MONOGRAPH OF THE GENUS STROPHIA. 
73 
16. STROPHIA NITELA Novo. 
Shining Strophia. 
Plate VII, 16 & 16a, shell, and Fig. 8, a, front b. left side,. 
DESCRIPTION. 
Sp. Ch. Size, medium. Shell, thick and rather heavy. Stria- 
tions, absent. Teeth, two, and very long. Whirls, 11. Examined 300 
specimens. 
Form of shell, a rather pointed oval, the first whirl is, however, the 
largest in diameter, the second is a little smaller, and each of the re- 
mainder is considerably less in size, thus the shell slopes rapidly to a 
rather blunt point, making an angle of about 55 
degrees. There are only faintly defined lines of 
growth that assume more prominence on the back 
of the upper whirl. Sutures, not deep. 
Aperture, large, open, measuring a little more 
just within than at the entrance. The lower tooth 
is prominent, .05 high, .24 long, and its position 
is just a little to the right of the center; the up- 
per is not as prominent but measures about .04, 
and makes a complete turn around the column. b a 
Margin, not produced forward beyond the di- Fig. 8. 
ameter of the shell, nor inclined to either side, is not greatly thickened, 
measuring .03, and the outer posterior portion is provided with a thin, 
not prominent edge. The frontal bar is well developed. 
Color of shell, externally, shining white; internally, purplish brown, 
which gradually fades into yellowish on the teeth and margin. 
DIMENSIONS. 
Size of type; 1.10 by .50. Largest specimen, 1.12 by .54; smallest, 
1.00 by .44. Greatest diameter, .52; smallest, .44. Longest specimen, 
1.12; shortest, .44. 
OBSERVATIONS. 
This species is very uniform in size and form, but some specimens 
show a tendency to become more obtuse. 
Known from the allied S. acuta by the larger size and more ob- 
tuse form, and from S. levigata by the smaller size and smooth sur- 
face. From all others by the long teeth and absence of striations. 
