Maryland Geological Strvey 273 



concentric ribs; also by strong radii diverging from the beal^, usually 

 niarkiiiii- tliat portion of the shell between the cincture and the umbonal 

 ridge, sometimes covering the entire surface." Hall, 1885. 



A perfectly marked specimen of this species was found on the road from 

 Hancock to Harrisonville, Pa., two miles north of Hancock, Washington 

 County, on which the surface markings, so characteristic of this species, 

 are well preserved. It was also reported by Hall from the Hamil- 

 ton group near Cumberland, Md. (Pal. N". Y., vol. v, pt. i, Lamel- 

 libranchiata ii, p. 470) one specimen of which was figured (pi. xcvi, fig. 

 1). This species is readily identified by its small size; cuneate outline; 

 prominent cincture extending from the beak to the base; concentric striae 

 and ril)s anterior to the cincture; prominent radii geiu'i'ally from tlic 

 cincture to tlie umhonal ridge; and obliquely to vertically truncate pos- 

 terior end. 



Length, about 20 mm., posterior end broken; height, 12 mm. 



Occurrence. — Eomney Formatiox, Hamilton Member. On Han- 

 cock-Harrisonville Road alxnit 2 miles north of Hancock. 



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

 American ]\Iuseum of ISTatural History. 



Order TELEODESMACEA 



Superfamily CYPRICARDIACEA 

 Family PLEUROPHORIDAE 



Genus CYPRICARDELLA Hall 



Cypeicardella belltstrtata (Conrad) 



Plate XX XIV. Figs. 1-i 



Microdon bellastriata Conrad, 1842, Jour. Acad. Nat. Sci., Phila., vol. viii, p. 



247, pi. xiii, fig. 12. 

 Microdon hellofitriata Hall, 1S43, Geol. N. Y., pt. iv. p. 196, fig. 2. 

 Microdon bellastriata Rogers, 185S, Geol. Penna., vol. il. p. 827, fig. 660. 

 Microdon (Cypricarclella) helUstriatus Hall, 1885, Pal. N. Y., vol. v, pt. i, 



Lamellibranchiata ii, p. "OS, pi. xlii, figs. 17-20; pi. Ixxiii, figs. 7-22; 



pi. Ixxiv, figs. 5-10. 

 18 



