Maryland Geological Survkv 481 



StROPHOSTYLUS MATPIEKI Hall 



Plate LXXXVI, Figs. 8, 9 



Strophostylus matheri Hall, 1859, Nat. Hist. N. Y., Pal., vol. iii, p. 471, pi. 

 cxviii, figs, la, b, 1861. 



Description. — " Shell obliquely ovoid or subglobose ; the spire elevated : 

 volutions about four, the last comprising almost the entire bulk of the 

 shell. iVperture subcircular, a little higher than wide : peristome con- 

 tinuous, thin, joining the adjacent volution on the lower side or becoming 

 free on the posterior side, and joining the outer margin of the columellar 

 lip. Volutions very symmetrically decreasing: suture canaliculate; the 

 depression deepening towards the last volution, till, in older forms, the last 

 volution is sometimes quite free at the aperture. Surface marked by fine 

 transverse striae, which, in older specimens, become towards the aperture 

 elevated, lamellose, and imbricating." Hall, 1859. 



Hall's type specimen of this species came from Cumberland. The writer 

 has seen but a single individual. 



Length 2.5 cm. ; diameter 2.4 cm. 



Occurrence. — Oriskany Formation, Eidgely Member. Cumberland, 

 east side Nicholas Mountain. 



Collection. — Maryland Geological Survey. 



[Ohern.] 



Strophostylus andrewsi Hall 



Plate LXXXVI, Fig. 10 



Strophostylus andrewsi Hall, 1859, Nat. Hist. N. Y., Pal., vol. iii, p. 472, pi. 

 cxviii, fig. 2, 1861. 



Description. — " Shell somewhat semiovoid. Spire very slightly elevated 

 above the last volution, which is extremely ventricose: aperture sub- 

 circular, a little higher than wide ; peristome very oblique to the axis of 

 the shell, expanding over the inner side of the previous volution, but not 

 continuous with the outer edge of the columellar lip, which is angular, 

 the lip short, and tenninating abruptly below. Surface marked by fine 

 equal striaj." Hall, 1859. 



Length 2.5 cm. ; diameter 3.5 cm. 



Occurrence. — Oriskany Formation, Eidgely Member. Cumberland 

 (fide Hall). 



Collection. — American Museum of Natural History. 



