108 
MONOGRAPH OF TIIE GENUS STROPH1A. 
Fig. 
OQ 
' ><[>. 
D 
Form of shell, inclined to be cylindrical, the first and second 
whirls being nearly equal in diameter, and the third is but little 
smaller, then the shell slopes rather quickly to a quite blunt point, 
forming an angle of sixty degrees. The striations are quite nume- 
rous, twenty-six on the first whirl, not very prominent, rather 
irregular, and not arranged in lines ; 
they are slightly inclined from right 
to left, are narrow, hence the inter- 
spaces are wider than the promi- 
nences. The striations are not 
furrowed, but are rounded and 
smooth. 
Aperture, rather small, but 
measures a little more just within 
than at the entrance. Lower tooth, 
not very prominent, .05 high by .10 
long, and its position is about cen- 
tral ; the upper is absent, being 
represented by a slight protuber- 
ance. 
Margin, not produced forward as far as the diameter of the shell, 
and is very slightly inclined to the right, but not beyond the side ; it 
is not thickened, measuring .04, but the outer posterior portion is 
produced backward into a sharpened edge, but which is not rolled 
downward. The frontal bar is quite distinct, and the striations are 
completely interrupted by it, never appearing within. 
Color of shell externally, white, prominently and plentifully 
flecked with reddish brown of varying shades ; internally, purplish 
brown, fading into yellowish white on the teeth and margin of the 
aperture and tooth. Apex, pale horn color. 
A 
B 
c 
Strophia curtissii. A, side view of young ; 
D, end view of the same ; B, side view of 
type ; C, front view of same. 
DIMENSIONS. 
Size of type, .98 by .40. Largest specimen, 1.28 by .42; smallest, 
.87 by .36; greatest diameter, .45; smallest, .35. Longest specimen, 
1.25 ; shortest, .78. 
OBSERVATIONS. 
Individual variation from the typical locality is not great. There 
is a tendency to vary somewhat in Seekings, some specimens being 
