55G MR. J. BESWICK-PERRIN ON THE [Julie 20, 



small and entirely fleshy muscle ; it joins the preceding. The con- 

 joined muscle is inserted by a very short and strong tendon into the 

 lesser trochanter of the femur. 



The sartorius arises from the upper third of the acetabular border 

 of the ilium. It is inserted into the inner side of the patella, and 

 into the shaft of the tibia immediately below the tuberosity. The 

 tendinous expansion at the knee-joint is united to the ligamentuni 

 patellae, and, stretching across the antero-lateral aspect of the joint, 

 forms a protective covering to it. 



The gracilis, three adductores, and peetineus present no peculiari- 

 ties, except that the former is a very extensive muscle, and the ad- 

 ductor magnus is entirely fleshy, the femoral artery passing through 

 a muscular canal and not a tendinous one as in the human subject. 



The rectus has only one tendon of origin. It is inserted into the 

 patella. The latter is not developed in the tendon of the rectus, 

 but rather in the tendon formed by the conjoined vasti and crureus. 

 There is no subcrureus ; the arrangement of the extensors of the leg 

 presents no other peculiarities. 



The semimembranosus arises from the ischial tuberosity by a flat 

 tendon half an inch wide. It is inserted into a depression on the 

 inner surface of the tibia, immediately below the tuberosity, passing 

 behind the internal lateral ligament. Its tendon of insertion is about 

 a quarter of an inch long, the rest of the muscle being fleshy. 



The semitendinosus arises by two portions — one from the trans- 

 verse processes of the third and fourth caudal vertebrae by a continuous 

 tendinous process, and the other from the tuber ischii. These two 

 heads unite about an inch and a quarter below their origin, forming 

 a large muscle which is inserted into the middle of the inner surface 

 of the shaft of the tibia. From the caudal origin, opposite its point 

 of junction with the ischial factor, a long slender muscle is given off, 

 which courses along the outer and posterior border of the gluteus 

 maximus muscle as far as the lower end of the femur, into which it 

 is inserted immediately above the external condyle. This is a very 

 peculiar muscle ; I have only once met with the homologue of this 

 slip in the human subject, a moderately muscular female at. nineteen. 

 It had not, however, the disposition as described in the Kinkajou. 

 It arose from the long factor of the biceps femoris, and joined the 

 semitendinosus immediately above the internal femoral condyle. 



The biceps femoris arises by two heads — one, the ischial, by a 

 pointed tendon from the tuberosity, the other from the transverse 

 process of the second caudal vertebra, immediately anterior to the 

 caudal factor of the semitendinosus. The former constitutes a broad, 

 expanded muscle, increasing in width as it passes downwards. It 

 terminates in a broad, expanded tendon, which is inserted into the 

 head of the fibula and into the fascia of the leg to the extent of an 

 inch and a quarter below this point ; the latter, or caudal factor of 

 the biceps, runs parallel with the preceding, and terminates along 

 with its lower fibres in the fascia of the leg, reaching as low down as 

 within an inch of the ankle-joint. 



There are no special peculiarities in the quadratus femoris, obtu- 



