252 SYSTEMATIC PALEONTOLOGY 



Family NATICID/E. 



Genus POLYNICES Montfort. 

 Subgenus NEVERITA Risso. 



PoLY'NiCEs (Neveeita) duplicatus (Say). 

 Plate LX, Fig. 1. 



Nation duplicata Say, 1823, Jour. Acad. Nat. Sci. Phila., vol. ii, 1st sen, p. 247. 

 Natica duplicata Conrad, 1830, Jour. Acad. Nat. Sci. Phila., vol. vi, 1st ser., p. 211. 

 Natica duplicata Conrad, 1842, Proc. Nat. Inst., Bull, ii, pp. 185, 186. 

 Natica {Neverita) duplicata ? Conrad, 1863, Proc. Acad. Nat. Sci. Phila., vol. xiv, 



p. 564. 

 Neverita duplicata Meek, 1864, Miocene Check List, Smith. Misc. Coll. (183), p. 19. 

 Polyuices {Neverita) duplicatus Dall, 1892, Trans. Wagner Free Inst. Sci., vol. iii, pt. 



ii, p. 368. 

 Natica duplicata Harris, 1893, Amer. Jour. Sci., ser. iii, vol. xlv, pp. 25, 26, 28. 

 Neverita duplicata Whitfield, 1894, Mon. xxiv, U. S. Geol. Survey, p. 121, pi. xxi, 



figs 13-16. 



Description. — ''' Shell thick, sub-globose, cinereous, with a black line re- 

 volving on the spire above the suture, and becoming gradually diluted, 

 dilated, and obsolete in its course; within brownish-livid; a large incras- 

 sated callus of the same color extends beyond the columella, and nearly 

 covers the umbilicus from above; umbilicus with a profound sulcus or 

 duplication." Say, 1823. 



Height, 45 mm. ; diameter, 52 mm. 



Occurrence. — St. Mary's Formation. St. Mary's Kiver, Cove Point, 

 Langley's Bluff. Choptank Formation. Dover Bridge, Greensboro, 

 Peach Blossom Creek, Jones Wharf, Governor Eun, 2 miles south of Gov- 

 ernor Kun. Calvert Formation. Plum Point, Church Hill. 



Collections.— Mavylsindi Geological Survey, Johns Hopkins University, 

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

 Wagner Free Institute of Science, Cornell University. 



Subgenus LUNATIA Gray. 



Polynices (Lunatia) hemicryptus (Gabb). 

 Plate LX, Fig. 2. 



Natica hemicrypta Gabb, 1860, Jour. Acad. Nat. Sci. Phila., vol. iv, 2nd ser., 



p. 375, pi. Ixvii, fig. 5. 

 Polynices {Lunatia) hemicryptus Dall, 1892, Trans. Wagner Free Inst. Sci., vol. iii, 



pt. ii, p. 371. 

 Natica {Lunatia) hemicrypta Whitfield, 1894, Mon. xxiv, p. 118, pi. xxii, figs. 1-5. 

 Not Natica hemicrypta Conrad. 



