180 
MONOGRAPH OF TJIE GENUS STROPHlA. 
Fig. 60 . 
numerous and small, but perfect. Whirls, nine. Examined 1,000 
specimens. 
Form of shell, quite cylindrical, but with the first whirl a little 
smaller than the second and third, 
which are equal in diameter, then the 
shell slopes to a blunt point, forming 
an angle of sixty-five degrees. Sec- 
tions between the whirls very shallow. 
Whirls not bulging. The striations 
are numerous, thirty-seven to the first 
whirl, they are small, less than half 
c\ binders, but rounded and perfect for 
their entire length, and slightly in- 
clined from right to left, and are a little 
wider than the inte: spaces between 
them, while the entire shell is polished. 
Aperture, very small and open, 
elongated and arched, but scarcely 
higher than wide. Lower tooth, about .02 high, about as narrow as 
high, and three times as long as high and is set back a little more 
than Its length from the frontal bar. Upper tooth absent. 
Margin not produced forward quite as far as the diameter of 
the shell, it is thin, not as thick as the shell behind it, is smoothly 
rounded in front, and rolled backward into a blunt, but well-developed, 
edge. The frontal bar is only slightly indicated, but completely inter- 
rupts the striations. 
Color of shell, creamy white, externally, marked with wide, rather 
continuous, lines of reddish brown. Pale brown, within, fading into 
creamy white on the margin, leaving the tooth white, in contrast with 
the dark surround ins’. 
Strophia agristina. A, Iront, B, side 
view of type. C. margin, Form No. 3. 
DIMENSIONS. 
Size of type, .87 by .35. Largest specimen, 1.10 by .40; 
smallest, .55 by .32. Greatest diameter, .42 ; smallest, .32. Longest 
specimen, 1.10; shortest, .55. 
OBSERVATIONS. 
The } r oung of this species have, as a single tooth, the upper ; this 
is singular, as mature shells, with rare exceptions, have no trace of 
this tooth. 
