﻿28 Bulletin 21 146 



two nuclear are smooth ; varices about nine in all, only the two 

 on the bocy-whorl being pronounced ; spiral sculpture on the 

 upper whorls of three principal, beaded, primary threads sepa- 

 rated by nearly equal inter-spaces in each of which lies a much 

 finer, wavy, secondary thread ; spiral sculpture on the last whorl 

 of five beaded threads (that nearest the suture being the most 

 prominent) with alternating finer, sinuous threads, while on the 

 base are about eight fine spirals ; transverse sculpture on the 

 earlier six or seven whorls of numerous, narrow, riblets which 

 become obsolete on the later whorls; aperture oval; outer lip 

 usually with a varix ; canal short, recurved. Length of shell 

 11 ; greatest width 4 mm. 



Bailey's Ferry, and Oak Grove, Florida. 



Cornell University and Mr. Aldrich's collection. 



Named in honor of Dr. Ida Ogilvie of Barnard College, 

 Columbia University. 



Isapis Myttonis, n. s. 

 PI. VII, fig. 4. 



Shell with five convex whorls ornamented with a beautiful 

 cancellation formed by the crossing of the raised spiral bands and 

 the longitudinal riblets. Number of spiral bands on the whorl 

 preceding the last three, on the last whorl seven. These are 

 crossed somewhat obliquely by less prominent longitudinal riblets 

 and are slightly nodular at the intersections. Suture distinct ; 

 spire acute ; aperture oval ; outer lip simple, crenulated within 

 by the seven revolving elevated bands of the exterior ; columella 

 arched, bearing within a single central tooth. Length of shell 8 ; 

 of aperture 3 ; greatest width 4 mm. 



This exquisite little shell is entirely distinct from /. Dalit 

 Whitfield of the Miocene of New Jersey. 



Chipola marls, Bailey's Ferry, Florida. 



Cornell University collection. 



Litiopa palceosargassina, n. s. 

 PI. VII, fig. 5. 

 Shell small, thin and delicate, polished, whorls four exclu- 



