OKISKANY SANDSTONE. 479 



Cyrtolites? expansus ( n. s.). 



Plate CXIV. Fig. 4 & 5. 



Shell obliquely depressed-conical ; the apex incurved, but making scarce- 

 ly, or no more than, a single volution, very rapidly expanding from the 

 apex ; the body ventricose, subcarinate on the dorsum : aperture nearly 

 circular. 



Sprface of cast marked by faint transverse ridges and finer longitudinal 

 strisB. 



I have seen but two specimens of this fossil, the smaller of which is more angular 

 in outline, and the dorsal carination stronger; while there are distinct indications 

 of two sets of surface markings, the annulations being stronger towards the apex. 

 The larger specimen shows no marks of striae, but is contracted near the aperture. 

 The smaller specimen has the aspect of Cyrtolites omatus of Conrad, but is a broader 

 and less convoluted shell : the determination, however, is by no means satisfactory. 



Fig. 4 a, b. Anterior and lateral views of the smaller specimen. 

 Fig. 5 a, b. Anterior and lateral views of the larger specimen. 



Geological position and localities. In the Oriskany sandstone : Albany and Scho- 

 harie counties. 



PTEROPODA[l]. 

 Coiiularia lata. 



Plate CXI. Fia. 1 ; and Plate LXX A. Fia. 3 a, b. 



Shell elongate, extremely broad : sides slightly convex ; angles rounded, 

 not deeply sulcate, without sulcation on the middle of the sides ; trans- 

 verse ridges curving into the sulci of the angles, and directed gently 

 downwards to the middle of each side, where they bend upwards at a 

 very obtuse angle : ridges crested by rounded or transversely elongated 

 nodes or pustules, which are sometimes punctured at their extremities. 

 Longitudinal strise not determinable, except upon the angles. 



