MARYLAXD GEOLOGICAL SURVEY 291 



the fragments found at Eeed's belong to a new species. It is best not 

 to attempt to name or describe a new species from the broken material 

 at hand, but the presence of a species in the Miocene at this locality 

 should be noted in the hope that some later investigator may be for- 

 tunate enough to secure material suitable for specific characterization. 



Occurrence. — Calvert Formation. Eeed's. 



Collection. — Maryland Geological Survey. 



Superfamily SOLENACEA. 

 Family SOLENID/E. 



Genus ENSIS Schumacher. 



Ensis directus (Conrad). 



Plate LXXI, Figs. 2, 3. 



Solen ensin Conrad, 1842, Proc. Nat. Inst., Bull, ii, p. 191 ; not of Linne. 



Solen directus Conrad, 1843, Proc. Acad. Nat. Sci. Phila., vol. i, p. 32.5. 



Solen magnodtntaius. H. C. Lea, 184.5, Trans. Amer. Philos. See, vol. ix, p. 236, pi. 



xxxiv, fig. 8. 

 Solen ensis Tuoraey and Holmes, 1S56, Pleiocene Fossils of South Carolina, p. 101, 



pi. xxiv, fig. 3. 

 Solen americanus Gould (Binney's), 1870, Invert. Mass., p. 42. 

 Ensatella americana Verrill, 1872, Amer. Jour. Sci., ser. iii, vol. iii, pp. 212, 284. 

 Ensatella americana Verrill, 1874, Kept. Invert. An. Vin. Sound, p. 674, pi. xxxii, 



fig. 24.5. 

 Ensis americana Dall, 1889, Bull, xxxvii, U. S. Nat. Mus., p. 73, pi. liii, flg. 4; 



pi. Iv, figs. 4, 5. 

 Ensis directus Dall, 1900, Trans. Wagner Free Inst. Sci., vol. iii, pt. v, p. 954. 



Description. — " Linear, straight, except towards the summit, where it 

 is slightly recurved, gradually widening from the hinge downwards ; basal 

 margin rounded slightly towards the posterior extremity; anterior mar- 

 gin obliquely truncated, not reflected; cardinal teeth, one in the right 

 valve, compressed, in the opposite valve two, the superior one very small 

 and near the extremity, the other somewhat distant, elevated, robust, 

 slightly recurved. Length, four inches."' Conrad, 1843. 



It is distinguished from E. ensiformis by being larger and by its 

 more squarely truncated posterior end. It is almost impossible to secure 

 more than broken pieces in the Maryland deposits. 



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



Collection. — Maryland Geological Survey. 



