1895.] NATURAL, SCIENCES OF PHILADELPHIA. 447 



for 1871. The number of species determined at that time was 

 thirty- four. 



The specimens now received were derived from another part of the 

 same fissure, which had been exposed by further excavations by the 

 quarrymen. The first to come to hand were obtained by Dr. Dixon 

 and Mr. S. N. Rhoads, but subsequently a large amount of 

 material had been taken from the deposit by Mr. H. C. Mercer, who 

 had carefully uoted the position of every specimen. The observations 

 now made by Prof. Cope were based on not more than half the 

 material obtained, and could be regarded as only preliminary to a full 

 report which he hoped to make at a future time. 



The species obtained so far, including those of the collection of 

 1870, are as follows: Batraehia, undetermined, one sp., Testudinata, 

 three species; Ophidia, two species; Aves, two species; Mammalia, 

 Edentata, five species; Glires, twelve species; Inset ■tivora, one species; 

 Camivora, fourteen species; Proboscidia, one species; Diplarthra, 

 seven species; total, forty-eight species. Subtracting three species from 

 the list of 1871 as not well founded, we have an addition of seventeen 

 species made by the present exploration. Of these additions ten 

 species are Camivora. 



Characteristic peculiarities of the association of species are the 

 following: The most abundant of the large mammals is the tapir, 

 Tapirus haysii Leidy. The next most abundant is the bear, Arcto- 

 therium pristinum Leidy. Probably the skunk, Mephitis mephitica 

 L. is the next most numerously represented. If we regard the sloths 

 of the genus Megalonyx as representing one species, they are the most 

 numerous in individuals, but there are several species. Equus 

 major Dek. and Mastodon amerieanus Cuv., in both young and adult 

 individuals, are not rare. The remains of Elephas have not been 

 found, and the first collection only contains Mylodon. Peccaries of 

 two species are not uncommon; while a few individuals of a deer 

 occur, and a single tooth of a rather large cameloid. The Glires of 

 the new collection had not been investigated, but there is a left ramus 

 mandibuli of a beaver which' is very near to, if not identical with, 

 the Castor fiber, a species not contained in the collection of 1870. 

 No fragments of opossum have been found, and raccoon is very rare. 



More attention has been given to the Camivora of the collection. 

 The Arctotherium pristinum is of South American type, and is 

 widely different from the existing North American bears. Associated 

 with it are remains not distinguishable from the common black bear, 

 Ursus amerieanus. A few teeth and bones are not distinguishable 

 from those of the wolf, while two species of foxes are represented by 

 two molar teeth, one of which is not distinguishable from the corres- 

 ponding part of the gray fox, V. einereoargentatus. Fragments of 

 sectorials are closely similar to those of Eassariscus astutus, and 

 fragments represent a weasel, Mustela. The cats are represented 



