142 
MONOGRAPH OF THE GENUS STROPHIA. 
Fig. 44, 
i 
Aperture, quite small, inclined to be rounded, and is slightly 
contracted at the entrance. The lower tooth is quite prominent, .04- 
high, and is about twice as long as high. It is set back about once its 
length, but is rather depressed below 
the level of the frontal bar, and is about 
central in position. The upper tooth 
is slightly developed, and is about on 
a level with the middle of the central 
tooth. 
Margin produced forward about 
as fir as the diameter of the shell, but 
not beyond it; it is thin, being about 
as thick as the shell behind it, and the 
edge is smooth and rounded, but is not 
produced into a thin edge. The frontal 
bar is well developed, and completely 
interrupts the striations. 
Color of shell, externally, dull 
white throughout; internally, pale 
brown, fading into white on the tooth and margin. 
m 
m 
R 
A,. S'trop»hia gray! gigantea. B, Strophut- 
grayi pumilia. 
DIMENSIONS. 
Size of type, Lobby .55. Largest specimen, 1.67 by .60; small- 
est, 1.40 by .55. Greatest diameter, .70 ; smallest, .55. Longest 
specimen, 1.67; shortest, 1.40. 
OBSERVATIONS. 
Individual variation in this sub-species is considerable, the incli- 
nation being toward an even larger form, with coarser and fewer 
striations. This large form has twelve whirls and the largest speci- 
men, of which the dimensions are given above, has thirteen whirls, 
thus exceeding the maximum number of any species hitherto 
examined by me. Aside from these variations there is a distinct form, 
as follows. 
No. 1. Similar to the type in general form arid size, but with 
narrower striations, which are less prominent, and the color is dull, 
ashy brown, with the striations creamy white, also darker brown 
internally. 
