336 SYSTEMATIC PALEOXTOLOGT 



Shell nearly hemispherical, length slightly greater than height; car- 

 dinal teeth small, projecting, in right valve three, in left valve two, 

 ligament area narrow; muscular impressions sometimes indistinct; exter- 

 nal surface nearly smooth. Rare and very difficult to obtain entire. 



Length, 34 mm.; height, 32 mm.; diameter, 14 mm. 



Occurrence. — Choptank Formation. Governor Run, Flag Pond, 

 Jones Wharf. Calvert Formation. Plum Point. 



Collections. — Maryland Geological Survey, Johns Hopkins University. 



Family LUCINID/E. 



Genus PHACOIDES Blainville. 



Subgenus PSEUDOMILTHA Fischer. 



Phacoides (Pseudomiltha) foremaki (Conrad). 



Plate XC, Figs. 1, 2. 



Lncina Forernani Conrad, 1841, Proc. Acad. Nat. Sci. Phila., vol. i, p. 29. 

 Lucina Forernani Conrad, 1842, Jour. Acad. Nat. Sci. Phila., vol. viii, 1st ser.,p. 184. 

 Lucina Forernani Conrad, 184.5, Fossils of the Medial Tertiary, p. 71, pi. xl, tig. 4. 

 Luci7ia Forernani Conrad, 18R3, Proc. Acad. Nat. Sci. Phila., vol. xiv, p. 577. 

 Lttcina forernani Meek, 1864, Miocene Check List, Smith. Misc. Coll. (183), p. 8. 

 Phacoides (Pseudomiltha) Forernani Dall, 1903, Trans. Wagner Free Inst. Sci., vol. 

 iii, pt. vi, p. 1378. 



Description. — " Orbicular, ventricose, moderately thick; surface with 

 irregular shallow grooves, and rather distant prominent striae, with 

 intermediate, fine, concentric lines; posterior margin subtruncated obli- 

 quely outwards; beaks prominent, not central; hinge edentulous. 

 Length, 1| inch." Conrad, 1841. 



It may be distinguished from F. anoclonta by being smaller and much 

 more convex; as found in Maryland, the interior, prismatic portion of 

 the shell is often badly decayed, while the exterior portion is usually 

 well preserved; it is at times -quite thick. 



Length, 35.5 mm.; height, 34 mm.; diameter, 8.5 mm. 



Occurrence. — Choptank Formation. Governor Run. Calvert For- 

 mation. Plum Point. 



Collections. — Maryland Geological Survey, Johns Hopkins University. 



