9-11. 
12, 13. 
14, 15. 
16, 17. 
18, 19. 
20. 
332 
EXPLANATION OF PLATE XVII. 
MARGARITA ABYSSINA Gabb (p. 133). 
. Lateral and basal views of a specimen from Burlington, New Jersey. Am. Mus. Nat. Hist. 
New York City. 
. Enlargement to two diameters of the same. 
. Lateral and summit views of a cast from Crosswicks. 
MODULUS LAPIDOSUS Whitf. (p. 152). 
. Lateral, basal, and summit views of a very perfect cast. 
DELPHINULA LAPIDOSA Morton’s sp. (p. 152). 
Enlarged lateral, summit, and basal views of Dr. Morton’s type, from Alabama. Acad. 
Nat. Sci., Phila. 
MARGARITELLA ABBOTTI Gabb (p. 134). 
Summit and basal views of Mr. Gabb’s type. Acad. Nat. Sci., Phila. 
Lateral and summit views of another cast. Acad. Nat. Sci., Phila. 
XENOPHORA LEPROSA Morton (p. 135). 
Summit and basal views of a small cast. 
Basal and lateral views of a large cast from Crosswicks, New Jérsey. 
ENDOPTYGMA UMBILICATA Tuomey (p. 136). 
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. 
