Maryland Geological Survey 653 



like strige, which are abruptly recurved on the uinbonal ridge; anterior 

 muscular impression deep and strong. Tiie pallial line extends parallel to 

 the basal margin, and abruptly recurves over the umbonal ridge, terminat- 

 ing in a large shallow posterior scar upon the cardinal slope. The hinge is 

 furnished with a strong triangular fold beneath the beak of the left valve, 

 and a corresponding depression in the riglit valve. Three specimens 

 measure respectively 90, 91, and 49 mm. in length, and 49, 39, and 28 

 mm. in height. This species closely resembles G. Jiamiltonensis, but 

 differs principally in its proportionally shorter form, more convex basal 

 margin and more direct umbonal ridge." Hall, 1885. 



The individual observed agrees with Hall's figures of New York speci- 

 mens save that the posterior extremity is a little more obliquely truncated. 



Occurrence. — Jennixgs FoR^iiATiox, Parkiiead Me^iber. Four 

 miles southeast of Pratt, on White Sulphur Branch, rare. 



Collection. — Maryland Geological Survey. 



Order TELEODESMACEA 



Superfamily CYPRICARDIACEA 

 Family PLEUROPHORIDAE 



Genus CYPRICARDELLA Hall 



Cypricaedella bellistriata (Conrad) ' 

 Plate LXV, Figs. 8-10 



This species differs from C. gregaria in possessing much stronger con- 

 centric striae which are distinct even in casts of the interior. It differs 

 from C. marylandica in being larger, less convex in its proportions as 

 well as in occurring at a lower horizon. Rather common in the Parkhead 

 fauna. 



Occurrence. — Jennings Formation, Parkhead Member. One and 

 one half miles south of Pound, West A'irginia ; 2 miles north of mouth of 

 Town Creek, 1642, 1716. 



Collection. — Maryland Geological Survey. 



* For synonymy and description see page 273. 



