446 THE ANATOMY OF VEETEBRATED ANIMALS. 



In the myology of the limbs the following points are 

 noteworthy : The supinator longus, pronator teres and pal- 

 maris longus are absent. The palmaris brevis is present. A 

 single muscle takes the place of the extensor secundi internodii 

 poinds and extensor indicis, and sends a third tendon to the 

 middle digit. The extensor minimi digiti supphes the other 

 two digits. The flexor perforans and flexor pollicis longus are 

 represented by five distinct muse alar heads, each with a 

 tendon of its own ; but all the tendons unite in the middle 

 of the forearm, and the common tendon again subdivides 

 into only four slips, the poUex receiving no tendon. There 

 are no lumhricales. The pollex has only a rudimentary /ea;or 

 brevis and an abductor. The other digits have each two 

 interossei, or flexores breves, inserted into the metacarpo- 

 phalangeal sesamoids. 



In the leg, the soleus has only a fibular head, and the 

 flexor brevis digitorum arises wholly from the calcaneum. 

 The flexor hallucis and flexor perforans have a common 

 tendon, which, in the sole, divides into five tendons, one foi* 

 each digit. There ar eno luinbricales, nor flexor accessorius. 

 The tibialis posticus seems to be represented by two small 

 muscular bellies, one of which arises from the prominent 

 end of the tibia, and the other from that of the fibula. The 

 tendons of both pass behind the inner malleolus, and that 

 of the former muscle goes to the tibial and plantar siirface of 

 the hallucal metatarsal, while the latter is inserted into the 

 ento-cuneif orm bone. The interossei pedis are represented 

 by a pair oi flexores breves for each digit except the haUux. 



The adult Hedgehog has thirty-six teeth, of which twenty 

 are in the upper, and sixteen in the lower jaw. The dental 



o , . . 3-3 0—0 4—4 3-3 „„ 



formula is t. — c. — p.m. — m. — = 36. 



The grinding surface of the crowns of the first and second 

 upper molars exhibits a pattern fundamentally similar to 

 that of the coiTesponding teeth in Man, the Anthropo- 

 morpha, and' the majority of the Lemurs; that is to say, 

 there are four cusps, and the antero-internal is connected 

 with the postero- external cusp by an oblique ridge. The 



