r; *, rz _ 



PHA00ID..O ( .i_.a.x-uji..A) ABGHOIrx'^..L'o n. sp. 



Pescrlptl on .- Shell small, sub orbicular, Tno^erately iiiflat- 

 e "^ ; : ' --dorsal niarf-in short, slightly excavated; slightly more 

 prorli^ced anteriorly; tmibones relatively low; lunule small, mocier- 

 atelj' in-presse'' ; ri.orsal areas iiff e rent i ate r1 hy the absence of 

 radial sculpture but rhe pos'; ' ; area obscurely raised, only 

 a radial line near the margin; radial sculpture coiisi sting of 



about e"- . . radial ribs, poorly 'defined on the I'ledia.. -'tion of 



the shell and near the niargins, separated by narrower, relative- 

 ly shallow interspaces; concentric sculpture of prominent, regul- 

 arly spaced ribs separated by interspaces of the sane width, fail- 

 ing to override the radials on the most convex portion of the 

 disk; hiixge heavy; inte: ' :f the valve obscurely undulatec! near 

 the rip->"^-" -'-. « in conformity with the e:.ternal radials; injaer ■'•-^-tral 

 m?rgin finely crenulated. 



Dimensions .- Lat. , 7 ram.; alt., 7 nm. ; semidiam., 2.5 mm.' 

 Remarks.- T>it^ characteristically sc^il-otured "3ell'ioin a is 

 represented by a single valve. Because of its larger size and 

 more typical sculpture it is sharply (differentiated from ?. actin ■! 

 On the c-^-'-^v hand, the sculpture is not as -■"^^<'< -■^^'^velo-pe'^ -9 on 

 the Duplin P. tuomeyi Dall (1) and its ■.Vaccamavv and 3aloosahatchie 



(1). Trans. V/agner Tree Inst. 3ci., Philadelphia, •'"^^ . '" , 

 6, pp. 1305-1386, pi. 52, fig. 1, 1903. 



