﻿440 SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. X7 



We now come to a group of three or four species which are appar- 

 ently related to one another but which have been confounded under 

 the names of valid but different species to which they bear a super- 

 ficial resemblance. 

 Cerion (Strophiops) variabile new species. PI. lviii, figs, i, 6, 14. 



Shell varying greatly in size, the typical form handsomely axially 

 irregularly striped with opaque white, dark brown and light yellow 

 brown ; with two polished, partly transversely striate nuclear and 

 eight subsequent polished whorls, of which the last is more or less 

 distinctly ribbed, the preceding ones striate transversely or smooth, 

 without spiral sculpture, umbilical chink almost closed. The body 

 of the shell is subcylindric, the last whorl not contracted, sometimes 

 very blunt as if truncate, the apex evenly arcuately domed, the apical 

 portion not swollen. The peristome is simple, rounded, reflected, and 

 the parietal part when fully adult is thick and continuous ; the pa- 

 rietal lamina is sharp, and one-third of the whorl long; the axial 

 lamina is well developed only behind the pillar, the latter often 

 seeming destitute of a lamina when examined from in front. The 

 measurements are as follows (U. S. Nat. Mus., No. 120,011) : 



Height of Max. 



Shell. Aperture. Diameter. 



Type form 24-21 7 9.5-10.5111111. 



Var. saurodon .... 38 13 13 " 



Var. pupilla 155-20.0 50-6.5 5-5-6-5 " 



Cerion variabile var. saurodon now PI. lviii, fig. 14. 



Shell much larger and heavier than the type form, of about ten 

 whorls, with two nuclear whorls, the apex rather pointed, the last 

 five whorls regularly enlarging, the last the largest, its latter half 

 and base strongly ribbed, the umbilicus perforate, the parietal lamina 

 feeble. U. S. Nat. Mus., No. 120,011a, 

 Cerion variabile var. pupilla nov. PI. lviii, fig. 1. 



Shell small, thin and delicate, subcylindric, smooth, with two nu- 

 clear and six and a half subsequent whorls ; umbilicus closed ; pa- 

 rietal lamina sharply defined, the axial near the base of the pillar, 

 just visible; the peristome is simple, hardly reflected, the parietal 

 part thin ; the anterior part of the pillar markedly excavated. This 

 may prove with more abundant material to be a distinct species. 

 IT. S. Xat. Mus., Xo. 1 20,01 ib. 



This species was at first identified as C. inHatum Maynard (Acklin 

 Island), though the specimens were collected by the late Professor 

 Xorthrop at Red Bay on the northwest end of Andros Island. It 

 differs from inftatum by its cylindric or conic, not top-heavy form, the 



