586 PHILOSOPHICAL TRANSACTIONS. [aNNO 17 10. 



fore, standing almost perpendicular with the two lower and utmost extremities 

 of the OS ilion, bending forward, having the os pubis ascending obliquely, 

 convex before, where joined together, and concave behind. This ascent of the 

 OS pubis is a further argument, that this is no retrocoient animal. 



The femur is 3 feet long with its upper epiphysis, in circumference 15 inches; 

 the neck below it is 13 inches; the breadth from the great trochanter on each 

 side 10 inches; below this trochanter, in circumference 18 inches; about the 

 middle 12 inches; round above the lower epiphysis l6 inches ; round the lower 

 epiphysis iiself, from the patella on the outside to its opposite part on the inside, 

 18-1- inches. Its diameter, where articulated with the tibia behind, is 7 inches; 

 having two protuberances, whereof the external is 2-^, and the internal 3-^ 

 inches. The internal epiphysis, which is received by the tibia, is from before 

 to behind 7 inches, and the external 5-^ inches. The femur is in general a 

 long straight bone, having a large round head, which in this subject is separated 

 from its body by a cartilage, still an argument of the youth of the animal, re- 

 ceived by the ossa innominata. A large trochanter on the outside, where the 

 bone is broadest: from thence in its descent it becomes smaller, flat before and 

 behind, and thicker on the inside than the outside, nearly of an equal size, till it 

 comes to the lower extremity, where it is increased into two large epiphyses, 

 which are received by the tibia, with a sinus in the middle, about 1 inch deep, 

 and as much diameter. It sends forth a large protuberance before, which is 

 received by the 



Rotula, or patella, a bone of a very rugous surface, considerably protuberant 

 on the outside, being from above to below 8 inches, and from the right to the 

 left 6 inches. It is articulated with the femur per ginglymum, having a cavity on 

 each side which receives, and a protuberance in the middle received by the femur. 



The tibia is in length, measuring behind, 22 inches; its circumference at 

 the upper epiphysis IQ inches, and at the neck 17 inches. Before it has a large 

 depression for facilitating the motion of the patella; of a very rugous surface, 

 for insertion of the extensores tibiae. It is almost semicircular before and flat 

 behind; its circumference about the middle is Q-y inches, and at the lower extre- 

 mity, where it again meets with the fibula, and where it receives the astragalus, 

 12 inches. 



The fibula is 21 inches long, 54^ inches round above, where received by the 

 tibia, 3 inches about the middle, and 5 inches at the lower part, where it 

 receives the tibia. Its epiphysis, which forms the external ancle, or malleolus, 

 measuring from before to behind along its outer surface, is 5^- inches. 



The bones of the hind foot consist of those of the tarsus, metatarsus, and 

 toes. The tarsus consists of 6 bones, whereof 



