REPORT OF THE STATE PALEONTOLOGIST I903 253 



Cyrtina rostrata (Hall) 

 One entire specimen and two well preserved pedicle valves foiuid 

 in the Lower Oriskany. 



Coelospira acutiplicata (Conrad) 

 A'ery abundant in the lowest Onondaga directly above the Esopus- 

 Schoharie. An average shell measured lomm by 12mm by 4mm in 

 length, breadth and thickness. This frequently occurs in the con- 

 dition of pyrite casts. 



C. concava Hall 



One of the most abundant shells in the whole New Scotland forma- 

 tion, making up in places the entire rock mass ; it is alsO' one of the 

 most characteristic species of the Port Ewen and is likewise well 

 represented in the Coeymans. One brachial valve, 6mm by 7mm in 

 length and breadth, from the Onondaga, seems to be identical with 



this species. 



C. dichotoma Hall 



Almost as abundant in the Upper Oriskany as L . f 1 a b e 1 - 

 1 i t e s . 



C. grabaui sp. n. 



Shell subovate in outline; marked by 9 plications on each valve. 

 These plications are moderately prominent, and broadly rounded 



Fig. 8 Coelospira grabaui Shimer, 



near the front of the shell, decreasing in strength toward the cardi- 

 nal extremities. The median depression of the pedicle valve is 

 very deep from the center of the valve to the front, and contains a 

 single plication which fades away toward the front. This produces 

 a correspondingly accentuated elevation on the anterior portion of 

 the brachial valve which has a strong depression down the center, 

 thus forming two median plications, which, however, become 

 merged into one at the front of the shell. The fold disappears at 



