35 St. Maurice and CIvAiborne PeIvEcypoda 35 



collection are not perfect enough for further determinations. 

 Type. — I^eaColl., No. 5074, Phila. Acad. 



Creneila latifrons Conrad, PI. 17. Figs. 14, 15, 16. 



CrenellalatifronsQ.or\.,]r.'$)a:\\2.. Acad. Nat. Sci., vol. IV, i860, p. 



296. 



C? latifrons Con., Amer. Conch., vol. i, 1855, p. 11. 



Conrad^ s original description. — Obliquely sub-oval, inflated, thin, 

 highly pearlaceous ; anterior side produced or alated above ; striae very 

 closely arranged, elegant and minute, cancellate anteriorh^ 



Locality. — Alabama. Dr. Showalter. 



Otto Me5'er described (^Bericht iib. d. Senckenbergische nf. 

 Gesel. in Frankfurt a. M., i88'/,p. 10 sond.-Ab.) a Modiola teituis 

 and figured the same as fig. 7 and pi. 2 of his report, from the 

 Jackson Eocene. This, Dall maintains is the same as Conrad's 

 Creyiella latifrons. (See Trans. Wag., Ill, p. 798.) This is 

 quite possibly true. But Meyer strangely makes no reference to 

 the radiating lines so clearly defined in the Claibornian species. 

 We have several fragmentary specimens before us mostl57= from 

 the U. S. Nat. Mus. Claiborne sand material. Some we herewith 

 figure. 



Perhaps the most noteworthy feature of the species is the 

 broadl}^ out-folding anterior margin of the shell. 



The radiating strige are ver}^ much finer than in rnargaritacea 

 and do not show on the margins. 



Type. — Claiborne sands, Phila. Acad. 



Creneila rnargaritacea Conrad, PI. 17. Figs. 17-20. 



Sfalaginiiiiii viargaritaceiiin Con., Foss. Sh. Tert. Form, Oct., 1833, 



P- 39- 

 ?Jyoparo costata I^ea, Cont. to Geol., Dec. '33, p. 74, p. 74, pi. 2, iig. 51. 

 Stalagmiuni margaritaceum Con., Jour. Conch., 1865, p. 10. 

 Creneila costata de Greg., Faun. Eoc. Ala., 1890, p. 185, pi. 22, figs. 



8-14. 

 Creneila rnargaritacea Dall, Trans. Wag., Ill, '98, p. 803. 

 Conrad's original description. — Shell very small, ob-ovate, convex, 

 with distinct, radiating strise ; beaks prominent and curved forward ; lunule 

 short, cordate, slightl}' impressed ; inner margin minutely crenulated. 



Specimens of this minute valve are not rare at Claiborne, 

 but we have seen it from but one other locality — I^ee Co., Tex., 



