THE DENTITION OF THE OyNOMORPHA. 401 



over the proximal ends of the metatarsal bones, and pass to 

 the three fibular digits. 



The interossei manus are very similar to those of Man, 

 being divided into a dorsal and a palmar set, and sending slips 

 to the extensor sheaths of the digits, without that complete 

 6ubdi\'ision v^hich is seen in the Anthropomorpha, 



There is a complete double set of extensors in the four 

 ulnar digits of the manus, the extensor minimi digiti giving 

 a tendon to the fourth digit, and the extensor indicis one to 

 the third digit. The extensor ossis metacarpi piollicis gives a 

 distinct slip to the trapezium, and thus precisely corresponds 

 ■with the tibialis anticus, which has two tendons, one for the 

 en to-cuneiform, and one for the metatarsal of the hallux. The 

 flexor digitorum profundus and flexor longus pollicis are rep- 

 resented by one muscle, a slip from the ulnar side of the ten- 

 don of vchich usually goes to the pollex. 



The tendons of the flexor perforans digitorum and flexor 

 hdllucis unite to form the deep flexor tendons of the pedal 

 digits in very variable proportions. The flexor acccssorius is 

 very generally present. 



The anterior upper premolar has its outer cusp peculiarly 

 modified and sharpened. The anterior lower premolar has 

 the anterior margin of its crown prolonged and cutting, so 

 that it works like as cissors-blade, against the posterior edge 

 of the upper canine. In the upper jaw, the premolars have 

 three roots ; in the lower two. The molars in both jaws have 

 four cusps connected by two transverse ridges. Sometimes 

 there is " heel " behind the posterior ridge of the last lower 

 molar. 



The formula of the milk dentition is d.i. ^ d.c. t.J d.m. 



^ = 20 ; and the anterior milk molar resembles the perma- 

 nent premolars, while the posterior is like a permanent molar. 



The permanent canines make their appearance before, or, 

 at latest, contemporaneously with, the hindermost molar in 

 both jaws. They are large and long, and are separated, by 

 a well-marked diastema, from the outer incisor above, and 

 Irom the first premolar below. 



The Cynomorpha very generally possess cheet-pouchea, 

 which serve as pockets for the temporary stowage of food. 

 The stomach is usually simple, with a globular cardiac ex- 

 tremity and an elongated pyloric portion ; but, in Semnopithe- 

 cus and Colobus, the stomach is divided into three compart- 

 ments, the middle of which is sacculated. A groove with 



