TRANSACTIONS OF WAGNER 

 954 



TERTIARY FAUNA OF FLORIDA 



a species reported by Conrad from Ocoya Creek (H. Ex. Doc. 129, p. 8, 

 1855). Hypogella cuneata Gabb (Pal. Cal., ii., p. 175, pi. 29, fig. 61, 1868) 

 from the Eocene of Martinez, California, may prove to be a Modiolus or 

 allied form; and his figure of H. parallela {op. cit., ii., p. 233, 1869) looks 

 more like a Solecurtus. It may be Cretaceous and not Eocene, as he sup- 

 posed. A fragment figured by Harris (Bull. Pal., ii., p. 258, pi. 13, fig. 9, 

 1897) may belong to 5". Hsbonensis Aldrich. Solen obliquus Sowerby, 1844, 

 of the Parisian Eocene, is a typical Plectosolen, but appears to be distinct from 

 the Solen (Soleiia) obliquus Spengler, 1794, and should receive a new name. 



Genus ENSIS Schumacher. 

 Solen (sp.) Linne, Syst. Nat., ed. x., p. 672, 1758. 

 Ensis Schumacher, Essai, p. 143, 1817. Type E. magnus Schum., pi. xiv., fig. 4 (Chemn. 



Conch. Cab., vi., p. 44, pi. 4, fig. 29, 1782). 

 Ensatella Swainson, Treatise Mai., p. 365, 1840. Type Solen ensis L. ; Verrill, Inv. An. 



Vineyard Sound, p. 674, 1873. 

 Ensis Gray, P. Z. S., 1847, p. i8g; List Brit. An., vii., p. 58, 185 1 ; Ann. Mag. N. Hist., 



xiv., p. 24, 1854; Conrad, Cat. Solenidw, Am. Journ. Conch., iii., p. 26 (Suppl.), 



1867; Fischer, Man. Conch., p. mo, 1887. 

 Solen Leach, Synops. Brit. Moll., p. 260, i8S2. 



This genus is well defined by its hinge, perfectly distinct from that of 

 Solen. The name is masculine. Each north and south coast appears to have 

 a large northern form (E. magnus, Europe, E. directns, eastern America) 

 and a smaller similar southern form (£. ensis, Europe, and E. minor, southern 

 American coast). E. magnus Schum. differs from our American form by 

 being straighter and more slender; on the Pacific coast the large northern 

 form is wanting and the small southern one represented by E. californicus 

 Dall. A somewhat similar parallelism is found in the species of Siliqua. 



Ensis directus Conrad. 

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

 Solen directus Conrad, Proc. Acad. Nat. Sci. Phila., i., p. 325, 1843. 

 Solen magnodentatus H. C. Lea, Trans. Am. Phil. See, 2d Sen, ix., p. 236, pi. 34, fig. 8, 



184s. 

 ? Ensis " americana Beck," H. and A. Adams, Gen. Rec. Moll., ii., p. 342, 1856. 

 Solen ensis Tuomey and Holmes, Pleioc. Fos. S. Car., p. loi, pi. 24, fig. 3, 1856; not 



of Linne. 

 Solen americanus Gould, Inv. Mass., 2d ed., p. 42, 1870. 



