Class PELECYPODA. 



Order TELEODESMACEA. 



Superfamily ADESMACEA. 



Family PHOLADID/E. 



Subf:imily PHOLADIN/E. 



Genus PHOLAS (Linne) Lamarck. 



Subgenus THOVANA Gray. 



Pholas (Thovana) producta Conrad. 



Plate LXV, Pig. 1. 



Pholas oblongata Tuomej' aud Holmes, 1856, Pleiocene Fossils of South Carolina, 



p. 103, pi. xxiv, fig. 5. 

 Not Pholas oblongata Say. 



Pholas producta Conrad, 1803, Proc. Acad. Nat. Sci. Phila., vol. xiv, p. 571. 

 Pholas producta Meek, 1864, Miocene Check List, Smith. Misc. Coll. (183), p. 12. 

 Pholas (Thovana) producta Dall, 1898, Trans. Wagner Free Inst. Sci., vol. iii, pt. 



iv, p. 815. 



Description. — " Shell oblong-ovate, inflated, transversely and longi- 

 tudinally striated; strige miiricated, and elevated on the buccal side into 

 ribs; buccal margin acutely rounded; anal margin compressed; dorsal 

 margin anteriorly reflexed, forming a cavity; hinge callous, minutely 

 striated transversely and longitudinally, and with about twelve cells." 

 Tuomey and Holmes, 1856. 



Occurrence. — Choptank Formation. Greensboro. 

 Collection. — Maryland Geological Survey. 



Genus BARNEA (Leach MS.) Risso. 



Subgenus SCOBINA Bayle. 



Barnea (Scobina) arcuata (Conrad). 



Plate LXV, Figs. 2, 3. 



Pholas arcuata Conrad, 1841, Fossils of the Medial Tertiary, p. 3 of cover of No. 3. 

 Pholas acuminata Conrad, 1845, Fossils of the Medial Tertiary, p. 77, pi. xliv, fig. 2. 



