TRANSACTIONS OF WAGNER 

 1226 



TERTIARY FAUNA OF FLORIDA 



Cyprina, while the Californian form, D. alta, is still too little known for exact 

 determination. 



Except in the number of cardinals and the presence of a sinus Dosiniopsis 

 is conchologically a Cyprina, but the above characters indicate its proper place 

 to be in this family. 



Subgenus AEORA Conrad. 



Mora Conrad, Am. Journ. Conch., vi., p. 72, 1870 (type JEora cretacea Conrad, Cretaceous 

 of New Jersey) ; Whitfield, Brach. Lam. Raritan Clays, p. 168, pi. xxiii., figs. 16, 17, 

 1885. 



This species and genus is still known only by Conrad's type. So far as I 

 am able to discover, it does not differ in its characters from Dosiniopsis, except 

 as a smaller, more delicate, and more elongated shell might differ from a heavy 

 and orbicular one. The presence or absence of the right posterior lateral is not 

 yet determined, but the excavation of the left hinge-plate leads to the proba- 

 bility that there is a tooth to occupy it. Professor Whitfield was mistaken in 

 supposing that Stoliczka referred this group to the Tellinida. In reality, he 

 placed it next to Thetironia among the precursors of the Veneridce. 



Subgenus PELECYORA Dall, 1902. 



Type Cytherea hatchetigbeensis Aldrich, from the upper Chickasawan Eocene of Hatchet- 

 igbee Bluff, Alabama. See Harris, Bull. Am. Paleont., ii., pi. x^iij., figs. II, 12. 



O- 



Shell orbicular, with rugose nymphs, simple anterior lateral and socket ; no 



posterior lateral; the pallial sinus narrow, angular, ascending, rather long; 

 otherwise as in Dosiniopsis. The right posterior cardinal is bifid, the others 

 entire. 



This group differs from Dosiniopsis in its smooth lateral and socket, ab- 

 sence of the posterior lateral, and relatively deeper pallial sinus. The same 

 characters, as well as its orbicular form and entire left cardinals, distinguish it 

 from &ora as described. 



B. An anterior left lateral tooth present, the luniile distinctly limited by an 



incised line. 



Genus DOSINIA Scopoli. 

 Dosinia Scopoli, Introd. ad Hist. Nat, p. 399, 1777. Type Le Dosin Adanson, Dosinia 



africana Hanley. 

 Cytherea (sp.) Bolten, Mus. Boltenianum, p. 177, 1798; ed. ii., p. 124, 1819; Lamarck, 



