Maryland Geological Survey 465 



feeble fold not far from the anterior extremity; aperture emarginate in 

 front. Umbilicus narrow, oblique, the last of the body spirals constituting 

 an obtuse umbilical keel. The genus has been shifted back and forth 

 between the Purpuridce and the Cancellariidce, but Conrad was probably 

 correct in referring it to the former. It differs from Purpura chiefly in 

 the rather wide umbilicus and in the strength of the columellar plait. The 

 differences between Morea and Cancellaria are much more significant. 

 The contour both of the shell and of the aperture differ from that of 

 Trigonostoma, the subgenus that includes all the umbilicate Cancellariw. 

 The general character of the sculpture is purpuroid rather than cancellate. 

 Those Cancellariw in which the number of columellar folds is reduced 

 below the normal retain those upon the medial portion of the whorls 

 longest. In Morea it is the anterior plait which persists while no trace of 

 medial plications can be detected. 



The genus is restricted in its known distribution to the Upper Cre- 

 taceous of the East Coast and Gulf. 



A. Maximum diameter approximately two-thirds of the altitude; axial 



sculpture more or less irregular and incremental in character. 



Morea naticella 



B. Maximum diameter less than two-thirds the total altitude; axial sculp- 



ture of well-defined fillets, uniform in size and arrangement. 



Morea marylandica 



Morea naticella Gabb 

 Plate XVIII, Fig. 12 



Purpura (Morea) naticella Gabh, 1860, Jour. Acad. Nat. Sci., Phila., 2d ser., 



vol. iv, p. 301, pi. xlviii, fig. 14. 

 Morea naticella Meek, 1864, Check List Inv. Fossils, N. A., Cret. and Jur., 



p. 19. 

 Morea naticella Conrad, 1868, Cook's Geol of New Jersey, p. 729. , 

 Pyropsis naticoides Whitfield, 1892, Mon. U. S. Geol. Survey, vol. xviii, p. 



43, pi. ii, figs. 5-7. 

 Morea naticella Whitfield, 1892, Ibidem, p. 97, pi. xii, figs. 19, 20. 

 Pyropsis naticoides Johnson, 1905, Proc. Acad. Nat. Sci., Phila., p. 24. 

 Morea naticella Johnson, 1905, Ibidem, p. 26. 

 Morea naticella Weller, 1907, Geol. Survey of New Jersey, Pal., vol. iv, p. 



800, pi. xcviii, figs. 14, 15. 



Description. — "Shell patulous; whorls four; mouth wide; surface 

 marked by longitudinal ribs, crossed by lighter revolving lines. A cast. 



