464 THE ANATOMY OF VEETEBKATED ANIMALS. 



Platyrrliini, having one premolar more than tlie former and 

 one trne molar fewer than the latter. lu Hapale, the lower 

 incisors are proclivoxis ; and the canines are approximated 

 to them, and similarly inclined, as in the Lemurs. 



Although the manus is a paw and the poUes is not 

 opposable, this digit has its proper abductor, adductor, and 

 long and short flexors. The existence of a pi'oper opponens 

 of the poUex is doubtful, but there is an opponens minimi 

 digiti. Thefiexoi' longus is completely united with the flexor 

 profundus digitorum, but the tendon for the pollex comes 

 off on the radial side instead of on the ulnar side, as it does 

 in some of the higher Simiadce. The extensor secundi inter- 

 nodii 2^ollicis is united with the extensor indicis, and the 

 extensor minimi digiti gives off slips to the third, fourth, 

 and fifth digits, so that there is a complete set of deep ex- 

 tensors. The four dorsal and three palmar inter ossei are not 

 distinctly subdivided, but they send slips to the extensor 

 tendons. 



There are four peronczi : p. longus, p. hrevis, p. quarti, and 

 p. quinti digiti. The flexor hrevis digitorum of the pes has 

 one di\dsion which arises from the calcaneum and goes to 

 the second digit; the other three heads arise from the 

 tendons of the flexor perforans. The flexor accessorius fur- 

 nishes almost the whole of the long flexor tendons of the 

 hallux, the flexor longus digitorum supplying the perforating 

 tendons of the second and fifth digits ; while the flexor hal- 

 lucis longus gives off the corresponding tendons of the 

 third and fourth digits. The interossei, in the pes, appear 

 to be represented only by the pairs of miiacles which act 

 as short flexors of the basal phalanges, and these lie al- 

 together upon the plantar aspect of the five metatarsal 

 bones. The hallux has no special adductor, nor is there 

 any transversus pedis. In fact, the pes is almost as com- 

 pletely a " paw " as is the manus. 



The brain has long and relatively large cerebral hemi- 

 spheres, the postei'ior lobes of which project far beyond 

 the cerebellum, and thus completely hide it, in the upper 

 view of the bi-ain. The external surfaces of the hemi- 



