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Rh 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 Figure 40c North Carolina to southeast Florida and to Barbados. 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.

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. Genus Cirsotrema Morch 1852 Cirsotrema dalli Rehder North Carolina to southeast Florida and to Brazil. Dall's Wentletrap Plate 22c; figure 40a