440 THE ANATOMY OF VEBTEBEATED ANIMALS. 



of tlie tendons for the third, fourth, and fifth digits. The 

 flexor subliniis, or perforatus, for digits ii.. Hi., and iv. arises 

 from the inner condyle as usual; but that for the fifth digit 

 springs from the pisiform bone — thus simulating the or- 

 dinary arrangement of the pei-forated flexor in the pes. 

 There is no pronator quadratus; but the palmaris longus 

 is distinct, and its slender tendon expands into the palmar 

 aponeurosis. Each digit, except the poUex, has a pair of 

 flexores hreves, or interossei, which lie on the palmar faces of 

 the metacarpal bones. 



In the hind limb, the salens has only a fibular origin. The 

 plantaris is very large and ensheathed in the gastrocnemius ; 

 it ends in a tendon nearly as large as the tendo Achillis, 

 wli|ich passes over the end of the calcaneum, being con- 

 nected with this and the tendo Achillis by a strong fascia 

 laterally, but being, otherwise, separated from it by a 

 synovial sac. In the sole of the foot it divides into four 

 tendons, which become the perforated tendons of the 

 four digits. The flexor perforans and flexor hallucis are 

 fused into one muscle, the tendon of which divides in 

 the sole into the four perforating tendons. There are 

 three lumbricales, and four pair of interossei {flexores breves). 

 There is no proper tibialis posticus, but a muscle arises 

 from the upper part of the inner face of the tibia, internal 

 to, and in front of, the insertion of the poplitceus, becomes 

 tendinous about the middle of the leg, passes behind the 

 inner malleolus, and runs along the inner and dorsal aspect 

 of the second metatarsal to be inserted into the extensor 

 tendons. It seems to stand in the same relation to the 

 second digit as the peronoeus quinti, on the opposite side of 

 the pes, to the fifth digit. The peronceus longus is inserted 

 into the base of the second metatarsal : a peronceus brevis, 

 p. quarti, and p. quinti digiti are present. There is no 

 extensor hallucis longus, nor any extensor brevis digitorum. 



The principal characters of the brain of the Rabbit have 

 already been described (see p. 64, and Figs. 21 and 22). 

 There is a single large corpus mammillare. Of the corpora 

 quadrigemina, the nates are larger than the testes. There 



