sides, so far as 

 can be determined from the specimen in hand ; or possibly the dorsal sur- 

 face may be slightly rcmnded. The sides of the shell are marked by a 

 faint, narrow, revolving sulcus bordering the margin of the umbilicus, and 

 by a correspondingly faint ridge close to the dorsal margin ; while a much 

 stronger rounded ridge occurs on the surface at about one-third of the 

 width of the volution from the dorsal border. Internal features of the 

 shell not known. 



A single individual only of the species has been observed, and 

 is altogether too imperfect to reveal all the features. It consists 

 of tlie non-septate portion of the shell, in the conditi(m of an 

 internal cast, with the impression of one side of the entire shell ; 

 but gives no indications of the sejjta themselves. The only fea- 

 tures indicating its cephalopodous nature, upon which one can 

 rely, are its symmetrical form, and the evidences of a similar 

 ornamentation on the opposite sides; otherwise it might have 

 been supposed to represent a form of Euomplialus. 



Formation and Locality. — In the Maxville limestone (Ches- 

 ter), near Enshville, Ohio. Collection of Prof. E. B. Andrews. 



Fossils from the Coal Measures. 



CEINOIDEA. 

 Cyathocrinus Somersi, n. sp. 



Pal. O., Vol. Ill, Plate 11, Figs. 4 and 5. 

 Calyx very shallow, being low and spreading; the extreme height to the 

 top of the tirst radial plates not exceeding one-fourth of the diameter ; the 



