EXPLANATION OF PLATE XV. 
Cypr=a (Aricia) Mortont Gabb (p. 120). 
Figs. 1-3. Three views of Mr. Gabb’s New Jersey type. Acad. Nat. Sci., Phila. 
Doxtum (DoLIopsiIs) MULTILIRATUM Whitf. (p. 121). 
4,5. Two views of the specimen used, natural size. 
6. Enlarged view of the same. 
FICUS PRECEDENS Whitf. (p. 122). 
7,8. Two views, enlarged two diameters, of the most perfect cast observed. 
NaTICA ABYSSINA Morton (p. 122). 
9,10. Two views, lateral and basal, of a cast from the white limestone nodules at Monimently 
New Jersey. ; 
11,12. Two similar views of another cast from the Green Marls. 
GYRODES INFRACARINATA Gabb (p. 125). 
13-15. Three views of a very characteristic cast from Highlands, New Jersey. 
16. Basal view ofa large cast from Burlington, New Jersey. 
GYRODES Apnorti Gabb, (p. 124). 
17. Summit view of the type specimen. Acad. Nat. Sci., Phila. 
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