Maryland Geological Survey 223 



the New York specimens is but imperfectly shown, if at all, on these 

 specimens. But the following distinctive characters are present: sub- 

 central beaks; subemarginate posterior end; oblique depression extending 

 from the beak to the posterior margin; large rounded anterior end; fine 

 concentric and, on part of the specimens, fine distant radiating striae. 



Length of three specimens, 23, 30 and 33 mm.; height, 12, 17, and 20 

 mm. 



Occurrence. — Eomney Formation, Hamilton Member. Williams 

 Road, 3-| miles southeast of Cumberland; east bank Evitts Creek below 

 Wolfe Mill; on Oldtown Eoad, east of Maryland Ave., Cumberland; W. 

 Va. side Potomac Kiver about 3 miles south of Cumberland. 



Collections. — Maryland Geological Survey ; Few York State Museum ; 

 American Museum of Natural History. 



Family CARDIOLIDAE 



Genus PANENKA Bariande 



Panenka alternata Hall 

 Plate XXIV, Fig. 1 



Panenka alternata Hall, 1885, New York State Geol. Surv., Paleontology, 

 vol. v, pt. i, Lamellibr., pp. 416, 417, text fig. 462. 



Description. — Shell very largo, with broadly ovate outline and mod- 

 erately convex. Surface marked by about 40 strong radii which are 

 subangular in the umbonal region but which become broadly rounded or 

 flattened in the posterior and marginal portions of the shell. In the 

 extreme posterior marginal region they are obsolescent. The radii are 

 separated by broad flat interspaces and crossed by very fine concentric 

 striae. 



The collection contains a single right valve which appears to be identical 

 with the shell figured and described by Hall. 



Occurrence. — Eomney Formation, Onondaga Member. One mile 

 east of Oldtown. 



Collection. — U. S. National Museum. 



[E. M. Kindle.] 



