1921] NATURAL SCIENCES OF PHILADELPHIA. 407 



Area tolepia scapularis Pils. and Johns. Plate XXXIX, flgs. Vi, 14. 



Pioc. A. N. 8. Phila. 1917, p. 189. 

 Area tolepia crassicardinis Pils. and Johns. Plate XXXIX, flgs. 11, 12. 



Proc. A. N. S. Phila. 1917, p. 189. 



Area cyclica Pils. and Johns. Plate XXXIX, flgs. 15. 16. 



Proc. A. N. S. Phila. 1917, p. 189. 



Area perfaceta Pils. and Johns. Plate XXXIX, flgs. 17, 18, 19, 20. 



Proc. A. N. S. Phila. 1917, p. 190. 



Area pomponiana Pils. and Johns. Plate XLII, flgs. 4, .5, 6. 



Proc. A. N. S. Phila. 1917, p. 190. 



Area multilineata Gabb. Plate XLII, flgs. 13, 14. 



Area muUlUneala Gabb, Trans. Amer. Philos. Soc, xv, 1873, p. 254. 



This small, plump shell has triangular rounded contour, the an- 

 terior end narrowly, the posterior broadly rounded. Sculpture of 

 many radial ribs crossed by concentric threads over ribs and inter- 

 vals. In the median fourth the ribs widen towards the basal border 

 and the intervals remain simple, but over the rest of the valve inter- 

 stitial riblets arise in the intervals, about midway, and many of them 

 become as large as the primary ribs near the basal margin. The 

 cardinal area is narrow and smooth. Tooth row continuous, with 

 9 and 11 teeth, those of the posterior part strongly obUque, in the 

 anterior part slightly oblique. 



Length 10, alt. 9.5, diam. of right valve 4 mm. 



Type and three other right valves are no. 2652 A. N. S. P. 



Fig. 36. Area maoica. 



Area maoica Maury. Text-flg. 36. 



Area cxmeolus Pils. and Johns., Proc. A. N. S. Phila. 1917, p. 191. 



The figure represents the type of A. cuneolus,, which is apparent- 

 ly a synonym of A . maoica Maury. 



