1895.] NATURAL SCIENCES OF PHILADELPHIA. 449 



angular process, but has no distinct apex; its base displays the origin 

 of a separate root. The inferior sectorial has no trace of heel. The 

 first premolar is short and robust, and has a short but well-defined 

 heel, and well-marked but not elevated posterior lobe. The principal 

 cusp is elevated and robust, with lenticular section with, outlines of 

 very unequal convexity. In a probable second specimen of this 

 tooth, the anterior lobe is distinct, acute edged, and little elevated. 

 Incisors short, hooked, and with basal lobe at one side only. 



The length of the fragment of the superior canine measures 111 

 mm.; anteroposterior diameter at base of crown 27 mm.; do. at 30 

 mm. from base 24 mm.; transverse diameter at do. 11 mm. Antero- 

 posterior diameter of superior sectorial 31 mm; greatest width (at 

 protocone) 14 mm. Anteroposterior diameter of inferior sectorial, 

 23 mm. ; do. of p. m. I, 20 mm. (restored). 



This species differs from the S. floridanus Liedy, in the much 

 greater compression of the superior canine tooth, while the general 

 dimensions are similar. 



Crocuta inexpectata sp. nov. This species is represented by a 

 right inferior sectorial in good preservation. It resembles a good 

 deal that of Crocuta maculata, and agrees with it in the absence 

 of trace of metaconid. The cutting heel is rather longer than in that 

 species, and the cingillum which is so conspicuous in it is wanting in 

 the fossil tooth. The paracouid and protoconid are well elevated 

 and equal. Anteroposterior diameter of crown 24 mm. ; do. of do. 

 exclusive of heel 19 mm.; elevation of paraconid 10 mm. 



The occurrence of a hyena in this collection is unlooked for, but was 

 rendered less incredible by the discovery of a species of this family, 

 Borophagus diversidens, in the pliocene bed of Texas. There is an 

 alternative to the identification of this species as Crocuta, and that is 

 that it might belong to the genus Nlmravus. As this genus belongs 

 to the middle Miocene, it is extremely improbable that it should 

 have a representative in the Pleistocene fauna, although the survival 

 of this form of sectorial tooth in connection with modern feline char- 

 acters in other respects is not an impossibility. 



Of the forty-eight species contained in the collection eleven have 

 not been finally determined. Of the thirty-six determined species 

 nine, or twenty-five per cent., are still existing, and the remain- 

 ing twenty-seven are extinct. Of the existing species eight are 

 nearctic, and one, Felis eyra, is neotropical. Of the extinct spe- 

 cies ten ai*e of nearctic type, and ten are of neotropical type; the 

 remaining six species being indifferently one or the other, except 

 the Crocuta, which is of old world type. The presence of Equiis 

 major, and of the beaver, connects the fauna directly with that of the 

 Equus beds of the West and Southwest, with which the Megalonyx 

 fauna, as he had called this one, was probably contemporaneous. 

 These faunas were separated by a long interval of time from the 



