GASTEROPODA. 97 



Volutions somewhat flattened in the dorso-ventral direction ; the outer volution 

 expanded laterally, so that the width near the aperture is more than two and 

 a half times as great as the height. The last half of the outer volution is 

 ohtusely angular on the dorsum (becoming rounded on the inner half), 

 indicating a carina upon the exterior shell ; and the aperture has apparently 

 been deeply sinuate. 



This form was originally included under B. Pelops, but a careful comparison 

 shows the following differences : The outer volution near the aperture is more 

 expanded laterally, the dorsal ridge is not continued backward as in the 

 typical forms of B. Pelops, the inner volutions are more fully exposed, and the 

 lateral margins of the outer volution are more angular. The only specimen 

 of this form observed is much larger than the ordinary specimens of B. Pelops. 



Formation and locality. In limestone of the Upper Helderberg group at 

 Clarence Hollow, Erie county, N. Y. 



Bellerophon Newberryi. 



PLATE XXII, FIGS. 15, 16 ; AND PLATE XXVI, FIGS. 2, 3. 



Bellerophon paining, H. & W. Twenty-fourth Rep. N. Y. State Mus. Nat. Hist., p. 200. 1872. 



" '• " Hall : Illustrations of Devonian Fossils : Gasteropoda, pi. 22. 187(5. 



Not Bellerophon patulns. Hall. Geol. ofN. Y. Surv. Fourth Geolog. Dist. 1843. 



Descriptions of New Species of Fossils, etc. 

 Fifteenth Rep. N. Y. State Cab. Nat. Hist. 

 Bellerophon Newberryi, Mkek. Proceedings Acad. Nat. Sci. Phila., p. 77. 1871. 



•♦ " " Geological Survey of Ohio. Palaeontology, vol. 1, p. 222. 1873. 



Shell subglobose. Volutions covered, and the umbilicus closed or rarely per- 

 ceptible ; dorsum somewhat depressed-convex, with a faint depression 

 along the median line. Aperture much expanded, reniform, more than 

 twice as wide as the dorso-ventral diameter ; the outer lip expanded 

 (dimensions unknown), spreading laterally, and joining a strong callus of 

 the columellar lip, recurves, inclosing and partially or entirely covering 

 the umbilicus. Callus of the inner lip thick and strong, essentially flat- 

 tened and spreading outward almost rectangularly to the direction of the 

 13 



