8 
MONOGRAPH OE THE GENUS STROPHIA. 
pointed cylinder, with the first and second whirls the largest, then 
the third whirl is a little smaller, and from this, the shell slopes grad- 
ually to a point, forming an angle of fifty-five degrees. There are 
sixteen striations to the first whirl; they are not prominent, are rather 
irregular, not arranged in lines, nor furrowed, but rounded and polished, 
are narrow, the interspaces being twice as wide as they, and slightly 
inclined from left to right. 
Aperture large and open, about as wide as high, not at all con- 
tracted at the entrance. The lower tooth is small, about .07 long, and 
about half as high as long ; it is set well back about twice its length 
from the frontal bar ; it is about central in position. The upper tooth 
is about the same height but extends backward around the column. 
Margin not produced forward beyond the diameter of the shell, but 
is somewhat inclined to the right beyond the side of shell. It is thin, 
(about .03 ) considerably hanging, projecting outward about .10, and 
somewhat rolled over, but the edge is smooth. The frontal bar is not 
well developed and the striations appear quite prominently within it, ex- 
tending backward into the shell. 
DIMENSIONS. 
Size of typical specimen, 1.35 by .40. Largest specimen, 1.36 
by .47 ; smallest, 1.27 by .35. Greatest diameter, .48 ; smallest, 35. 
Longest specimen, 1.38 ; shortest, 1.25. 
OBSERVATIONS. 
There is some individual variation in the inclination of the mar- 
gin ; some specimens having this about straight. There is one de- 
veloped form. 
Form No. 1. More slender in form, and rather more acutely 
pointed, and while the striations are more numerous above, twenty-five 
to the first whirl, they are nearly or quite absent on the lower whirls. 
I found two of this form in the museum collection, but I find that out 
of seven shells received from another source, also labeled Havanna, 
that all, with a single exception, are of this form. Thus it may be 
possible that this will prove to be a sub-species, inhabiting a locality 
apart from the typical form. 
This species may be distinguished from all of the other flanging- 
mouthed Cuban shells, yet mentioned, by the open mouth, large 
size, and white, unflecked color. For comparison with S. infanda of 
Shuttleworth, see that species. 
I found these shells bearing the label “ Pupa mumia, Havanna 
Cuba. 7 ’ 
