146 SYSTEMATIC PALEONTOLOGY 



as broad. A few transverse imj)ressed lines may be seen in the aperture. 

 It has some resemblance to the Marylandicus but difEers from that shell 

 in the spire not being carinated; in the whorls being concave, and in 

 the general contour of the shell.'' Green, 1830. 



Length, 67 mm. ; diameter, 33 mm. 



Occurrence. — St. Mary''s Fokmatiox. St. Mary's River, Langley's 

 Bluff. 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

 Philadelphia Academy of Natural Sciences, U. S. National Museum, 

 Cornell University. 



CoNUS MARYLANDICUS Green. 



Conus Marylandicus Green, 1830, Trans. Albany Institute, voL i, p. 134, pi. iii, 



fig. 2. 

 Conus diluvianus Tuomey and Holmes, 1856, Pleiocene Fossils of South Carolina, 



p. 133, vol. xxvii, fig. 1.5. 

 Conus dilnivianus Emmons, 1858, Kept. N. Car. Geol. Survey, p. 263, fig. 143. 

 Conus marylandicus Dall, 1895, Proc. U. S. Nat. Museum, vol. xviii [No. 1035], 



p. 42. 



Description. — " Shell conical, pyriform, with 8 or 10 deep grooves at 

 the base. In some specimens, upon a very close examination, impressed 

 transverse lines may be discovered on the upper half of the body whorl; 

 spire elevated and acute; the whorls channeled and carinated on their 

 lower edges : length an inch and a half, and half as broad." Green, 1830, 



There is nothing further to indicate that this species occurs in Mary- 

 land. 



Family PLEUROTOMID/E. 



Genus PLEUROTOMA Lamarck. 

 Subgenus HEMIPLEUROTOMA Cossmann. 



Pleurotoma (Hemipleurotoma) albida Perry. 

 Plate XLI, Fig. 1. 



Pleurotoma albida Perry, 1811, Conch., expl. pi. xxxii, fig. 4. 



Pleurotoma albida Dall, 1890, Trans. Wagner Free Inst. Sci., vol. iii, pt. i, p. 38, 

 pi. iv, fig. 8a. 



Description. — Shell elongate, eight-whorled, spire and beak attenuate, 

 spire sloping uniformly from the shoulder of the body-whorl ; each whorl 



