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EPITONIIDAE 161
be opisthobranchs and related to the bubble shells. Recent work on the
embryology and anatomy appears to justify this radical change in classifica-
tion. They are located in this book on page 288.
Superfa7mly EPITONIACEA
Family EPITONIIDAE
(Wentletraps)
Genus Sthenorytis Conrad 1862
Sthenorytis perno bills Fischer and Bernardi Noble Wentletrap
North Carolina to southeast Florida and to Barbados.
Figure 40c
I to 1^2 inches in length, solid, pure-white to grayish; angle of spire
about 50 degrees. The 10 whorls are globose and each bears about 14 very
large, thin, blade-like ribs. Apertural rim round, solid. A very choice col-
lector's item. It is the only member of the genus in Western Atlantic waters,
S. cubana Bartsch, 5. hendersoni Bartsch and 5. epae Bartsch being minor
forms of this rare species.
a
Figure 40. Atlantic Wentletraps. a, Cirsotrema dalli Rehder, i^ inches; b,
A?mea mitchelli Dall, 2 inches (Texas); c, Sthetiorytis pernobilis Fischer and
Bernardi, i inch; d, Ajmea retifera Dall, i inch; e, Epitonium krebsi Morch,
% inch.
Cirsotrema dalli Rehder
Genus Cirsotrema Morch 1852
North Carolina to southeast Florida and to Brazil.
Dall's Wentletrap
Plate 22c; figure 40a