INSTITUTE OF SCIE^•CE, PHILADELPHIA. I3 



Strophia (Eostrophia) anodonta n. s. 

 Plate I, figures Sc, 8d. 

 Shell subcylindrical, obtuse, nine or ten-whorled, apparently smooth, but 

 under a magnifier showing fine parallel grooves and wrinkles extending ob- 

 liquely fi-om suture to suture, in harmony with the incremental lines ; suture 

 distinct, not deep ; base full and rounded with a chink in the imperforate um- 

 . bilical region ; aperture slightly expanded, rounded, the lip strongly reflected, 

 so that it is rounded in front and sharp-edged behind ; a thin callus connects 

 the inner and outer lips over the body, but there are neither parietal nor col- 

 umellar laminae. Alt. 24.0; max. diam., excluding the aperture, 11. o; diam. 

 of aperture from outside to outside of lips 9.0 mm. 



Ballast Point, Newman, Shepard, Dall and Burns; Old Tampa Bay, shore, 

 Burns. 



Strophia (anodonta var. ?) floridana Dall. 

 Plate I, figure 6. 

 Shell resembling the preceding and with the same number of whorls, but 

 shorter and stouter, and with a somewhat larger aperture proportionally. Alt. 

 22.0; max. diam. of spire ii.i; of aperture 9.0 mm. 

 Ballast Point ; Dall. 



This interesting form has been compared to Strophia incana Binney, which 

 it resembles in outline but not in sculpture, while 5. incana has both parietal 

 and columellar laminae. 



An examination of a couple of dozen more or less perfect specimens fails 

 to show any indications of laminae and there can be little doubt that the spe- 

 cies is normally edentulous. The variety is sufficiently different in appear- 

 ance to be worth naming, but such differences are not of specific value among 

 the recent Strophias. 



Family CYLINDRELLID^. 

 Genus CYLINDRELLA Pfeiffer. 

 Section Gongylostoina Albers. 

 Cylindrella floridana n. s. 

 Plate I, figure 6 a. 

 Shell resembling C. variegata Pfr., but larger and more coarsely sculptured ; 

 whorls eight after decollation, shape fusiform, whorls gently increasing in 

 diameter from the decollation to the sixth whorl, which is the largest, after 

 which the diameter becomes less; suture distinct; whorls sculptured with fine 

 transverse ridges, separated by equal or wider interspaces, which cross the 

 whorl from suture to suture, with rare irregularities; base subcarinate in con- 

 tinuation of the line of the suture and on the last whorl slightly constricted 

 above this carina ; umbilicus none ; aperture subcircular, oblique, with reflected 

 lip, internally simple, smooth. Alt. of shell 11.5 ; max. diam. of spire 4.0 mm. 



