THE CHIMPANZEE AND ORANG UTAN. 373 
Intermawillary bones anchylosed to the maxillaries during the first or deciduous den- 
tition, 
Ex. The Chimpanzee, Black Orang, or Pygmy. (Troglodytes niger, Geoff. Simia Tro- 
glodytes, Blum.) Jocko, a name for the young Chimpanzee. 
Height of adult four feet. 
Hab. Africa. 
Subgenus Pirnecus. 
Muzzle large, elongated, somewhat rounded anteriorly ; forehead sloping backwards ; 
slight supraciliary ridges, but strong sagittal and lambdoidal crests. 
Facial angle 30°. 
Auricles small. 
Twelve pairs of ribs ; bones of the sternum in a double alternate row. 
Arms reaching to the ankle-joint. 
No ligamentum teres in the hip-joint. 
Feet long and narrow ; hallux not extending to the end of the metacarpal bone of the 
adjoining toe ; often wanting the ungueal phalanx and nail. 
Canines very large, their apices extending beyond the intervals of the opposite teeth. 
Intermazillarg bones anchylosed to the maxillaries during the second or permanent den- 
tition. 
Ex. The Orang Utan, or Red Orang. (Pithecus Satyrus, Geoff. Simia Satyrus, Linn.) 
Pongo, a name for the adult, originally applied to the Chimpanzee. 
Height under five feet. 
Hab. The islands of Borneo and Sumatra. 
VOL, I: 3D 
