192 A. FE. Verrill—The Bermuda Islands; Geology. 
lated with brown, as shown by the figures on plate xxvii. But some 
of the fossils, as fig. 2, ¢, d, are also slightly flammulated, similar to 
some of the living ones, while the living ones, as fig. 1, ¢, g, are 
often banded. The middle row of shells (figs. 1 and 2, e to h) in 
each figure show the range of variations in the umbilicus and base 
of each variety, while the lower row shows the rang? of variation in 
the form of the spire and aperture, and the angulation of the body- 
whorl. In fig. 2, g, the umbilicus is reduced to a small pore, while 
in fig. 1, e and g, it is large, yet all intermediate sizes occur, from 
2 COR Amer. 
Average specimens are about 20 to 22™™ in diameter, and 12 to 
14™™ high, but the larger ones may be 24 or 25™™ in diameter and 
14 to 16™™ high. Some of those with a depressed spire measured 
107" high and 19™™ in diameter; 10™™ high and 20™" in diameter. 
All these are adults with a thick callus on the inner lip. The last 
body-whorl is usually distinctly angulated and sometimes almost 
carinate. In the young the spire is nearly flat, the last whorl is 
carinate, umbilicus larger, and the color is flammulated. 
This variety would probably pass for a distinct species if inter- 
mediate forms were not found, or if it occurred in another region. 
The modern form seems to be a degenerate or depauperate descend- 
ant, altered by a less favorable environment. 
The living form of this species has been erroneously referred to 
several genera, as shown by Pilsbry in Proc. Phil. Acad., 1888, p. 
289, where he has figured the jaw, radula, and genital organs. The 
following references apply chiefly to the living form (var. bermuden- 
sis), which will doubtless be found in the more recent zolian lime- 
stones and dune sands, if sought for. 
Poecilozonites bermudensis Pilsbry (pars), Proc. Acad. Sci. Philad., 1888, 
p. 289, pl. xvii; the same in Heilprin, ‘‘The Bermuda Islands,” pp. 196, 
198, pl. 16, figs. E (young), C (radula); N, O, (genital organs), 1889. 
Pilsbry, Proc. Phil. Acad. Nat. Sci., 1889, p. 85 (anatomy and synonymy) ; 
Trans. Conn. Acad. Science, x, p. 499, 1900. 
Verrill, these Trans., xi, p. 728, 1902; ‘‘ The Bermuda Islands,” p. 316 [728]. 
Zonites bermudensis Binney, Annals N. York Acad. Science, iii, p. 86 (jaw 
and radula). 
Piate XXVII, ricures 1, a-l. 
In our plate twelve recent specimens are figured from photo- 
graphs. They show marked variations in color, elevation of spire, 
size of umbilicus, shape of aperture, and extent of angulation of the 
body-whorl. 
