14 Calciferous of the Mohawk Valley 126 



outer edge very acute, the inner rounded, the upper surface some- 

 what angulate next to the suture. The margins of the umbilicus 

 are angular; umbilicus about one-third the width of the shell. 

 Apical angle 130°. 



This species resembles /?. pmvium, Whitfield, but differs in 

 its smaller size and more obtuse apical angle. 



Many of the specimens of this species are much water worn 

 and are found associated with flat, water-worn pebbles. 



Locality, — Very common in V 2 at Ft. Hunter, N. Y. 

 MURCHISONIA D' Archiac and Verneuil 



Murchisonia mohawkensis, n. s., Fl. 15, fig. 13 



Shell elongate, turbinate, spire somewhat rapidly ascending; 

 volutions obtusely angular along the middle. None of the speci- 

 mens show the complete shell or the surface markings. The spe- 

 cific characters are such that it cannot be included in any de- 

 scribed species. Diameter of shell at the lowest whorl 6 mm. 



Locality. — A very rare fossil. Found on the weathered sur- 

 face of a slab found near the top of No. V. 2, associated with 

 Ribeiria (.^) nuculitiformis , Pleurotomaria floridensis and Ecculiom- 

 phaliis inultise.ptariiis. 



BELLEROPHON Montfort 



Bellerophon calcifer, n. s., PI. 15, figs. 15, 16, 17, iS 



Shell discoid. Six whorls are exposed in one specimen, but 

 the number is usually less. Dorsupi angulate. Vertical diam- 

 eter of the specimen figured 8 mm. Umbilicus large, apparently 

 exposing all of the whorls; width 3% mm. 



B. macer, Billings, resembles this .species, but is larger, has 

 a smaller number of whorls and a narrower umbilicus, otherwise 

 the resemblance is strong. This species is extremely variable, 

 approaching B. subovata in its ventricose forms, with a narrow 

 umbilicus. 



I^ocality. — No. V 2 of the Ft. Hunter sedlion. 



