EXPLANATION OF PLATE XVII. 



Margarita abtssina Gabb (p. 133). 



Figs. 1,2. Lateral and basal views of a specimen from Barlingtoo, New Jersey. Am. Mus. Nat. Hist. 

 New York City. 

 3. Eulargeraeut to two diameters of the same. 

 4,5. Lateral and summit views of a cast from Croaswicks. 



Modulus lapidosus Whitf. (p. 152). 

 6-8. Lateral, basal, and summit views of a very perfect cast. 



Delphinula I.APIDOSA Morton's sp. (p. 152). 



9-11. Enlarged lateral, summit, and basal views of Dr. Morton's type, from Alabama. Acad. 

 Nat. Sci., Phila. 



Margaritella Abbotti Gabb (p. 134). 



12, 13. Summit and basal views of Mf. Gabb's type. Acad. Nat. Sei., Phila. 

 14, 15. Lateral and summit views of another oast. Acad. Nat. Sci., Phila. 



Xenophora leprosa Morton (p. 135). 



16, 17. Summit and basal views of a small cast. 



18, 19. Basal and lateral views of a large cast from Crosswioks, New Jersey. 



Endoptygma umbilicata Tuomey (p. 136). 



20. Basal view of a small cast showing the groove left by the spiral tooth. Am. Mus. Nat. 



Hist., New York City. The specimen is from Burlington, New Jersey. 

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