IN THE LOWER ANIMALS, ETC. 341 



comparison with the human maxilla. The molar 

 teeth, instead of being arranged in a gradual curve, 

 are placed in straight and nearly parallel lines ; 

 the incisors forming a line at right angles with the 

 molars in each jaw. 



In the specimen on the table we have a fine 

 example of the skull of an adult orang, probably 

 aged from forty to fifty years. The tubercles of 

 the molars are greatly worn down, the canines are 

 much abraded, and the incisors have been sub- 

 jected to so severe attrition, that they are 

 truncated to more than half the length of their 

 crowns. 



Of the genus Troglodytes there are two species, 

 the chimpanzee and gorilla, both natives of Africa, 

 and invariably covered with black hair. The 

 upper central incisors in the chimpanzee are not 

 so disproportionately large compared with the 

 laterals, and the space between the lateral in- 

 cisor and canine is narrower than in the orang. 

 There is also a greater difference in size between 

 the premolars and true molars, and the third 

 molar is smaller than the others, exhibiting a 

 nearer approach to the human dentition. 



The great gorilla is the most formidable of all 

 the apes. Solitary in its habits, it is so ferocious 

 an antagonist that it has furnished a subject for 

 many a traveller's tale of wonder, from the time 

 of Hanno, the Carthaginian navigator (who records 

 his adventures with wild, fierce men, covered with 



