﻿6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 59 



sculptured with fine axial or radiating subequal plications, which 

 are strongest on the base and least prominent on the periphery. The 

 umbilical region is covered by a rather thick, smooth callus. The 

 aperture is very oblique, rounded, the outer lip thin, simple, the 

 labrum with a thick layer of enamel. Max. diameter of shell 2.0; 

 minimum diameter 1.6; height 1.0 mm. 



Station 5850. Types, U. S. Nat. Mus. 214360. 



There are a number of species related to this one from the same 

 region and from the so-called Pliocene (Gabb) of Costa Rica, but 

 the sculpture of T. goethalsi is more complex than in either of the 

 others. It is not uncommon in the marl about Limon Bay, Panama. 



CADULUS VAUGHANI, new species 



Shell small, white, the girdle or maximum swelling at about the 

 anterior fifth or sixth of the shell, behind which it tapers evenly, 

 with a very slight arcuation to the posterior end. The latter in per- 

 fect specimens is circular, the margin divided into four, short, tri- 

 angular teeth or processes by four indentations opposite one another, 

 of which the lateral notches are most conspicuous. The intervening 

 projections are frequently broken or worn away and then the aper- 

 ture like the anterior aperture appears simple and circular. The 

 latter is slightly oblique with the margin on the concave side more 

 produced. The surface is polished as usual in the genus. Length 

 6, diameter at girdle 1.0, at anterior end 0.8, at posterior end 0.4 

 mm. 



Station 5850. Types, U. S. Nat. Mus. 214361. 



This is perhaps nearest to C. dentalinus of Guppy, but has the girdle 

 differently situated and is less attenuated. It occurs in large num- 

 bers in the mud of the Pleistocene stratum. 



The geological position of the following species is less definitely 

 fixed and they may probably prove to be older than the preceding 

 forms. 



EPITONIUM (STHENORYTIS) TOROENSE, new species 



Shell turbinate of somewhat less than five rapidly enlarging 

 whorls; not umbilicate, the suture impressed, the whorls rounded, 

 crossed by nine to thirteen heavy, backwardly appressed, broad 

 varices, which show a tendency to coalesce with one another; the 

 average number in fourteen specimens is ten, and at the shoulder 

 when in perfect condition each is produced into a short but acute 

 spinose process; on the base the varices merge into one another 

 toward the axis of the shell where they form a solid mass; the 



