194 
MONOGRAPH OF THE GENUS STROPHIA. 
shorter and a little wider than in that species; its right lip is thick 
and turned up at the extremity like a tumbling cap, the left is situated 
as in the preceding (species) and is placed (stuck) on the convexity of 
second whirl. It presents in the interior a similar fold, whose size is 
proportional to that of the shell. There is a second fold lower than the 
first in the bottom of the opening at the base of the collumella which 
seems to hang from the depths of the umbilicus. The latter is situated as 
in the preceding species but is more open, and also deeper. This shell 
is white on the outside, reddish, or red, in the opening and on the edge 
of the lips, and reddish about the top of the cone, it is marine, and is 
found in American Seas. 
It is evident from the foregoing description that the author had 
some species of Strophia that had two teeth, that is, two prominent teeth, 
as in the majorit} r of speies the of genus, not as in uva, that was about 
an inch and a half long, by a half inch in diameter, that was cylindrical 
in form, but narrowed to a point from the fifth whirl, it was also pro- 
vided with striations ( cotes) which are oblique and separated by about 
equal spaces, the margin is flanging, resembling a tumbling cap, it is 
white externally, but reddish in the opening and on the margin. 
Such in brief are the only characters which will be of any service 
in determining the species that the author had in hand, but unfortunate- 
lytliese will answer for several Cuban shells. 
As remarked, authors in endeavoring to fit this too general descrip- 
tion to some species of Strophia have failed to agree. A hasty review 
of some of the principal works on the genus will serve to illustrate just 
how widely authors have disagreed. 
Strophia mumia was described in 1792, but no figure was given of 
it at that time, and the first one of a shell intended to represent this 
species is an Illustrated Introduction to Lemarke’s Conchology, by Ed- 
mund A. Crouch, London, 1827, Plate XY, No. 2. Here is given an 
unmistakable portrate of the species that I have named S. cinerea, a shell, 
in which the development of the margin is reduced to nearly or quite a 
minimum, in place of being large and flanging. It is not white without 
nor reddish within, but the other characters given by Bruguiere might 
apply to this shell yet they are really generic, and will also apply to any 
Strophia with striations. 
Next we turn to the Histore Naturelle Generale et Particulere des 
Mollusques, par D. Be Ferussac et, G. P. Deshayes, Paris, 1820-1851, 
Yol. II, Plate 153, Fig. 4, 5, k 6, where is given figures of what the au- 
thors consider mumia. No. 4 is a mottled shell, but too slender and 
pointed for typical mumia, and is what is oftenest given as S. crysalis, 
both in fiomres and in collections, while 5 & 6 are white shells of quite 
