422 PALAEONTOLOGY OF NEW YORK. 



Panenka potens, n. sp. 



PLATE LXIX, FIGS. 8, 10. 



In part Oardiolaf radians (Conrad), Hall. Pal. N. Y., vol. v, pt. 1. Plates and Explanations: PI. 09, 



figs. 5-11. 1883. 



Shell large, obliquely broad-ovate ; anterior end expanded ; length greater 

 than the height. Pallial margin regularly curving along the posterior end, 

 a little truncate on the base and more narrowly rounded in front. 



Valves moderately convex below, becoming gibbous or ventricose in the 

 middle and above. 



Hinge-line one-third the length of the shell. Ligamental area long and 

 narrow. 



Beaks large, prominent and incurved over the hinge-line. 



Surfjice concentrically striated and marked by from thirty-five to forty 

 rounded, rarely duplicate plications, with narrower or sub-equal interspaces. 



A specimen has a length of 80 mm. and height of 64 mm. 



This species differs from P. radians in its more ovate, less nearly equilateral 

 form, and in the more simple radii. 



Formation and localities. In the shales of the Hamilton group at Cazenovia 

 and other localities in Madison county, N. Y. 



Panenka radians. 



PLATE LXIX, FIG 9. 



PUrinea radiaim, Comrad. Jour. Acad. Nat. Sci. Phila., ]). 252. PI. 1.5, fig. 1. 1842. 

 Monotis radiatm (Conrad), 8. A. Millkr. Cat. Am. Pal. Foss., p. 196. 1877. 

 Cardiola radiann (Hall), S. A. Millbr. Cat. Am. Pal. Foss., p. 186. 1877. 



In part Oardiolaf radians (Conrad), Hall. Pal. N. Y., vol. v, pt. 1 Plates and Explanations: PI. 69, 



figs. 5-11. 1883. 



Shell large, brofidly ovate or sub-circular; length greater than the height. 

 Pallial margin regularly curving, broader anteriorly. 



Valves moderately convex in the lower portion, becoming gibbous in the 

 umbonal region. 



Ligamental area narrow. 



