MARYLAND GEOLOGICAL SURVEY 253 



Description. — "Globose; Avhorls four, rounded; siDire elevated, suture 

 faint; mouth rounded; callosity small, partly covers the umbilicus, which 

 is deep, surface smooth/' Gabb, 1860. 



Height, 15 mm.; diameter, 11 mm. 



Occurrence.- — Ckoptank Formation. Jones Wliarf. Calvert For- 

 mation. Plum Point, Church Hill, 3 miles south of Chesapeake Beach. 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

 U. S. National Museum. 



PoLYNiCES (Lunatia) heros (Say). 

 Plate LX, Figs. 3, 4. 



Natica heros Say, 1822, Jour. Acad. Nat. Sci. Pliila., voL ii, 1st ser., p. 248. 

 Natica interna Saj', 1824, Jour. Acad. Nat. Sci. Pbila., voL iv, 1st ser., p. 125, pi. 



vii, tig. 2. (Reprint, Bull. Amer. Pal., No. 5.) 

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

 Natica heros Conrad, 1842, Proc. Nat. Inst., Bull, ii, p. 185. 

 Natica {Lunatia) catenoides Conrad, 1863, Proc. Acad. Nat. Sci. Pbila., vol. xiv, 



p. 56.5. (Not of Wood.) 

 Natica (Lunatia) interna Conrad, 1863, Proc. Acad. Nat. Sci. Phila., vol. xiv, p. 565. 

 Lunatia catenoides Meek, 1864, Miocene Check List, Smith. Misc. Coll. (183), p. 19. 



(Not of Wood.) 

 Lunatia interna Meek, 1864, Miocene Check List, Smith. Misc. Coll. (183), p. 19. 

 Lunatia catenoides '? Conrad, 1868, Amer. Jour. Conch., vol. iii, p. 258, pi. xxiii, 



flg. 5. 

 Polynices {Lunatia) internus Dall, 1892, Trans. Wagner Free Inst. Sci., vol. iii, pt. ii, 



p. 372, pi. XX, flg. 7. 

 Polynices {Lunatia) perspectivus Dall, 1892, Trans. Wagner Free lust. Sci., vol. iii, 



pt. ii, p. 373. 

 Polynices (Lunatia) heros Dal], 1892, Trans. Wagner Free Inst. Sci., vol. iii, pt. ii, 



p. 373. 

 Natica heros Harris, 1893, Amer. Jour. Sci., ser. iii, vol. xiv, pp. 25, 27, 28. 

 Natica (Lunatia) heros Whittield, 1894, Mon. xxiv, U. S. Geol. Survej-, p. 119, pi. 



xxii, figs. 9, 10. 



Description. — ''Shell suboval, thick, rufo-cinereous ; within whitish; 

 columella incrassated; callous not continued over the upper part of the 

 umbilicus, hardly extending beyond a line drawn from the base of the 

 columella to the superior angle of the labrum; umbilicus free, simple." 

 Say, 1822. 



Dr. Dall says in regard to this species as restricted by him : " This 

 species is somewhat variable, and the difference between the sexes is very 

 marked. In a pair from ISTova Scotia having each a height of 50 mm. 



