HATCHER : OLIGOCENE CANID^ 89 



posterior external border throughout one half the length of the bone. On the pos- 

 tero-internal margin, just at the base of the neck, there is a conspicuous lesser 

 trochanter. There is no third trochanter. Distally the internal and external con- 

 dyles are subequal and separated by a deep but narrow intercondylar notch. There 

 were present on the external condyles rather prominent fabellse. The external and 

 internal tuberosities are not prominent and in the middle of the latter there is a deep 

 ligamentary depression, equaling that for the ligamentum teres. . The trochlea for 

 the patella is broad and shallow as in the cats. 



The Patella. — PI. XIX., Fig. 13. This bone is decidedly feline in character. Its 

 general form is that of an almond, thickened above and wedge-shaped inferiorly. 

 The articular surfase is broadly convex transversely and very gently concave ver- 

 tically. 



Ihe Cms. — The crus is in almost every respect more feline than canine in char- 

 acter. This is shown in the length of the bones composing it, which are not only 

 absolutely longer than those of the fore arm, but are proportionately longer when the 

 length of these bones is compared with that of the humerus and femur. But it is 

 in the shape of the fibula and in its relation to the tibia that the most characteristic 

 feline characters are to be found, as will readily appear when we come to describe 

 that bone in detail. 



The Tibia. — PI. XIX., Figs. 3 and 4. The tibia is a little more than one fourth 

 longer than the radius. Proximally it is much expanded both laterally and antero- 

 posteriorly. The surfaces for articulation with the external and internal condyles of 

 the femur are subequal and separated from one another by a rather high median 

 crest. The cnemial ridge is high and long, extending far down on the anterior 

 border, as in the cats, instead of being short as in the dogs. There is a broad articu- 

 lar area on the inferior and outer surface of the external tuberosity for articulation 

 with the fibula. The external and internal tuberosities are much projected poste- 

 riorly in such manner as to overhang the shaft of the bone to a much greater degree 

 than that which obtains in the dogs and more nearly resembling those conditions 

 as displayed in the cats. Throughout the proximal two thirds of its length the 

 shaft of the tibia is trihedral in cross-section, distally, however, it is irregularly quad- 

 rangular. Throughout one half of its length at the distal extremity the external 

 surface of the tibia is produced into a low sharp ridge, as in the cats, instead of 

 being flattened for contact with the fibula, as in the dogs. In harmony with the 

 above mentioned characters the shafts of the tibia and fibula are widely separated 

 in Daphwnus throughout their entire length as in the cats, instead of being closely 

 applied throughout the lower one half of their length as in the dogs. Tiie distal 



