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 



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. 



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. 



Genus Cirsotrema Morch 1852 

 Cirsotrema dalli Rehder 



North Carolina to southeast Florida and to Brazil. 



Dall's Wentletrap 



Plate 22c; figure 40a 



