A Contribution to the Lower Devonian Faunas of Maryland 39 



Occurrence. — Oriskany Formation, Eidgely Member. Cumberland 

 (fide Hall). 

 Collection. — American Museum of jSTatural History. 



Strophostylus matheri Hall 

 Plate LXXXVI, Figs. 8, 9 



StropJiostylus matheri Hall, 1859, Nat. Hist. N. Y., Pal., vol. lii, p. 471, pi. 

 cxvill, 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. Aperture 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. 



Genus DIAPHOROSTOMA Fischer 



DiAPiroROSTOMA VENTRIC0SU3I (Conrad) 



Plate LXXXVII, Figs. 1, 2 



Platyostoma ventricosa Conrad, 1842, Jour. Acad. Nat. Scl., Phila., vol. viii, 



p. 275, pi. xvil, fig. 5. 

 Platyostoma ventricosa Hall, 1859, Nat. Hist. N. Y., Pal., vol. lii, p. 300, pi. Iv, 



figs. 9a, b, c, d; p. 469, pi. cxii, figs. 1-10; pi. cxiii, figs. 7, 8; pi. cxv, fig. 8, 



1861. 

 Platyostoma ventricosa Nicholson, 1874, Kept, upon the Pal. of Province 



of Ontario, p. 117, pi. ii, fig. 4. 

 Diaphorostoma ventricosum Clarke, 1900, Mem. N. Y. State Mus., No. 3, vol. 



iii, p. 30, pL iii, figs. 25-28. 

 Platyostoma ventricosa Weller, 1903, Geol. Survey, N. J., Pal., vol. iii, p. 361, 



pi. xlix, figs. 7-11. 



