EXPLANATION OF PLATE IV. 



Pyrifusus subdensatus Conrad (p. 48). 



1-3. Front, back, and summit views of Conrad's type of the genus. Am. Mns. 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 strise. Columbia College. 



Pyrifusus Mbbki Whitf. (p. 55). 



6. View of an imperfect cast from Croaswicks Creek. Columbia College. 

 7, 8. Views of a more perfect cast from the same locality. State collection. 



Pyrifusus cuneus Whitf. (p. 51). 



9. View of a small cast from the collection Acad. Nat. Soi., 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. 



Pyrifusus McFarlandi Whitf. (p. 52). 

 14, 15. Two views of the type. MuUica Hill, New Jersey. 



Pyrifusus Mullicaensis Gabb (p. 52). 



16, 17. Two views of tbe 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 a specimen from Mullica Hill, New Jersey. Collection Acad. Nat. Sci., Phila. 

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