﻿24 Bulletin 21 142 



Named in honor of Dr. Dall of the Smithsonian. 



A sty? is Aldrichi, n. s. 



PI. VI, fig. 3. 



Shell .of moderate size, polished, with the general shape of A. 

 perfervida Dall, but characterized by the presence of ten or more 

 vertical riblets on the body- whorl just below the suture. Earlier 

 wdiorls eroded, remaining whorls five, outer lip with about eight 

 lirse within and a slight external varix near the margin, canal 

 reflexed ; columella with five weak denticles and a moderate 

 callus on the anterior part. Length of decollate shell 14 ; great- 

 est width 6 mm. 



Chipola marls, Bailey's Ferry, Florida. 



Cornell University collection. 



Dedicated to Mr. T. H. Aldrich of Washington. 



Astyris Aldrichi var. nemoralis, n. var, 



PI. VI, fig. 4. 



Shell resembling the typical form from Bailey's Ferry but 

 smaller, and with riblets on the next to the last as well as on the 

 last whorl. Earlier whorls eroded, remaining whorls three ; 

 spiral sculpture of a varying number of impressed lines extending 

 from the base of the shell to about midway or less up on the 

 body-whorl ; transverse sculpture of (on the last whorl ten to 

 eleven) narrow, nearly straight, rounded riblets best developed at 

 and near the sutures and becoming obsolete a short distance below 

 them. These riblets are present only on the last whorl and a half 

 and do not appear on the earlier whorls. Outer lip with a varix 

 near the margin and with about eight sharply-cut lirae within ; 

 aperture narrow ; canal reflexed ; columella with about six den- 

 ticles and a thin callus. Length of decollate shell ro ; greatest 

 width 5 mm. 



Oak Grove, Florida. 



Cornell University collection. 



