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767 



TERTIARY FAUNA OF FLORIDA 



submargins narrow, concentrically striated, the anterior longer, with a moder- 

 ate gape, the posterior shorter, hardly differentiated from the disk ; ears small, 

 hinge-line short, shell very thin. Alt. 31, lat. 23, cliam. 10 mm. 



The perfectly smooth surface of this species differentiates it from any 

 other of our Tertiary species. 



Lima (Mantellum) carolinensis n. s. 

 PLATE 35, FICUKK 21. 



Oligocene of the Oak Grove sands, Santa Rosa County, Florida, Burns; 

 Miocene of Darlington, South Carolina, and the Duplin Natural Well, Duplin 

 County, North Carolina, Burns. 



Shell small, thin, inflated, oblique, with a moderate gape, sculptured with 

 concentric lines of growth and rather sharp, fine, numerous, somewhat irreg- 

 ular radial threads, obsolete on the beaks, absent from the posterior submargin 

 and the anterior ears ; submargins not impressed, beak prominent, ears small, 

 the margin of the gape forming a concave sinuosity in front of and below the 

 anterior beak ; hinge-line short, with a very wide pit, its lower margin project- 

 ing from the cardinal plate ; interior radially striate, the basal margin slightly 

 crenulate. Alt. 16, lat. 12, diam. 7 mm. 



This differs from L. papyria Conrad, from the Maryland Miocene, in the 

 absence of the angle which in the latter species modifies the margin just 

 below the anterior car, and in the presence of dense radial striation on the 

 anterior submargin, while in L. papyria this region is smooth. 



Lima lima Linnc. 



Os/irn lima L., Syst. Nat., Ed. x., p. 699, 1758. 



I'l-t-ti'ii raiiulii Chemnit/, Conch. Cab., vii., p. 349, pi. 68, fi^ r . 651, 1784. 

 I.iiihi sijitiiiiitiMi Lam., Syst. An. s. Vert., p. 136, 1801 ; An. s. Vert., vi., p. 156, 1819; 

 Uall, Hull. U. S. Nat. Mus., No. 37, p. 36, No. 46, 1889. 



Pliocene of the Caloosahatchie marls, Florida, Ball ; Pleistocene of the 

 West Indies ; recent on the American coast from Sarasota Bay, Florida, to 

 Bra/.il, and widely distributed in foreign seas. Type of the genus. 



This shell seems rare in the Pliocene. Only a few small specimens were 



obtained. 



Lima (Mantellum) caloosana n. s. 



1'l.ATK 28, FuaiKi; _$. 



Pliocene of the Caloosahatchie; Dall and Willcox. 



Shell inflated, oblique, strong, with a large anterior gape, the postriini 



