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EXPLANATION OF PLATE 34 



Figure Page 



233b. Busycon "contrarium (Conrad)" 164 



Apertural view of aberrant form. 



233c. Busycon "contrarium (Conrad)" 164 



Rear view of aberrant form. 



233 D. Busycon perversuni (Linne) 164 



233 E. Busycon perversum (Linne) 164 



Collection Academy of Natural Sciences, Philadelphia, Pa. 

 The locality for this specimen is not known. 



