EXPLANATION OP PLATE XIX. 



Obeuscus conellus Whitf. (p. 151). 



Figs. 1. View of the froat side of the specimen described, greatly ealargrtd. Acad. Nat. Sci. Phi la. 



Leiostkaca cretacea Conrad (p. 150). 



2-4. Views of three speoimeus showing the features described, enlarg d fonr, five, and three 

 diameters respectively. 

 5. A still further enlargement of the aperture from another shell. Acad. Nat. Sci. Phila. 



Hblcion ? TENTORIUM Morton (p. 153). 



6,7. Lateral and vertical views of the type, enlarged. Acad. Nat. Sol. Phila. 

 8. Further enlargement of the marginal strite. 



Action cretacea Gabb (p. 158). 



9, 10. Two views of a cast which shows no spiral striae. 

 11, 12. Two views of another cast showing spiral striae. Acad. Nat. Sci. Phila. 



AcTiEON Gabbana Whitf. (p. 156). 



13. Front view of one of Mr. Gabb's types of A. bipUoata. See Figs. 23-25. 



Action subovoides Whitf. (p. 155). 



14. Front view of the specimen marked " type of A. ovoides Gabb." 

 15, 16. Two views of a second specimen. Acad. Nat. Sci. Phila. 



Action Forbesiana Whitf. (p. 1.57). 



17, 18. Two views of a cast of the species. 



19, 20. Enlargements to two diameters of Fig. 17 and another specimen, showing the spiral lines. 



21,22. Two views of an individual from Mallica Hill. 



Action Gabbana Whitf. (p. 156). 



23-25. Further illustrations of this species to show the aperture, etc. 



Globiconcha corta Gabb (p. 160). 



26, 27. Front and lateral views of a cast of this species from Bell County, Texas. 



Cinulia (Oligoplychia) naticoides Gabb (p. 161). 



28. View of a specimen, natural size, from the collection at Columbia College. Monmouth 



County, New Jersey. 



29. Enlargement of the front of the same. 



30. View of another cast showing the cavity of the ridge. Crosswioks Creek, Now Jersey. ^ 

 336 



