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EPITONIIDAE 163
Vo X.0 % inch in length, dull whitish, 7 to 8 whorls, moderately slender.
Characterized by the smoothish sides of the whorls and by the spiral ramp
below the suture which bears 12 to 14 short, horizontal ribs per whorl.
Early whorls may have weak axial ribs running from suture to suture. Spinal
sculpture of microscopic, numerous scratches. O. crenimarginata Dall is this
species. Very common among rocks at low tide.
Genus Ainaea H. and A. Adams 1854
Amaea iititchelU Dall Mitchell's Wentletrap
Texas coast to Yucatan.
Plate 2zi\ figure 4oh
I % to 2% Inches in length, thin but strong; without an umbilicus. With
about 1 5 rather strongly convex, pale-ivory whorls which have a dark brown-
ish band at the periphery and a solid brown area below the basal ridge.
About 22 low, irregular costae per whorl. Numerous spiral threads are fine,
and produce a weak, reticulated pattern. Not very common, but occasionally
washed up on Texas beaches.
Subgenus Scalina Conrad 1865
{Ferminoscala Dall 1908)
Amaea retifera Dall Reticulate Wentletrap
North Carolina to both sides of Florida to Barbados.
Figure 4od
I inch in length, elongate, thin but strong; with about 16 whorls which
are beautifully reticulated by strong, sharp threads. Color straw to palebrown
with 2 light and narrow brownish bands, one above and one below
the periphery. Commonly dredged off Florida from 13 to 120 fathoms.
Genus Epitonhnn Roding 1798 (Scala)
Subgenus Epitonium s. str.
Epitonium krebsi Morch Krebs' Wentletrap
South half of Florida to the Lesser Antilles.
Figure 406
V2 to % inch in length, stout. With umbihcus fairly narrow to wide, and
very deep. 7 to 8 whorls attached by the costae (10 to 12 per whorl).
China-white, rarely with a trace of brown to pinkish brown undertones.
Moderately common from a few feet to 160 fathoms. E. swifti Morch and
E. contorqiiata Dall are this species.
Do not confuse with E. occidentale Nyst (Western Atlantic Wentletrap)
from the same areas. It is not so stout, has 1 2 to 15 costae per whorl, a very