MARYLAND GEOLOGICAL SURVEY 183 



This little species is quite variable in some specimens, the whorls being 

 much more ventricose than in others. By earlier writers it was often con- 

 founded with C. communis Conrad, a much larger form, found in the 

 Miocene. 



C. lunata makes its appearance in the Pliocene of the Carolinas. In 

 the Pleistocene it ranges from Massachusetts to Florida and has the same 

 limits in the Eecent. 



Length, 5mm.; width, 2.5 mm. 



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

 bor, St. Mary's County; Federalsburg, Caroline County. 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

 and U. S. National Museum. 



Family MUR1CIDAE. 



Genus EUPLEURA Adams. 

 EUPLEURA CAUDATA (Say) 



Plate XLIX, Figs. 7, 8. 



Ranella caudata Say, 1822, Jour. Acad. Nat. Sci. Phila., vol. ii, 1st ser., p. 



236. 

 Eupleura caudata Holmes, 1859, Post-Pi. Fos. S. C, p. 62, pi. x, fig. 3. 

 Eupleura caudata Dall, 1889, Bull. U. S. Nat. Mus., No. 37, p. 120, pi. 1, fig. 11. 

 Eupleura caudata Dall, 1890, Trans. Wagner Free Inst. Sci., vol. iii, pt. 1, 



p. 144. 



Description. — " Shell pale reddish-brown, cancellate with eleven robust 

 costa to the body whirl, and several revolving filiform lines passing over 

 them, which are more prominent upon the varice of the aperture, termi- 

 nate at its inner edge, and there alternate with the raised lines of the 

 fauces; volutions flattened at their summits, abruptly declining to the 

 suture; canal coarctate, rather longer than the spire; beak rectilinear, re- 

 flected at the tip." Say, 1822. 



Much confusion has prevailed regarding this species. Its earliest ap- 

 pearance so far as known is in the Pliocene of the Carolinas and Florida. 



