EXPLANATION OF PLATE XXXII. 



VOLUTA Nkwcombiana Wliitf. (p. 211). 



Figs. 1,2. Two views of a specimen of the ordinary form. 



3. View of a shorter spired form sho'wing cavities of the columellar folds. These are from 

 the collection Am. Mus. Nat. Hist. 



VoLUTA. Vesta Whitf. (p. 210). 



4, 5. Two views of an imperfect cast. 



6. Represents the lower part of specimen shown by the faint line on Fig. 4, removed to show 

 th e folds on its lower surface. Am. Mus. Nat. Hist. 

 362 



