64 Bulletin g 256 



Locality. — Hatchetigbee Bluff, Ala., beneath the Buhrstone. 



" Prof. A. Heilprin considers this shell a C. discoidalis Con., 

 but that is described as having the inner margin crenulate, while 

 this is smooth." 



I think this can scarcely be placed under M. discoidalis Con. 

 Repub. Conrad's Foss. Sh., Tert. Form, pi. 20, fig. 2. It is 

 very common at Hatchetigbee but has not been noted else- 

 where. 



f Type. — Aldrich's colle(5tion. 



Specimen figured. — Hatchetigbee Bluff, Paleont. Museum, 

 Cornell University. 



Dosiniopsis lenticularis, PI. 12, fig. 13. 



Syn. Cytherea lenticularis Rogers, Trans. Amer. Philos. Soc, vol. vi, 

 .p. 372, pi. 28, fig. I, 1839. 

 Cytherea eversa Tuomey, 2d Biennial Rep't p. 271, 1858. 

 Dosiniopsis lenticularis AlA., Bull, i, Gaol. Surv. Ala., p. 57, 1886. 

 Dosiniopsis lentictdafis Har. , Anier. Jour. Sci. vol. 47, p. 302, 1894. 



Rogers'' original description!. — "Shell large, depressed, discoidal 

 rather thick, length nearly equal to the breadth ; trans- 

 versely striated ; lunule long, ovate, obscurely defined by a very 

 faint impressed line ; umbones rather depressed ; beaks small, 

 hardly recurved ; teeth straight, divergent ; cavity of the shell 

 not deep ; margin entire. Diameter about two inches. 



"Locality, eastern Virginia, in the Eocene, where it is a 

 common species. 



^'Remarks. — From the extreme friability of this shell it has been 

 impossible hitherto to procure a perfect specimen. It differs from 

 all the Cytherece of our American Eocene beds in its nearly or- 

 bicular form, and its slight degree of inflation. The insulated 

 tooth of the right valve is long, straight, and not much ele- 

 vated. The anterior cardinal tooth in the same valve is slight- 

 ly bifid. The striae upon the surface of the disc are almost 

 obsolete, where decay has not removed the external laminae. 

 The small incurvation in the beaks distinguishes it from C. 

 poulsoni of Conrad (C globosa La.), to which species it bears 

 some resemblance." 



Localities (Gulf slope). — Alabama: Bell's Landing. Georgia: 

 Ft. Gaines. 



Type. — 



Specimen figured. — Bell's Landing ; Harris' colledlion. 



