MARYLAKD GEOLOGICAL SURVEY 393 



Area virrjinice Dall, 1898, Trans. Wagner Free Inst. Sci., voL v, pt. ii, p. 9, pi. i, 



fig. 3. 

 -Barbatia {Granoarca) virginice Dall, 1898, Trans. Wagner Free Inst. Sci., vol. iii, 



p. 637, pi. xxxii, fig. 33. 



Description. — "Area virginice is a large, solid, elongated shell, equivalve 

 but very inequilateral, the beaks being situated near the anterior fifth of 

 the length, low and prosogyrate, distant and separated by a wide cardinal 

 area with numerous (nine) slightly angular longitudinal concentric 

 grooves; sculpture of about twenty-five strong radial ribs, smaller on the 

 posterior dorsal area, somewhat flattened, and on the posterior part with 

 a shallow, wide mesial furrow, hinge line W as long as the shell ; teeth 

 vertical, in two series, beginning mesially very small, distally larger, and 

 with a tendency to break up nr l)ec-ome irregular; muscular impressions 

 deep; margin fluted in harmony with the ends of the ribs. ..." Dall, 

 op. cit., vol. iii, p. 628. 



Two imperfect and much worn shells from the St. Mary's River, -±8 

 and 34 mm. in length, respectively, i)rnl)ably belong to this species. 



Length, 83 mm. ; height, 52 mm. ; diameter, 42 mm. 



Occurrence. — St. Mary's Formation. St. Mary's Eiver. 



Collections.— Maryland Geological Survey, Wagner Free Institute of 

 Science. 



Subf^imily PECTUNCULIN/E. 



Genus GLYCYMERIS Da Cost.i. 



Glygymeris parilis (Conrad). 



Plate CVII, Figs. 1, 2. 



Pectuncuhiti lentifornns Conrad, 1843, Proc. Nat. Inst., Bull, ii, pp. 181, 183 (listed 



only). 

 Not PectuncuJus lentiformh Conrad, 1837, Fossil Shells of the Tertiary, 3nd. Edit., 



p. 36. 

 Pectunculus parilis Conrad, 1843, Proc. Acad. Nat. Sci. Phila., vol. i, p. 306. 

 Peclnnculus parilis Conrad, 1845, Fossils of the Medial Tertiary, p. 64, pi. xxxvi, 



fig. 3. 

 Pectunculus parilis Conrad, 1863, Proc. Acad. Nat. Sci. Phila., vol. xiv, p. .580. 

 Pectunculus parilis Meek, 1864, Miocene Check List, Smith. Misc. Coll. (183), p. 5. 

 Glycymeris parilis Dall, 1898, Trans. Wagner Free Inst. Sci., vol. iii, pt. iv, p. 609. 



Description. — "Orbicular, slightly oblique; height and length equal; 

 posterior superior margin obliquely subtruncated ; ribs defined by slightly 



