4 
MONOGRAPH OF THE GENUS STROPHIA. 
Margin, not produced forward as far as the diameter of the shell. 
It is very slightly inclined to the right, but not beyond the side of the 
shell. It is exceedingly thin, measuring rather less than .02, is only 
slightly flanging, being extended outward about .04, it is nut rolled 
over and the edge is only slightly rounded. The frontal bar is very 
slightly indicated, consequently the striations pass with very little 
diminution of size directly into the interior of the shell, and a section- 
ized specimen shows that they continue quite to the apex. 
Color of shell externally bluish white, beautifully marked with 
rather longitudinal patches of deep purplish brown which often over- 
lie the striations as well as the interspaces between them. These brown 
marks are encroached upon on either side by alternating lines of white 
which often penetrates nearly through this brown causing it to appear like 
pen markings made with brown ink. This semblance is heightened by 
the fact that the brown lines are not often broken through. Internally 
the color is rather deep purplish brown, paler on the margin. 
DIMENSIONS. 
Size of type, 1.30 by .47. Longest specimen 1.30 by .50; small- 
est, 1.05 by .35 ; greatest diameter, .50, smallest, .35 ; longest speci- 
men, 1.30; shortest, 1.05. 
OBSERVATIONS. 
Variation consists in a tendency to produce a stouter form with 
the first three whirls equal, and also a form with less fleckings. 
Form No. 1. In addition to these varieties which must be con- 
sidered as simply individual, there is a well established form which 
consists of about twenty percent of the whole examined. These are 
smaller, shorter shells with 10 whirls, size, 1.05 by .35. The form 
and markings are similar to the type form. This fine species was 
tabled “Pupa chrysalis ’ ’ in the collection, but differs in several im- 
portant particulars from that species. It is smaller, with a smaller 
aperture which has a margin that is scarcely flanging at all, the 
teeth are much smaller, while the fleckings are much darker and are 
not as much broken into horizontal lines and the shell is more point- 
ed. 
These shells were labled as coming from “ Cardenas, Cuba, Andros 
M. de Cisneros [ collector ] received Jan. 14, 18782’ 
