10 
DESCRIPTION OF SPECIES. 
DESCRIPTION OF SPECIES. 
I. STROPHIA PANNOSA Novo. 
Ragged Strophia. 
Plate I, 13, animal; ib., 2, jaw. 
Plate II, 1 & 1b, shell; lc, section; Id, young. 
DESCRIPTION. 
Sp. Ch. Size, large. Shell, robust and heavy. Strations, pres- 
ent but coarse. Tentacles, short, about one fifth as long as eye pedun- 
cles; teeth, two, both very long. Whirls, 12. Examined 400 specimens. 
Form of shell, long oval, that is, the greatest diameter is through 
the second whirl; the first and third being a little smaller. Each whirl 
below is successively .05 smaller than the one above it, thus tapering to 
a blunt point, and forming an angle cf about .60 degrees. There are 
18 coarse, widely separated, irregularly formed striations, some of which 
are omitted, making the interspaces even wider. The striations are 
not arranged in continuous rows, and are inclined from right to left. 
The sutures between the whirls are not deep. 
Aperture, small, contracting rapidly within, where there are two, 
very prominent, long teeth, the lower of which extends backward into 
the shell .26, and is about .05 high, while the upper makes a complete 
turn around the column. The position of the lower tooth is about cen- 
tral and the upper is elevated just above it. 
The margin is not produced forward beyond the diameter of the 
shell but is greatly thickened, with the outer posterior portion provided 
with a thin, though not very prominent edge. The frontal bar is well 
developed, completely interrupting the striations; thus the lower wall of 
the aperture is smooth-. Animal, large; eye peduncles, .25 long; jaw, 
with lower portion covered with tubercles. 
Color of shell externally, white, with the apex pale purplish brown; 
internally, pale purplish brown, but this color does not extend beyond 
the teeth, fading gradually as it approaches them, so that both they and 
the walls beyond them are flesh color. Color of animal, pale brown, 
with a Y-shaped mark of dark brown on the back; see Plate 1, 13, upper 
and lower figures. 
