MONOGRAPH OF THE GENUS STROPTIIA. 
158 
the 
Fig. 48. 
narrow, not as wide as the interspaces, quite irregular, smoothly 
rounded, and inclined to be polished. The} 7- are slightly inclined from 
right to left, and well arranged in lines. 
Aperture, rather large, quite open, and not contracted at 
entrance. Lower tooth, quite promi- 
nent, about .05 high, and not quite 
twice as long as high, slightly elevated, 
and set back about once its length 
from the frontal bar. Upper tooth 
well developed, about half as large as 
the lower and is placed a little ab,ve 
the top of the lower. 
Margin, produced forward abiut 
as far as the diameter of the shell, is 
placed quite nearly in the middle of 
the shell, and is only slightly inclined 
to the right. It is about twice as 
thick as the shell, is beautifully 
beveled, and projected backward into 
a blunt edge. The frontal bar is slightly developed, and the striations 
are indicated within it. 
Color of shell, externally, yellowish ash, striations and all ; inter- 
nally, brownish, becoming paler on the teeth and margin. 
n 
Strophia neglecta agava. 
tide view of type. 
DIMENSIONS. 
Size of type, 1.21 by .47. Largest specimen, 1.35 by .50; 
smallest, .93 by .42. Greatest diameter, .50 ; smallest, .42. Longest 
specimen, 1.35; shortest, .93. 
OBSERVATIONS. 
Individual variation in this sub-species is toward a smaller form, 
with coarser, mere widel} T -apart striations, thus passing through a 
small percentage of specimens into typical S. neglecta, and on the other 
hand, into a larger, heavier form, with striations about as in ..the type. 
This well-marked sub-species differs from typical neglecta in the 
larger size, thicker margin, and more numerous striations. From 
all other Strophias it may be known by the acute apex and singular 
color. 
