32 Cincinnati Society of Natural History. 
where, especially in localities where, as on the Ottawa, the debris of 
land-plants and land-shells occur in the marine deposits. 
The Eocene of New Jersey* is known as the Upper marl bed, and 
has a thickness of 37 feet. Fossils are abundant wherever marl pits 
have been opened, between Deal on the sea shore and Clementon in 
Camden county. 
The Miocene is recognized by its fossils in many localities in New 
Jersey. It is not always conformable with the Eocene below, and its 
thickness is variable. 
In 1868, Prof. E. D. Cope} described the Miocene deposit of the 
western shore of Maryland, as consisting of a dark, sandy clay, vary- 
ing from a leaden to a blackish color, through which water does not 
penetrate. Its upper horizon may be traced along the high shores and 
cliffs of the Chesapeake by the line of trickling springs’ which follow 
its upper surface. A great bed of shells occurs at from fourteen to 
twenty-two feet below its upper horizon. 
He described, Cetophis heteroclitus, Ixacanthus celospondylus, Pris- 
codelphinus spinosus, now Belosphys spinosus, P. atropius, now B. 
atropius, P. stenus, now B. stenus, Zarhachis flagellator, Delphin- 
apterus ruschenbergert, now Tretosphys ruschenbergert, D. lacertosus, 
now 7’. lacertosus, D. gabbi, now T. gabbi, D. hawkinsi, now T. hawkinst, 
D, tyrannus, now LEschrictius tyrannus, E. pusillus, Megaptera 
expansa, now H. expansus; from the Eocene green sand of Monmouth 
county, New Jersey, Paleophis halidanus, and P. littoralis. 
Isaac Lea described, from a Miocene deposit, six miles northeast of 
Camden, New Jersey, Unio alatoides, U. carriosoides, U. humerosot- 
des, U. nasutoides, U.radiatoides, U. subrotundoides, U. roanokoides, 
U. ligamentinoides, U. grandioides, and U. corpulentoides. 
Dr. Joseph Leidy described, from blue clay and sand beneath a bed 
of bitumen of Pliocene age, in Hardin.county, Texas, Megalonyx vali- 
dus, Trucifelis fatalis, and Emys petrolec; from Douglas Flat, Calav- 
eras county, California, Hlotherium superbum; from Martinez, #quus 
pacificus, the largest known fossil horse tooth; from Ashley river, 
South Carolina, Hoplocetus obesus; from Gibson county, Indiana, Di- 
cotyles nasutus, found when digging a well between 30 and 40 feet be- 
low the surface: from the Miocene of the Bad Lands of White river, 
Dakota, Leptictis haydeni, Ictops dakotensis; from Half-mvon Bay 
* Geo. of N. Jersey, 1868. 
} Proc. Acad. Nat. Sci. 
