MARYLAND GEOLOGICAL SURVEY 189 



There is great variation in the strength and spacing of the spiral 

 sculpture and at times the spiral striae almost disappear. This species 

 has a wide range both geologically and geographically. It appears in 

 the Miocene of Maryland and North Carolina, is common in the Pliocene 

 •of the Carolinas and Florida, and in the Pleistocene occurs at various 

 points from Massachusetts to the Gulf coast of Florida. In the Eecent 

 it ranges from Nova Scotia to Florida and the Antilles, as far south as 

 Barbadoes, and along the shore of the Gulf of Mexico to Texas. 



Lenth, 7 mm.; width, 1.5 mm. 



Occurrence. — -Talbot Formation. Wailes Bluff near Cornfield Har- 

 bor, St. Mary's County. 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

 and U. S. National Museum. 



Family CALYPTRAEIDAE. 



Genus CREPIDULA Lamarck. 



Crepldula eornicata (Linne) 



Plate LI, Figs. 1-4. 



Patella fomicata Linne, 1758, Syst. Nat., p. 1257. 



Patella fomicata Gmelin, 1792, Syst. Nat., p. 3693. 



Crepidula fomicata Lamarck, 1822, Hist. Nat. S. Vert., vol. vi, (II) p. 24. 



Crypta fomicata Holmes, 1859, Post-PL Fos. S. C, p. 95, pl.'xiv, fig". 11. 



Crepidula fomicata Dall, 1889, Bull. TJ. S. Nat. Mus., No. 37, p. 152, pi. xlviii, 



fig. 16; pi. 50, figs. 23, 24. 

 Crepidula fomicata Dall, 1892, Trans. Wagner Free Inst. Sci., vol. iii, pt. 2, 



p. 356. 

 Crepidula fomicata Martin, 1904, Md. Geo!. Survey, Miocene, pp. 249, 250, 



pi. lix, figs. 4a, 4b. 



Description. — "P. [Cr.] testa ovali, posterius oblique recurva; labio 

 posteriori concavo." Gmelin, 1792, and Lamarck, 1822. 



This common form has afforded no very large specimens in the Mary- 

 land Pleistocene. Some are considerably inflated and suggest C. convexa, 

 but they all belong to C. fomicata. 



This species appears first in 'the Florida Oligocene. It is found in the 

 Miocene from New Jersey to Florida, in the Pliocene of the Carolinas, 



