16 
DESCRIPTION OF SPECIES. 
tooth measures .18 in length by .05 high, is placed a little to the right 
of the center, and the upper placed slightly above it, is long, making a 
complete turn around the column, but is not very prominent. 
The margin is not produced forward quite as far as the diameter 
of the shell and is slightly inclined backward at the top; it is not greatly 
thickened, measuring .05, and the posterior portion is produced back 
into a rather blunt and not prominent edge. The frontal bar is well 
developed. An interesting series of immature specimens of this species 
not only show that the shell is greatly thickened after it becomes nearly, 
or quite, fully grown, but also show that the frontal bar is not formed 
until the margin is completed. The animal is not very large; eye pe- 
duncles, .15 long; tentacles, .05. 
Color, white, slightly tinged with purplish or bluish; internally, 
purplish brown which becomes paler on the lower wall of the aperture, 
and fades on the upper walls and teeth, into flesh color. Color of animal, 
very pale brown, with the back wholly brown of a darker shade. 
DIMENSIONS. 
Size of types, .94 by .40 and .94 by .38. Largest specimen, 1.07 by 
.45; smallest, .80 by .33. Greatest diameter, .45; smallest, .33. Longest 
specimen, 1.07; shortest, .80. 
OBSERVATIONS. 
The type described is constant in a very large percentage of speci- 
mens, the chief variation being in size, and this, excepting in the smallest 
specimen given which is an isolated example, and may even prove a 
distinct species, is not great. Two different forms appear; one, cylin- 
drical and proportionately slender, having the first three whirls of the 
same diameter, and with the aperture inclined considerably to the right, 
and one wherein the form is proportionately thicker than the type, with 
the sutures very deep. The color is uniform, some pinkish tipping ap- 
pearing which is, however, due to abrasion. 
Known from all others, by the pointed apex, small size, absence of 
striations, long teeth, and white color. 
DISTRIBUTION AND HABITS. 
Under Habits and Distribution in the preceding species, I have 
spoken of two paths that crossed the island of Little Cayman, and these 
two ways formed a junction a few hundred yards from the south shore. 
Near this junction, the western most crossed a small open patch of 
ground, the borders of which were surrounded with quite low bushes. 
The bushes that grew on the south side of this little natural clearing, 
