584 PROCEEDINGS OF THE ACADEMY OF 



situated much above the middle, not tuberculated ; summits channelled and 

 margined with a carina, which is most conspicuous on the body whorl, and 

 beneath it is a flattened space. Length 3J inches, width 1J. 



Locality. St. Mary's River, Md. 



A single specimen only was found, which appears to be a mature shell, and 

 is most nearly allied to B. canaliculatum. The spire is more elevated than in 

 that species, and differs also in being without tubercles. 



B. Carolinense, C. 



B. canaliculatum, Tuomey and Holmes (not Lam.), Pliocene Foss. S. C. 145. 

 29. 3. 



B. adversarium, C. 



B. perversum, Tuomey and Holmes (not Lam.), Pliocene Foss. S. C. 14(j, 

 29, 2. 



B. scalarispira. Subfusiform ; spire moderate, turrited, sides above the 

 angle oblique ; angle subcarinated, with numerous approximate subcompressed 

 tubercles ; whorls striated transversely. 



Locality. Shiloh, Cumberland, Co., N. J. 



Allied to B. rugosum, but differs in wanting the channel round the base of 

 the whorls. 



B. striatum. Subfusiform ; spire moderate in elevation, sides of whorls 

 oblique, the angles near the suture furnished with not very prominent obtuse 

 tubercles ; beak long and straight; whorls conspicuously striated. 



Locality. Like the preceding, this species is without a channel, and is small, 

 probably a young shell. 



TURRITELLA, Lam. 



T. xquistriata. Subulate, volutions 14, bicarinate, carinas distant with a con- 

 cave interval, the lower carina near the suture ; surface covered with nearly 

 equal fine closely-arranged striae, with a minute intermediate line ; aperture 

 longer than wide. 



Locality. Shiloh, Cumberland Co., N. J. 



T. Cumberlandia. Elongated, tapering gradually ; volutions 24, bicarinated, 

 carinae nearly equal, distant; revolving lines unequal, wrinkled; sides of 

 whorls concave between the carina?, somewhat channelled beneath the lower 

 one, and rounded at base. Length 2f. 



Locality. Shiloh, Cumberland Co., N. J. 



A URICULID.E. 



MELAMPUS, Mont. 



Subgenus Ensiphorus, Conrad. 



M. longidens. Acutely oval; spire conical, mucronate at the top ; whorls 7 : 

 suture profound ; aperture very narrow ; labrum dentato-striate within ; base of 

 columella with an elongated, slightly curved plate, directed obliquely upwards 

 in the line of the aperture. 



Locality. Yorktown, Va. 



The single elongated plate at base distinguishes this subgenus. 



DACTYLUS, Klein. 



D. Carolinensis. Cylindrical ; spire short, conical ; whorls concave or angu- 

 lated ; columella strongly plaited throughout; substance of shell very thick 

 at base. 



Locality. Dauphin Co., N. C. Prof. Mitchell. 



[Dec. 



