306 NATURAL HISTORY BULLETIN. 



belis atro.v, Leidy. Tapirus Haysii, Leidy. 



Ursus Americanus, foss. Equus Americanus, Leidy. 



Ursus amplidens, Leidy. Bootherium cavifrons, Leidy. 



Megalonyx Jeffersonii, Harlan. Cervus Vtrginianus, foss. 



Megalonyx dissimilis, Leidy. Bison latifrons, Leidy. 



Mylodon Harlan i, Owen. Elephas primigenins. 



Ereptodon priscus, Leidy. Mastodo?i giganteus. 

 Tapirus Americanus, foss. 



Of these the last named is by far the most common. . . . • 

 They are found about twenty feet below the surface, and the 

 bones of other animals are associated with them." 



A comparison of the two citations shows that the two lists 

 are practically the same. The "solid blue clay" is in all prob- 

 ability not loess. The writer found no trace of these mam- 

 mals in the loess at Natchez, though molluscan remains were 

 abundant. But even if it proves that these mammals are 

 found in true loess, the problem herein discussed will not be 

 affected, as they are terrestrial and, if in true loess, only in its 

 lowest, or oldest, parts. 



The characteristic fossils of the loess at Natchez, as else- 

 where, are land snails. They are found in all fossiliferous 

 loess-exposures north and south, and the writer at least, has 

 failed to find any other fossils in undoubted loess in the south. 

 These fossils have already received some attention. Lyell's 

 references to them have already been quoted. Wailest gives 

 the first specific list J of species from the southern loess, identi- 

 fied wholly or in part by Conrad. They were obtained from 

 the "bluff formation," or loess, of Mississippi, and most of 

 them were probably from Natchez. They are: 

 Helix albolabris Helix perspectiva 



Helix alternala Helix profunda 



Helix concava Helix fhyroides 



Helix elevata Helix tridentata 



Helix fraterna 



To this list Hilgard adds Helix monodon and "a large 

 Achat in a found in Wilkinson county." Of these species H % 



tP. 283, 1. c. , also quoted in Hilgard, 1. c. , p. 196. 

 + Thisis an error. See Dr. A. Binney's list in additional notes at 

 the close of this paper. 

 §P. 195, 1. e. 



