556 GEOLOGY OF OHIO. 



point where the flat sides of the shell curve rapidly inwards so as to form 

 the mouth. Since this is the line of junction for successive whorls the 

 curvature of the striae can only be noticed along the lower side of the 

 last whorl, but over the main body of the shell only straight strise appear 

 It was the decidedly flattened sides of this shell, and the straight striae, 

 showing no trace of even a very obtuse sinus which forbad the reference 

 of this specimen to Loxonema or any other genus having a sinus. Some 

 published figures of Polyphemopsis, such as P. niliduia seemed to show 

 at least a strong external resemblance. No notch in the lip was noticed. 

 There is a resemblance also to such forms as Eunema cerithioides, Salter, 

 which however seems to differ considerably from the type of the genus, 

 E. strigidata, Salter. There is also a certain similarity with Orthonema 

 conicum, Meek and Worthen, which differs however from the more typi- 

 cal species of this genus (if the fig. 5a of Plate 29, Geol. Surv. Illinois, 

 vol. 5, be taken as the type of this species), in the absence of more or 

 less strong striae, usually one above and one below the suture lines be- 

 tween the successive whorls. The above reference to Polyphemopsis 

 seemed therefore the best possible one under present circumstances, 

 though not made with confidence. 



Loxonema? (cf. Holopellm) subulata, Conrad. 



(Plate 30, Fig:. 21.) 



The generic reference of these specimens is doubtful. In the Pro- 

 ceedings of the Boston Soc. of Nat. Hist., 1889, a specimen from Todd's 

 Fork, Ohio, was described, which showed traces of transverse striae in 

 the last whorl, of such a kind as to preclude the idea that a slit, even a 

 very shallow obtuse one, had ever been present. This would shut it out 

 from Loxonema, and hence these shells are rather doubtfully referred 

 to that genus. . At Huffman's Quarry specimens were found whose re- 

 lationship to the Todd's Fork specimen is undoubted, although only in 

 the form of a cast. One specimen was about 25 mm. long. The Ohio 

 specimens seemed to have the whorls less oblique than the forms figured 

 from New York, and hence the whorls are less frequent in the same dis- 

 tance, but this may not indicate a different species. 



Paleopupa abrupta, gen. et sp. nov. 



(Plate 37-a, Figs. 21 a, b.) 



The material serving for the description of the species is a single 

 shell and a cast of a second, neither one perfect. It is with diffidence, 

 therefore, that a new generic term is established. The reason lies in the 

 failure to discover any old genus to which it seemed to have clear affin- 

 ities. The spire is sinistral. The last two whorls do not differ greatly in 



