14 PBOCEEDIWGS OF THE NATIONAL MUSEUM vol.72 



situated 1 to 2 millimeters away from the dorsal margin. Dimensions 

 of the type, a left valve: Length, 50 mm.; height, 40+ mm. (the 

 specimen is somewhat deformed and crushed). Hinge and internal 

 features not uncovered. 



Surface marked by fine concentric growth lines and by radiating 

 sculpture which varies greatly in strength of development on different 

 individuals. On the type the surface is nearly smooth around the 

 beak; away from the beak the smooth surface passes into a surface 

 marked by fine radiating lines to a distance of 18 or 20 mm., and this 

 in turn passes into the more coarsely ribbed portion of the shell ; the 

 main ribs are faint to moderately strong, subangular to rounded, 

 and some of them show faint irregularly spaced nodes; the spaces 

 between the ribs differ markedly in width but in general are wider 

 than the ribs. 



Remarks. — The species is related to Anomia, ornata Gabb from the 

 upper part of the Ripley formation in the Chattahoochee region, 

 Georgia, but its main ribs are less strongly developed and it lacks 

 the numerous small, sharply defined subordinate ribs of the Georgia 

 species. The species is also related to Anomia forteplicata Gardner, of 

 Maryland, a form that is also closely related to AnomAa ornata Gabb. 

 The form identified by Gardner as Anomia ornata Gabb, from near 

 Friendly, Prince Georges County, Md., may be only an individual 

 variant of Anomia forteplicata Gardner, but a full suite of specimens 

 would be necessary to determine this relationship. Apparently both 

 the Maryland species recognized by Gardner average much smaller 

 in size than the typical Anomia ornata Gabb, some specimens of which 

 are more than 40 mm. in length. 



Locality. — From the new Rocky Point quarries, a mile northeast 

 of Rocky Point station, Pender County, N. C. Collected by L. W. 

 Stephenson, May, 1926. 



Geologic position. — Upper Cretaceous, upper part of Peedee for- 

 mation, upper part of Exogyra costata zone. European equivalent, 

 upper Senonian (Maestrichtian). 



Type material. — Includes the holotype, United States National Mu- 

 seum Cat. No. 73432, and three smaller, younger specimens Cat. 

 No. 73433. 



ANOMIA PENDERANA. new species 

 Plate 5, fig. 12 



Description. — Shell of moderate thickness, subcircular in outline, 

 strongly convex in the umbonal portion, flattening out toward the 

 margin. Beak broken but probably of moderate size and situated 

 more than a millimeter away from the margin. Dimensions of the 

 type, a left valve: Length, 33 mm.; height, 32 mm.; convexity^ 

 about 8 mm. 



