Mesozoic and Cenozoic Geology and Paleontology. 35 
preservation. The stump stratum exists, at about the same level, over 
all the Delta plain of the Mississippi and along the Gulf coast from 
Mobile, on the east, to the Sabine river. 
Dr. Joseph Leidy* described, from the White River Group of Dakota, 
Oreodon affinis, O. bullatus, O. hybridus, Leptauchenia nitida, Homo- 
camelus caninus, Cosoryx furcatus, Nanohyus porcinus, Protohippus 
placidus, Hipparion affine, and H. gratum, He described from the 
Eocene near Fort Bridger, Wyoming,t Omomys carteri, Trionyx 
guitatus, Emys wyomingensis, and from South Bitter creek, near 
where it crosses the stage route, 70 miles west of the summit of 
the Rocky mountains, in western Wyoming, Crocodilus aptus. 
Prof. E. D. Copet described, from the Miocene of Shiloh, Cumber- 
land county, New Jersey, Zretosphys ureus, Zarhachis velox, and 
Trionyx lima; from the mouth of the Patuxent river, Maryland, 
Zarhachis tysont. 
He described,§ from the Eocene marl pits, at Shark river, Monmouth 
county, N. J., Hemicaulodon effodiens; from Farmingdale, Myliobates 
glottoides, and Celorhynchus acus; from the Green River Group, on 
the upper waters of Green river, Wyoming, Asineops squamifrons, 
Clupea pusilla, Cyprinodon levatus; from the Miocene in Wayne 
county, North Carolina, Pnewmatosteus nahunticus; from Duplin 
county, Pristis attenuatus; from Edgecombe county, Hschrichtius 
polyporus; from Quanky creek, Halifax county, Mesoteras kerranus; 
from Stafford county, Va., Thinotherium annulatum. 
He described, from the Post-pliocene, at Savannah, Georgia, Anoplo- 
nassa forcipata; from cave Breccia, in Wythe county, Virginia, Zamias 
levidens, Sciurus panolius, and Galera perdicida. 
Prof. O. C. Marsh|| described, from the Eocene, near Shark river, 
Monmouth county, New Jersey, Dinophis grandis. 
T. A. Conrad described, from the same locality, Pecten kneiskerni, 
Crassatella littoralis, Crassina veta, Bucardia veta, Caryatis dela- 
warensis, Protocardia curta, Onustus annosus, and Terebratula glossa, 
And from the Miocene of St. Charles county, Maryland, and from 
Petersburg, Va., Pecten cerinus, Callista virginiana, Saxicava insita, 
Scapharca tenuicardo, Mercenaria plena, and Capsa parilis. 
* Jour. Acad. Nat. Sci., vol. vii. 
+ Proc. Acad. Nat. Sci. 
t Proc. Acad. Nat. Sci. 
2 Proc. Am. Phil. Soe., vol. xi. 
|| Am- Jour. Sci. & Arts, 2d series, vol. xlviii. 
7 Am. Jour. Conchology, vol. v. 
