GASTEROPODA OP THE LOWER GREEN MARLS. 97 



Genus MOREA Conrad. 



MOREA NATICELLA. 



Plate XII, Figs. 19, 20. 



Purpurea {Morea) naticella (jtshh : Jour. Acad. Nat. Sci., Phila., 2d ser., vol. 4, 



p. 301, PI. XLVIII, Fig. 15 (14 on plate). 

 Morea naticella Gabb: Synopsis, p. 59; Meek, Check List Cret. and Jur. Foss., p. 



19; Geol. N J., Newark, 1868, p. 729. 

 ? Morea naticella Gabb: Stoliczka, Ind. Geol. Surv., Pal. Indica, Cret. Fauna 



South. Ind., vol. 2. 

 Morea cancellaria Conrad: Jour. Acad. Nat. Sci., Phila., 2d ser., vol. 4, p. 290, 



PI. XL VI, Fig. 30. 



Shell of about a medium size, subglobular, or broadly oblate in out- 

 line, with ventricose volutions which are most inflated on the upper third, 

 and number about three and a half; spire moderately high for the genus ; 

 aperture broadly elliptical, pointed above and obtusely so at the base; col- 

 umella with a single spiral ridge near the lower part, as seen on the inter- 

 nal cast; surface marked, even on the cast, by strong spiral ridges and fur- 

 rows, of which ten or eleven of the former may be counted, leaving a plain 

 space at the base of the shell equal to that of two of the ridges; also by 

 somewhat more distant, transverse, broadly rounded ridges which divide 

 the surface into a series of regular low tubercles. 



I do not know of any Cretaceous shell at all resembling this one in 

 this country except Morea cancellata Conrad, from the Cretaceous deposits 

 at Eufaula, Alabama, which I strongly suspect to be the same species, but 

 the specimen figured is much smaller, and this one does not appear to have 

 been so much produced in front as is that one. This may be due, how- 

 ever, to the difference between the actual shell and the cast of the interior 

 only. 



Mr. Conrad considered this genus to belong to the Purpuridoe,^ and I 

 think very properly so, judging from his figure. It seems to differ very 

 little from the recent group Gistrum Mont, except in the presence of the 

 ridge or plication on the lower part of the columella, being somewhat more 

 distinct than in that genus. Stoliczka places it, with doubt, with the Ba- 



' Am. Jour. Conch., vol, 4, p. 249. * 



MON, xvni 7 



