TRANSACTIONS OF WAGNER 

 I2S6 



TERTIARY FAUNA OF FLORIDA 



Miocene of the artesian well at Atlantic City, New Jersey; of Maryland, 

 near Easton, on the Choptank River, on the Patuxent at Jones Wharf, at the 

 mouth of Parker's Creek, and three miles north of Plum Point Wharf, Calvert 

 County; from the marls near Skipton, and at Calvert Cliffs, Maryland. 



This is the largest and finest species in our Tertiary. The posterior right 

 cardinal is bifid and the edge of the fan-shaped anterior right cardinal in all 

 the specimens I have seen is transversely puckered or rugose, though I am not 

 sure that in this case this peculiarity may not be pathological. The pallial 

 sinus is short. 



Macrocallista (Chionella) maculata Linn^. 

 Venus maculata Linne, Systema Naturae, ed. x., p. 686, 1758; ed. xii., p. 1132, 1767. 

 Cytherea maculata Lamarck, An. s. Vert., v., p. 566, 1818 ; Sowerby, Conch. Man., fig. 



I-I7d, 1842; Thes. Conch., ii., p. 629, pi. cxxxi., fig. 97, 1851. 

 Chione maculata Gray, Analyst, viii., p. 306, 1838. 

 Dione maculata Deshayes, Cat. Conch. Brit. Mus., p. 57, 1853. 

 Callista maculata Morch, Cat. Yoldi, ii., p. 28, 1853 ; Gabb, Journ. Acad. Nat. Sci. Phila., 



2d Sen, viii., p. 344, 1881. 

 Meretrix dariena Conrad, App. Blake'.s Geol. Rep., H. Doc, 129, p. 18, 1855 ; not P. R. R. 



Rep., v., p. 328, pi. vi., fig. 55, 1856 (=^Clementia sp.). 

 Cytherea dariena Conrad, P. R. R. Rep., vi., p. 72, pi. v., fig. 21, 1857. 



Oligocene of the Chipola beds on the Chipola River and at Alum Bluff, 

 Chattahoochee River, Calhoun County, Florida ; of the Oak Grove sands at 

 Oak Grove, Santa Rosa County, Florida ; and at Shoal River, Walton County, 

 Florida ; Pliocene of the Caloosahatchie beds, on the Caloosahatchie, Shell 

 Creek, Alligator Creek, and of the Limon clays of Costa Rica ; recent from 

 Cape Hatteras, North Carolina, south to the West Indies and Cape San Roque, 

 Brazil, and west to Texas. 



This is one of the most elegant species of the group, and after careful study 

 I have been unable to find any constant characters which would serve to sepa- 

 rate the Oligocene from the recent shell. The Chipola specimens average 

 smaller than the recent ones, and the Costa Rica fossils are shorter in pro- 

 portion than the average of those now living, but both features may be acci- 

 dental and are paralleled by recent individuals examined. During the cold 

 Miocene epoch this species migrated to more congenial seas, but returned with 

 the milder Pliocene and has since remained on our coasts. Conrad named two 

 species Meretrix dariena, one of which is identified with this by Gabb, and I 



