422 
PALAEONTOLOGY OF NEW YORK. 
Panenka potens, n. sp. 
PLATE LXIX, FIGS. 8, 10. 
In part Cardiola ? radians (Conrad), Hall. Pal. N. Y., vol. v, pt. 1. Plates and Explanations: PI. G9, 
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. 
Surface 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 kalians. 
PLATE LXIX, FIG 9. 
Pterinea radians, Conrad. Jour. Acad. Nat. Sci. Phila., p. 252. PI. 15, fig. 1. 1842. 
Monotis radians (Conrad), S. A. Miller. Cat. Am. Pal. Foss., p. 196. 1877. 
Cardiola radians (Hall), S. A. Miller. Cat. Am. Pal. Foss., p. 186. 1877. 
In part Cardiola? radians (Conrad), Hall. Pal. N. Y., vol. v, pt. 1 Plates and Explanations: PL 69, 
figs. 5-11. 1883. 
Shell large, broadly 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. 
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