ART. 10 CEETACEOITS FAUNAS OF THE CAEOLIN"AS STEPHEIS-SOJ? 15 



The surface has been smoothed off somewhat by corrosion, but the 

 ribs are apparently not very prominent, are rounded, differ consid- 

 erably in strength, are in general much narrower than the interspaces, 

 and bear faint irregularly spaced nodes ; there is evidence of numerous 

 faint lines between the ribs. 



Remarks. — The ribs of this species are much finer and more regu- 

 larly spaced than in AnomAa Tnajor Stephenson, and it seems unlikely 

 that it can be an individual variant of that species. The species does 

 not appear to be very closely related to any described Coastal Plain 

 species. 



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 forma- 

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

 upper Senonian (Maestrichtian) . 



Type material. — The species is based on one specimen, United 

 States National Museum Cat. JN"o. 73434. 



PHOLADOMYA SUBLEVIS, new species 



Plate 6, figs. 1, 2 



1923. Pholadomya Uttlei Stephenson (in part), North Carolina Geol. and Been. 

 Survey, vol. 5, pp. 247-249, pi. 63, figs. 3, 4 (only). 



Description. — Shell relatively small, equivalve, inequilateral, elon- 

 gated, subelliptical in outline, moderately convex, broad in the um- 

 bonal region. The shell has a slightly swollen appearance toward 

 the lower anterior extremity. The two valves gap slightly ante- 

 riorly, but are almost closed posteriorly. Beaks, incurved, approxi- 

 mate, situated about 0.3 the length of the shell from the anterior 

 extremity. Dimensions of the tjipe: Length, 61 mm.; height, 36 

 mm. ; convexity, 25 mm. 



Hinge long, straight, anterior margin rather sharply rounded 

 below; ventral margin very broadly rounded, becoming almost 

 straight; posterior margin sharply rounded at the extremity which 

 is about the midheight. 



Surface marked by 13 or 14 radiating costae which, as shown by 

 the external mold of the paratype, are weak and narrow, becoming 

 obscure on the antero- and postero-dorsal slopes ; the costae are some- 

 what irregularly spaced, the widest spacing being back of the mid- 

 length of the shell. 



Remarks. — The species is based on two specimens, the larger of 

 which is named the holotype. The paratype was figured in the paper 

 cited in the synonjrniy, and was questionably regarded as a young 

 individual of PlioladoTnya Uttlei Gabb ; the holotype shows that the 



