28 
MONOGRAPH OF THE GENUS STROPHIA, 
SUB-GENUS 9. UMBONIS. 
Shell turret-shaped, lower tooth central, more than three 
TIMES AS LONG AS HIGH. STRIATIONS, GREATLY ENLARGED, BULGING 
AND WIDENED IN THE MIDDLE, THESE AND THE INTERSPACES BETWEEN 
THEM ARE CROSSED BY FINE, TRANSVERSE DEPRESSIONS. APERTURE CON- 
TRACTED, WITH A SLIGHTLY FLANGING MARGIN. UMBILICUS, CLOSED. 
This is the most strongly marked group of Strophais which I have 
seen and is characterized by the turret-shaped shell, large, wide apart 
striations which are enlarged in the middle, giving each whirl a very 
abruptly bulging appearance. 
But the most remarkable character of all, is the transverse lines or 
depressions which cross the shell everywhere, excepting on the first three 
whirls. This must be an old type of Strophia. or rather this singular feat- 
ure must be one of the most primitive, for we find in many shells, even 
of widely different species, a tendency to revert toward this. See remarks 
under S. dimidiata. There are but two known species of this interesting 
sub-genus. 
70 5TR0PHIA SCALARINA Pfr. et Gundl. 
Embossed Strophia. 
Plate VI, fig. 4 front, fig. 5, side view of type. 
Pupa scalarina, Pfeiffer and Gurullach, Maiak. Blat., 1861 p. 19. 
DESCRIPTION. 
Sp. Ch. Size, small. Shell, thin, striations present. Whirls 10, 
the upper of which, including margin, being about equal to the next 
four all together. 
Form of shell, an oblong turret, with the first whirl the largest, 
from this the shell slopes to a rather acute point, forming an angle of 
forty-five degrees. The striations are few, twelve to the first whirl, 
very prominent, bulging, and enlarged in the middle, irregular, but 
not arranged in lines. The transverse, depressed lines appear on all 
but the four lower whirls, and are deeper on the upper whirl than else- 
where ; they are about an equal distance apart, excepting in the middle 
of most of the whirls, where there is a band where they are absent ; 
there are about twenty on the first whirl, directly below the aperture. 
The depression between the striations is about as wide as they, and 
the band, in which there are no transverse lines, also crosses these, but 
is narrower here. In the center of some of these depressions, are 
slight, longitudinal ridges or sub-striations. The suture is deep. 
