﻿32 Bulletin 21 150 



Height of shell 3.5 ; greatest width 5 mm. 

 Specimens of this species were described in 1892, but not 

 named by Dr. Dall to whom the shell is now dedicated. 

 Chipola marls, Bailey's Ferry, Florida. 

 Cornell University collection. 



Calliostoma Palmer i, u. s. 

 PI. VIII, fig. 4. 



Shell with six whorls, the two nuclear smooth, inflated, the 

 four subsequent whorls delicately ornamented with very finely 

 beaded spirals which are sometimes separated by smooth spiral 

 threads or by alternating smaller beaded spirals. Basal sculpture 

 of nine prominent raised threads separated by much finer alter- 

 nating lines. 



This very pretty shell is undoubtedly the ancestor of Callios- 

 toma limulum Dall from the Pliocene of the Caloosahatchie and 

 Shell creek, Florida. The resemblance is so great that if limulum 

 had not been described from a later period it would have seemed 

 best to have placed the Chipola shell as a variety of that species. 

 The main difference between the shells lies in the fact that while 

 in the Chipola shell each fourth row of beading is much more 

 prominent than the rest, in the Pliocene shell all the primary rows 

 of headings are sub-equal. 



Height of shell 7 mm ; greatest width 7 mm. 



Chipola marls, Bailey's Ferry, Florida. 



Cornell University collection. 



Lacapinella Cornelliana, n. s. 

 PI. VIII, fig. 5- 

 Shell elliptical, compressed, foramen elliptical ; sculpture of 

 sixteen, strong, radial ribs with sets of two or four intercalary 

 radiating threads ; these and the ribs are crossed by about thir- 

 teen more prominent concentric threads which are creuulate at 

 their intersections with the ribs ; interior of shell smooth ; fora- 

 men with a distinct elliptical, internal callus. 



Length of shell 11 ; width 7.5 ; height 2 mm. 



