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 

 subangular periphery upon which are indications of irregulari- 

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

 peripheral keel. Conrad 1 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, 2 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 3 says that P. elevata and P. perlata "will un- 

 doubtedly prove to be the same as P. richardsonii 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 (101); Navesink marl, Atlantic Highlands (108). 



Geographic distribution. New Jersey, Alabama, Georgia, 

 Mississippi. 



Pyropsis pyruloidea (Gabb). 

 Plate LXXXVL, Figs. 6-7. 



1860. Rapa pyruloidea Gabb, Proc. Acad. Nat. Sci. Phil. 



(1860), p. 94, pi. 2, fig. 4. 



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



13 (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. 



1 Am. Jour. Conch., vol. 4, p. 248. 



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



3 Proc. Acad. Nat. Sci. Phil. (1905), P- 23. 



