1921] NATURAL SCIENCES OF PHILADELPHIA. 321 



Length 59. diam. 22. .3 mm., with 9^ whorls remaining (type). 



Type no. 2922 A. N. S. P. 



A paratype is figured, since the type, while larger, has the aper- 

 ture more broken. The dimensions given by Gabb were merely 

 approximate. He seems rarely to have actually measured his speci- 

 mens. 



Drills callistura PiL. and Johns. Plate XVI, flg. 12. 



Proc. A. N. S. Phila., 1917, p. 154. 



Drillia ischnatracta Pils. and Johns. Plate XVI, flg. 15. 



Proc. A. N. S. Phila., 1917, p. 154. 



Drillia scala Pils. and Johns. Plate XVI, flgs 16, 17. 



Proc. A. N. S. Phila., 1917, p. 155. 



Drillia hexapleura Pils. and Johns. Plate XVIII, flg. l, 

 Proc. A. N. S. Phila., 1917, p. 155. 



Drillia mimula Pils and Johns. Plate XVI, flg. 13. 



Proc. A. N. S. Phila., 1917, p. 155. 



Drillia esculenta Pils. and Johns. Plate XVI, flg. 18. 



Proc. A. N. S. Phila., 1917, p. 156. 



Diillia orthopleura Pils. and Johns. Plate XVI, flg. 19. 



Proc. A. N. S. Phila., 1917, p. 156. 



Drillia callistopleura Pils. and Johns. Plate XVI, flg. 6. 



Proc. A. N. S. Phila., 1917, p. 157. 



Drillia lissotropis dorsuosa Pils. and Johns. Plate XVIII, flg. 5. 



Proc. A. N. S. Phila., 1917, p. 157. 

 Type no. 2959 A. N. S. P. 



Drillia foveolata Pils. and Johns. Plate XVI. flg. 20. 



Proc. A. N. S. Phila., 1917, p. 157. 



Drillia parkeri (Gabb) Plate XVI, fig. 21. 



T. {Drillia) parkeri Gabb, Tr. Am. Philos. Soc. xv, 1873, p. 207. 



A much lengthened, fusiform shell, with plain, subacute axial ribs^ 

 and protractive growth-lines, which are strongly arcuate at the pos- 

 terior part. Eleven ribs are on the penult whorl. 2\ apical whorls are 

 smooth and convex. There is no spiral striation except towards the 

 end of the anterior part. The aperture is broken in both examples. 



Length 26.8, greatest diam. 7 mm., 11^ whorls. 



Type and another specimen are no. 2924 A. N. S. P. 



