EXPLANATION OF PLATE XXXI. 



VOLUTA PARVULA WMtf. (p. 208). 



i'lGs. 1, 2. Two views of a very broad specimen. 



3. View of ii narrower specimen. 



4. TUe outer half of the last volution removed to show the coluraellar folds. 



5. View of a specimen doubtfully referred to this species, and showing a mammillated apex. 



Am. Mus. Nat. Hist. 



VOLTTTA SCAPH0IDE8 Whitf. (p. 209). 



6-8. Three views of a cast of this species, Fig. 6 having a part removed to show the colu- 



mellar folds. Am. Mus. Nat. Hist. 

 360 



