EXPLANATION OF PLATE XXXI. 
VOLUTA PARVULA Whitf. (p. 208). 
Fics. 1,2. Two views of a very broad specimen. 
3. View of a narrower specimen. 
4. The outer half of the last volution removed to show the colamellar folds. 
5. View of a specimen donbtfully referred to this species, and showing a mammillated a 
Am, Mus. Nat. Hist. 
VoOLUTA SCAPHOIDES Whitf. (p. 209). 
6-8. Three views of a cast of this species, Fig. 6 haying a part removed to show the colu- 
mellar folds. Am. Mus. Nat, Hist. ae 
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