742 CRETACEOUS PALEONTOLOGY. 



perlata. The cast itself shows the very flat spire, flatter than 

 any other member of the genus in the New Jersey faunas, and a 

 subangfular periphery upon which are indications of irregulari- 

 ties which in the shell itself are tubercle-like processes of the 

 peripheral keel. Conrad^ has expressed the opinion that Rapa 

 elevata is identical with Pyropsis perlata Con., and that both 

 may be the same as P. richardsoni Tuomey. Gabb,^ however, 

 says that R. elevata certainly is not the same as P. richardsoni, 

 although he thinks that P. richardsoni and P. perlata are the 

 same. Johnson* says that P. elevata and P. perlata "will un- 

 doubtedly prove to be the same as P. richardsomi Tuomey." 

 Whitfield has considered all three of the species as distinct forms. 

 An examination of the type of P. elevata shows that it is certainly 

 identical with P. richardsoni and P perlata, as has been previ- 

 ously suggested by Conrad and Johnson; the lithologic charac- 

 ters of the specimen also' indicates that it is from the Merchant- 

 ville clay-marl. 



Formation and locality. — Merchantville clay-marl, near Mat- 

 awan (loi) ; Navesink marl, Atlantic Highlands (io8). 



Geographic distribution. — New Jersey, Alabama, Georgia, 

 Mississippi. 



Pyropsis pyruloidea (Gabb). 



Plate LXXXVI, Figs. 6-7. 



i860. Rapa pyruloidea Gabb, Proc. Acad. Nat. Sci. Phil. 



(i860), p. 94, pi. 2, fig. 4. 

 1861. Rapa pyruloidea Gabb, Synop. Moll. Cret. Form., p. 



130 (74)- 

 1864. Rapa pyruloidea Meek, Check List Inv. Foss. N. A., 



Cret. and Jur., p. 21. 

 1868. Rapa pyruloidea ? Con., Cook's Geol. N. J., p. 730. 

 1892. Pyrifusus pyruloides Whitf., Pal. N. J., vol. 2 (Monog. 



U. S. G. S., vol. 18), p. 53, pi. 4, figs. 12-13. 



'■ Am. Jour. Conch., vol. 4, p. 248. 



'Proc. Acad. Nat. Sci. Phil. (1876)), p. 284. 



'Proc. Acad. Nat. Sci. Phil. (1905), p. 23. 



