VERTEBRATE REMAINS, PORT KENNEDY BONE DEPOSIT. 247 



These specimens prove the existence with Smilodon gracilis, of a second species 

 of saber-tooth of smaller size, which in its two-rooted second premolar resembles the 

 species of Machcsrodus, a genus to which it may ultimately be found to belong when 

 the remaining parts of the skull and teeth are obtained. Smilodon mercerii was a 

 most formidable animal of the size of the jaguar, but with much more efficient 

 mechanism for blood-letting than the latter. Why the cats of this type disappeared, 

 while the Unciae remained, is as yet an unexplained problem. 



This species is dedicated to Mr. Henry C. Mercer of the Archaeological Museum 

 of the University of Pennsylvania, to whose personal exertions science is indebted 

 for the greater part of the material described in this paper. 



UNCIA Gray. 

 Proc. Zool. Soc. London, ]867, p. 263, Cope emend., Proc. Acad. Nat. Sci. Phil., 187!), p. 168. 



This genus is related to Felis much as Cam's is to Vulpes. As in the case of 

 Canis and Vulpes it differs from Felis in the round and not fissured form of the 

 pupil. It also differs from Felis in the considerably less complex turbinal bones, a 

 distinction which does not appear to hold in the case of Canis as compared with 

 Vulpes. The species of Uncia are of larger size than those of Felis in the existing 

 fauna, and they are more diurnal in their habits. So the species of Canis are larger 

 than those of Vulpes and are more diurnal, This genus includes the large cats of 

 both hemispheres. A well-marked species left its remains in the Port Kennedy 

 bone fissure. 



Uncia inexpectata Cope (PI. XXI, figs. 1-1/). [Type No. 52, Mus, Acad. Nat. Sci. Phil.] 

 Crocutainexpectata Cope, Proc. Acad. Nat. Sci. Phil , 1895, p. 148. 



This species was founded on a superior sectorial tooth of the right side. I 

 refer to the same species a large fragment of the right mandibular ramus containing 

 the sectorial and most of the first premolar, with which were found the crown of the 

 left inferior sectorial, left first premolar and three inferior incisor teeth. At 

 another locality part of another superior sectorial was found, and at still another an 

 entire superior canine. These specimens all belong to large species of Uncia, but 

 to individuals of two slightly different dimensions. It remains to be determined 

 Avhether these are referable to one species, but I suspect that such will prove to be 

 the case. There are also parts of two humeri, fifteen metapodials and ten phalanges, 

 which agree in size with this species, but which were found separately. The smaller 

 specimens equal the average size of the jaguar. 



The superior canine is less robust than that of the jaguar, and resembles in size 

 and form that of the puma. As the apex is broken off, a trace only of the external 

 groove remains. The crown is subcircular at the base, and the anterior internal 

 and posterior median ridges are distinct. 



The superior sectorial is remarkable for the small size of the protocone which 

 has been broken off, leaving slight trace of its former existence. The slope of the 

 adjacent surfaces is reconcilable with its presence, but small development. In this 

 respect the tooth differs from the corresponding teeth of the Uncias, and resemble 8 



