1919.] NATURAL SCIENCES OF PHILADELPHIA. 35 



viduals with which it is confusable, the nucleus has more turns, 

 and furthermore, there is a microscopically fine but very distinct 

 and regular spiral sculpture developed on the earlier whorls of 

 the conch, which has never been perceptible on any of the fossil 

 individuals. It would be indeed remarkable to find in the Ter- 

 tiary sands the representatives of a recent deep water species 

 associated with limpets, littorinas, clams and other characteristic 

 denizens of the littoral zone. There is, however, no reliable evi- 

 dence that we are in the face of any such phenomenon. The 

 type is in the Collections of the United States National Museum 

 and has been listed as Astyris 'profundi var. permagna. As per- 

 magna has never been described nor figured, the label name has 

 been abandoned in order to avoid the confusion of applying so 

 suggestive an adjective to a subspecies of approximately the same 

 dimensions as the species sensu stricto. 



Distribution. — Duplin Formation. Natural Well, 1| miles north 

 of Magnolia, Duplin County; Lake Waccamaw, Columbus County, 

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

 ville, Sumter County, South Carolina. Waccamaw Formation. 

 Walker's Bluff, Bladen County. Neill's Eddy Landing, 3 miles 

 north of Cronley, Columbus County, North Carolina. Tilly's 

 Lake, Horry County, South Carohna. 



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

 versity. Academy of Natural Sciences of Philadelphia. 



Urosalplnx phriknos new species. Plate IV, figs. 2, 4, 6, 7. 



General Characters. — Shell of medium size, fusiform, the greatest 

 diameter falling very close to the median line. Aperture approxi- 

 mately half the total altitude. Component volutions normally 

 7 in number in the adult conch. Whorls of spire convex, obscurely 

 shouldered, decreasing rapidly in size toward the acute apex. 

 Body whorl rather abruptly constricted at the base. Posterior 

 fasciole closely appressed against the preceding volution. Suture 

 line slightly impressed, undulated. 



Protoconch. — Protoconch including 1^ small, smooth, somewhat 

 flattened whorls. First half turn partially submerged in the 

 succeeding volution. Differentiation between conch and proto- 

 conch very sharp. 



Sculpture. — Both axial and spiral sculpture initiated at the 

 beginning of the first whorl of the conch. Axial sculpture of 9 

 or 10 broad, rounded, prominent ribs which tend to evanesce 



