1 



Two femora in the collection probably belong to this species, as they are creo- 

 dont in the presence of the third trochanter, and their dimensions are appropriate to the 

 lower jaw above described. One of them is larger than the other, and I give its dimen- 

 sions in comparison with those of two of the largest Carnivora, the grizzly bear and the 

 lion, in millimeters : — 



Hemipsalodon. Bear. Lion. 



Length 413 445 379 



Width at great trochanter 120 112 95 



" " little " 74 57 45 



" " third " or same position 63 40 35 



" " condyles 90 90 SI 



Depth at rotular ridges 98 73 77 



The third trochanter is low, much as in Protopsalis tigrinus, and has a thickened, 

 rough edge. It gives the shaft of the femora an external convexity, which is greater than 

 the gentle concavity of the internal border. The great trochanter projects to the horizon- 

 tal line of the head and not beyond. It is obliquely truncate externally, and narrowly at 

 the extremity. It encloses a deep trochanteric fossa posteriorly, through the strong recur- 

 vature of the posterior border. This border continues as a transverse convexity to the little 

 trochanter. The latter is a rounded prominent tuberosity, and has a superior position, as 

 in Carnivora generally, and is not placed low down on the shaft as in Protopsalis. The 

 shaft is flattened from before backwards, with the external edge angulated both above and 

 below the third trochanter. The rotular grove is remarkably elevated and rather narrowed, 

 giving the distal extremity of the femora the massive character of that of an ungulate 

 mammal. Borders of rotular groove subequally prominent, its surface continuous with 

 that of the condyles. Internal face of condyle with a pronounced fossa. Internal con- 

 dyle a little more prominent than the external. Intercondylar fossa broadly rounded 

 anteriorly. 



The deeper trochanteric fossa and more elevated positi on of the little trochanter dis- 

 tinguish these femora from that of Protopsalis tigrinus. It also considerably exceeds that of 

 the latter animal in dimensions. 



ANCYLOPODA. 

 CHALICOTHEPJUM, Kaup. 



Macrotherium, Lartet, teste Forsyth-Major and Filhol. 



The remarkable character of this genus, as discovered by Filhol, has been mentioned 

 in the American Naturalist. 2 It has little relation to the family of Perissodactyla to 

 which it has given the name, and which it so resembles in molar dentition. It must 

 form a family by itself, and the genera with which it has been associated must form a 

 family to which the name Lambdotheriidge has been applied. The anterior ungual pha- 

 langes of Chalicotherium are of prehensile character and not ungulate, but rather ungui- 

 culate. The phalanges resemble those of the Edentata, but the carpus and tarsus are 

 according to Filhol, diplarthrous in structure, while the Edentata are taxeopodous. "We 

 have in the Chalicotheriidae the antithesis of the Condylarthra. While the latter is 



1 Cope, American Naturalist, 1S89, p. 153 ; American Journal of Morphology, 1SS9, p. 142. 



2 Osborn on Chalicotherium, American Naturalist, 1888, p. 728. 



