Maryland Geological Survey G6T 



Bellkkopiion sp. 



Description. — Fragments show tlie iJix'sence of one or two species of 

 Bellerophon distinct from the foregoing but insufficient for identification. 

 One of these is broad and stout with a well-marked stomal callous, an- 

 other much narrower and both with an apparentl}' snmoth exturim'. 

 These are from conglomerate near the top of the formation. 



Occurrence. — Jennings Formation, Chemung Member. Sideling 

 Hill Creek. 



Collection. — Maryland Geological Survey. 



Genus BUCANOPSIS Uliich 

 BucANOPSis M.BRA (Conrad) 

 Plate LXVII, Figs. 21, 22 



Bellerphon mara Hall. 1S76, Illus. Devonian Foss. Gastropoda, pi. xxii. 



Bellerphon neleus Hall and Whitfield, 1876, Hlus. Devonian Foss. Gastro- 

 poda, pi. xxii. 



Bellerphon mwra Hall, 1879, Pal. of N. Y., vol. v, pt. ii, p. 119, pi. xxv, figs. 

 9-14; pi. xxvi, figs. 19-24. 



Description. — "Shell subgiobose, or broadly subovoid ; length about 

 equal to the greatest width at the aperture ; in imperfect specimens the 

 width is usually greater than the length. Inner voh;tions small and 

 gradually enlarging to the third, which is more rapidly expanded, the 

 exposed portion of the outer one being extremely ventricose. Aperture 

 greatly expanded, the peristome broadly sinuate in front and auriculate 

 at the sides; somewhat thickened and repand as it approaches the um- 

 bilicus, over whicli it extends, continuing in a thickened callosity across 

 the columellar side. The dorsum is marked by a distinct carina and the 

 entire surface by strong pustulose strias, or rows of pustules, which are 

 arranged along lines parallel to the stri;i? of growth. The dorsal carina 

 is also pustulose. These markings are somewhat less conspicuous on the 

 anterior and lateral margins of the shell. This fossil, when entire, pre- 

 sents a strong rotund form until near the aperture, where it becomes 

 abruptly expanded. The shell is thick, and the surface comi)letely stud- 

 ded with rows of pustules which, in one direction, are arranged in series 



