TRANSACTIONS OF WAGNER 

 594 



^^ TERTIARY FAUNA OF FLORIDA 



albaria Conrad, from the New Jersey marls, was originally named protcxta, 

 and belongs to the genus Lcda {q. v.). Yoldia Cooperi Gabb, a fine species, 

 erroneously referred afterwards to Y. hnpressa Conrad, is found recent and in 

 the later Tertiaries of California. Y. hnpressa Conrad was described from the 

 Eocene of Oregon. Y. lavis Say, which has been confused with its probable 

 descendant Y. Ihnatida Say, is abundant in the Miocene of the eastern United 

 States. Y. abntpta Conrad (1848, not of Dana, 1847) is an obscure species 

 from the Oregon Tertiary. Y. nasuta and ovalis Gabb were described from 

 the Oligocene of St. Domingo. The earliest Tertiary species I have noted 

 from our own country is Y. Kindlei Ham, from the Midway Eocene of Ten- 

 nessee. Yoldia cboi'ca (Conrad) Harris is a Lcda, but judging from the figure 

 (Bull. Amer. Pal., iv., pi. 4, fig. 10), the species doubtfully referred to Lcda 

 cloiigatoidca Aldr. by Professor Harris, and which he has since named Yoldia 

 Aldrichiana, belongs to the genus Yoldia. From the Claibornian we have the 

 rare Y. claiboruensis Conrad; from the Oligocene of the Antilles Y. Ci-osbyana 

 Guppy ; K i'tvvVrt: Conrad is a good species from Red Bluff; and Shell Bluff, 

 Georgia, and the Floridian Chipola beds have a species apiece. Y. corpii- 

 Icntoidca Aldr., with chorea Conrad and similar forms, are better placed in the 

 genus Lcda. 



This genus has been variously subdivided, especially in Professor Verrill's 

 paper above alluded to, but a conservative view, taking into account the 

 variable characters exhibited by the respective species and the indubitably 

 close relations with Leda, obliges me to withhold from the most marked of 

 the several groups a more than sectional value, and to regard a large pro- 

 portion of the names as synonymes. The following arrangement, based on 

 the above considerations, may, perhaps, be accepted. 



Genus YOLDIA Moller, 1S42. 

 Two species were referred by Moller to his new genus, one of which was, 

 according to Morch, Y. glacialis Wood (=K " arctica Gray," Moller), and the 

 other a young specimen of Y. thracicsformis Storer (= Y. augidaris Moller). 

 The original Nucida arctica Gray is indeterminable from-the brief diagnosis, 

 and was not figured. It has been identified by several naturalists (Hanley, 

 Smith, and others) with Y. hypcrborca Torell, and by others with 3' glacialis 

 Wood (+ Y. truncaia Brown, + Y. portlaiidica Hitchcock). From Moller's 

 description of his Y. arctica as " planiuscula, Isevi, nitida, luteo-vel fusco 



