13 
MONOGRAPH OF TI1E GENUS STROPHIA. 
in the interior of the shell, are quite smooth even on the upper whirls. 
For comparison between this and other sub-genera, see remarks 
under sub-generic characters which are to follow. Strophia mumiola 
belongs to this group also the next species, S. media. 
[ Note ; I have purporsely avoided mentioning to what sub-genera 
I consider some of the shells already described in this volume should be 
placed, as I have not yet seen sufficient material to fully warrant so do- 
ing- ] 
Note on Strophia mumia. 
I found a large number of shells in the collection, which I have at 
present referred to this species, labeled as coming from Cabo Cruz, 
Cuba. This definitely fixes the locality for one form of the sub-genus 
and other similar species, ( of which I have little doubt there are several) 
will probably be found to occur quite near. Unless otherwise con- 
vinced by the most unimpeachable evidence, it will be well for con- 
chologists always to keep in mind that as species among Strophia, are, 
wdth very few exceptions, much restricted in distribution, sub-generic 
groups will also be found to be restricted. For further remarks in this 
connection, see observations under Strophia regia. 
All of the specimens of what I have for the present considered as 
S. mumia in the museum collection, about 150 in all, although differing 
from the type form described and figured in Yol. 1, page 190-91 in hav- 
ing a less flanging margin, agree in general character, and exhibit no 
marked variation, but there is one well developed form given below. 
Form No. 1. Smaller than the others, 1.30 by .50, otherwise 
similar. There are about ten per cent of this form. 
64 STROPHIA flEDIA Novo. 
Medium Strophia. 
Plate IY, fig. 3, front, fig. 4, side view of type. 
DESCRIPTION. 
Sp. Ch. Size, medium. Shell, thick and heavy. Whirls, 10 
the upper of which, including margin, is not quite as long as all of the 
remaining whirls together. Examined 2 specimens. 
Form of shell, an obtusely pointed cylinder, with the first two 
whirls equal in diameter, the fourth is but little smaller, then the shell 
slopes to an obtuse point, forming an angle of about sixty-five degrees. 
The striations are few, prominent, but more so on the lower whirls 
than on the upper, eighteen to the first whirl, they are regular not 
