420 PALEONTOLOGY OF NEW YORK. 



This species differs from P. Hero in the more numerous, more rounded and 

 more closely arranged radii. 



Formation and locality. In a limestone of the Marcellus shale, Stafford, Gen- 

 esee county, N. Y. 



PaNENKA LiNCKLiENI. 



PLATE LXIX, nUS. 12-14. 



Cardtola Liiu-kUBni (Hall), S. A. Millkr. Cat. Am. Pal. Foss., i>. 18G. 1877. 



" f " " Pal. N. Y., vol. V, pt. 1. Plates and Explanatiorhs : PI. 69, figs. 12-14. 1883. 



Shell large, sub-orbicular or broadly ovate ; length about one-fourth greater 

 than the height. Pallial margin regularly curving, somewhat flattened along 

 the base and extended posteriorly. 



Valves moderately convex below, gibbous in the middle and above. The 

 specimens usually occur in the soft shale and are extremely flattened. 



Hinge-line short. 



Beaks sub-central, elevated, directed forward and incurved. 



Surface concentrically striated and marked by about thirty, broad, flattened, 

 radiating plications, with sometimes intermediate smaller ones, which arise 

 upon the umbo and continue to the basal margin. The intermediate radii 

 are sometimes confined to the anterior and posterior portion of the shell, but 

 often occupy the entire disc. 



Three specimens measure respectively 63, 84 and 96 mm. in length, and 

 52, 63 and 73 mm. in height. 



This species is distinguished for its large size, and broad, flattened radii. 

 Formation and- localities. In the Marcellus shale, Flint creek, near Phelps, 

 Ontario county, the Indian Reservation near Buffalo, and at Avon, N. Y. 



Panenka mollis, n. sp. 



PLATE LXXX, FIGS. 8 (9?). 

 Oardiolaf , Hall. Pal. N. Y., vol. v, pt. I. Plates and Explanations : PI. 80, dg. 8. 1883. 



Shell of medium size, broadly obovate, length and height nearly equal. Pallial 

 margin regularly rounded, a little truncate on the posterior slope. 



