The American 



[>!;,y, 



should therefore bear date, 1892. The author shows that Eohippus is 

 not as primitive a type as Systemodon, and that it is little, if at all, 

 distinct from Hyracotherium. Helohippus he does not distingu^ 

 from Pliolophus Owen (1841). "Orohippus" is not distinguished 

 from "Epihippus." He then fails to distinguish "Miohippus" from 

 the long known Anchitherium, and correctly describes the characters 

 of Protohippus as though he had discovered them, although they were 

 made known by others seventeen years ago. 



The article in the May number of the American Journal recites 

 that Professor Marsh has " discovered " a new order of Ungulata 

 which he calls the " Mesodactyla," which is established on a new 

 genus which he terms " Hyracops." This genus is defined with the 

 omission of essential details as to the structures of the upper and lower 

 molars. It is said to resemble Meniscotherium, differing only in that 

 the last premolars resemble the true molars. This definition is of very 

 doubtful value, since in Meniscotherium the last inferior true molar 

 is like a true molar, and the last deciduous superior molar, has the 

 same peculiarity, and persists, as Marsh observes, a long time. 1 Pro- 

 fessor Marsh gives us figures of the fore and hind feet of his specimen, 

 which are very welcome, as the structure of the former has been 

 hitherto unknown. These figures show that the reference of Menisco- 

 therium to the order Condylarthra made in 1885 is correct. As to 

 the name Mesodactyla, it will probably be adopted when the univer- 

 sally adopted Artiodactyla and Perissodactyla are put aside for the 

 names Professor Marsh so strangely desires us to use in their place. 

 The proposal of a new name is all the more remarkable since Professor 

 Marsh had already proposed a new name (as recited in the first article 

 here commented on) for the theoretical type which is actually repre- 

 sented in this foot structure, as anticipated by Cope in 1873, and 

 actually discovered in 1881. 2 In his discussion of the affinities of this 

 form, Marsh repeats well-known generalizations as new and especially 

 one made by myself, which has not found general acceptance, viz: 

 that this type (the Condylarthra) is ancestral to the Lemurine Quad- 

 rumana. This generalization is fully confirmed.— E. D. Cope. 



On the Correlation of Moraines with Raised Beaches 

 of Lake Erie.— During the field seasons of 1889, 1890 and 1891, 

 Mr. Frank Leverett made a series of observations of the raised beaches 

 fi 1 ^ C 1 h 8 « 5 SpeCilnen ' S re P resented h y C °pe in ^e Tertiary Mammalia. Fl. xx*i, 



'American Naturalist, 1881, p. 1017. 



