1919.] NATURAL SCIENCES OF PHILADELPHIA. 25 



Distribution. — Yorktown Formation. 5 miles northeast of Smith- 

 field, James River, Isle of Wight County, Virginia. Duplin For- 

 mation. Natural Well, 1^ miles north of JVIagnolia, Duplin County, 

 North Carolina. Muldrow's Place, 5 miles southeast of Mayes- 

 ville, Sumter County, South Carolina. 



Collections. — U. S. National Museum. Johns Hopkins Uni- 

 versity. Academy of Natural Sciences of Philadelphia. 



Mitra dalU new species. Plate I, figs. 4, 8, 



Mitra sp. indet., Dall, 1890, Trans. Wagner Free Inst. Sci., Philadelphia, 

 vol. iii, pt. ii, p. 93. 



Original Description. — "A single specimen too worn to name 

 was found in the Caloosahatchie marl. It has about sixteen ribs 

 and in general resembles a slender M. Wandoensis, but just below 

 the periphery of the whorl is a marked groove, channelled and 

 cutting the ribs as well as the interspaces. On the earlier whorls 

 this channel revolves a short distance behind the suture, which 

 thus appears double. This character will enable the species to 

 be recognized when perfect specimens are found. There are 

 three folds on the columella and the shell is about the size of the 

 next species. {Mitra wilcoxU.) " Dall,. 1890. 



General Characters. — Shell small, slender, terminating obtusely. 

 Aperture about one-third the total altitude. Whorls of conch 

 6| in number, fiat-sided, tabulated behind, wound about one 

 another like a bandage with the posterior edge folded under. Body 

 rather abruptly constricted at the base. Sutures deeply im- 

 pressed. 



Protoconch. — Nucleus smooth, papillate, coiled 1| times. 



Sculpture. — Axial sculpture of about 18 sharp, narrow, elevated, 

 slightly arcuate costse which persist with undiminished strength 

 from suture to suture and, on the ultima, as far as the canal. Spiral 

 lirations, for the most part, discernible only under magnification; 

 the spiral sculpture, of the apical whorls, with the exception of 

 the pre-sutural groove, confined to the intercostal areas; lirations 

 low, broad, and flattened, 5 to 8 to the whorl as a rule, separated 

 by narrower interspaces; number and character of the lirations 

 on the portion of the body whorl posterior to the impressed groove 

 similar to that of the earlier whorls; spirals much more prominent 

 anterior to the groove and visible without magnification, 4 to 6 

 in number, exclusive of those upon the canal, unequal in size and 

 strength, and for the most part, separated by linear interspaces; 



