TRANSACTIONS OF WAGNER 

 TERTIARY FAUNA OF FLORIDA 



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

 and belongs to the genus Led a (q. .'.). Yoldia Cooperi Gabb, a fine species, 

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

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

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

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

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

 from the Oregon Tertiary. Y. nasnta and oi'alis Gabb were described from 

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

 from our own country is Y. Kindlci Harr., from the Midway Eocene of Ten- 

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

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

 clongatoidca 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. claibonicnsis Conrad ; from the Oligoccne of the Antilles Y. Crosbyana 

 Guppy; Y. serica Conrad is a good species from Reel Bluff; and Shell Bluff, 

 Georgia, and the Floridian Chipola beds have a species apiece. Y. cor/'i/- 

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

 genus Leda. 



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 Holier, ]S.j2. 



Two species were referred by Mollcr 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 ]". thracitzformis Storer (= Y. angidaris 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. kyperb&rca Torell, and by others with K glacialis 

 Wood (+ Y. tmncata Brown, -|- )" portlandica Hitchcock). From Moller's 

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



