EXPLANATION OF PLATE IV. 
PYRIFUSUS SUBDENSATUS Conrad (p. 48). 
1-3. Front, back, and summit views of Conrad’s type of the genus. Am. Mus. Nat. Hist. 
PyrIFUSUS ERRATICUS Whitf. (p. 50). 
4. View of the shell as obtained by gutta-percha from the matrix. 
5, An enlargement of the surface striw. Columbia College. 
Pyrirusus MEEKI Whitf. (p. 55). 
6. View of an imperfect cast from Crosswicks Creek. Columbia College. 
7,8. Views of a more perfect cast from the same locality. State collection. 
PYRIFUSUS CUNEUS Whiftf. (p. 51). 
9. View of a small cast from the collection Acad, Nat. Sci., Phila. 
10,11. Two views of a larger cast from Freehold, New Jersey. 
PYRIFUSUS PYRULOIDES Gabb (p. 53). 
12,13. Two views of the type specimen. Acad. Nat. Sci., Phila. 
Pyrirusus McFarLanpi Whitf. (p. 52). 
14,15. Two views of the type. Mullica Hill, New Jersey. 
Pyrirusus MULLICAENSIS Gabb (p.52). 
16,17. Two views of the smaller cast, from Freehold, New Jersey. 
18,19. Similar views of a larger cast, from Mullica Hill, New Jersey. 
NEPTUNELLA MULLICAENSIS Whitf. (p. 56). 
20,21. Two views of aspecimen from Mullica Hill, New Jersey. Collection Acad. Nat. Sci., Phila. 
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