LAMELLIBRANCHIA TA. 
417 
Test marked by numerous sub-angular radii; on the umbo, each third 
or fourth one being stronger than the others, becoming equal and rounded 
below. 
The specimen described has a length of about 110 mm. and a height of 
97 mm. 
This species is distinguished by its large size, moderate convexity and the 
alternation of the radii in the umbonal region. 
Formation and locality. In the Corniferous limestone, near Columbus, Ohio. 
Panenka multiradiata, n. sp. 
PLATE LX1X, FIG. 5 ; AND PLATE XCIV, FIG. IS. 
In part Ccirdlola radians (Conrad), Hall. Pal. N. Y., vol. v, pt. 1. Plates and Explanations : PI. 69, figs. 
5-11. 18S3. 
Shell large, sub-circular or broadly ovate; length greater than the height. 
Pallial margin regularly rounded from the anterior to the middle of the- 
posterior end, whence it is a little more abruptly curving to the post-cardi¬ 
nal extremity. Anterior end short and regularly rounded. Posterior end 
expanded. 
Valves regularly convex below, becoming gibbous or ventricose in the 
middle and above. 
Hinge-line short, straight. Ligamental area short and high. 
Test thin. Surface marked by numerous, closely arranged, flattened or 
convex radii. 
The specimen described has a length of 65 mm. and a height of 57 mm. 
Formation and locality. In the limestone of the Upper Helderberg group, at 
Clarence Hollow, Erie county, N. Y. 
Panenka ventricosa. 
• PLATE LXIX, FIGS. 1,2. 
Cardiola? elevata, Hall. Pal. N. Y., vol. v, pt. 1. Plates and Explanations: PI. 69, figs. 1, 2. 1883. 
Not Mmot'is elevata , Conrad. Proc. Acad. Nat. Sci., Phila., vol. iii, p. 23. 1846. 
Shell of medium size or larger, sub-circular; length greater than the height. 
Pallial margin regularly curving. Anterior end large. 
