xiii PHYLUM CHORDATA 459 



Hapalida*, in which all except the halltix are provided with a claw. 

 The pollex is in some rudimentary or absent. The orbit is 

 .separated from the temporal fossa by a broad vertical plate, and 

 the lacrymal foramen is situated within the margin of the orbit. 

 The inner upper incisors are in close contact. The cerebral hemi- 

 spheres are usually richly convoluted, and completely, or nearly 

 completely, cover over the cerebellum. The uterus has no horns. 

 'The placenta is deciduate and metadiscoidal. 



Family i. Hapalidce. 



Anthropoidea with the pollex not opposable, all the digits 

 except the hallux provided with curved pointed claws, without 

 cheek-pouches or ischial callosities, with a broad nasal septum, 

 without bony external auditory meatus, and with a non-prehensile 



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tail. The dental formula (vide infra) is i. ~, c. ^, p. -r, m. ~ = 32. 



2i 1 o L 



This family includes the Marmosets (Hapale). 



Family ii.^-Cebidce. 



Anthropoidea with the pollex not opposable, all the digits pro- 

 vided with flat nails, without cheek-pouches or ischial callosities, 

 with a broad nasal septum; and without bony external auditory 

 meatus. The tail is sometimes prehensile. The dental formula 



. . 2 1 3 3 



is i. ^, c. -, p. ^,m. - = 36. 



This family includes the Howling Monkeys (Mycetes), Tee Tees 

 '(Callithrix), Squirrel Monkeys (Chrysothrix), Spider Monkeys 

 (Ateles), and Capuchin Monkeys (Cebus). 



Family iii. Cercopithecidce. 



Anthropoidea with the pollex, when present, opposable, with or 

 without cheek-pouches, with' ischial callosities, with a narrow 

 nasal septum and a bony external auditory meatus. The tail is 

 not prehensile. The sternum is narrow. The dental formula 



2123 



is i. p, c. -, p. ~, m. - = 32. The coecum is devoid of vermiform 



appendage. 



This family includes the Baboons (CynocepTialus) and Macaques 

 (Macaciis). 



Family iv. Simiidce. 



Anthropoidea with the pollex opposable, without cheek-pouches, 

 usually without ischial callosities, with a narrow nasal septum and 

 :a bony external auditory meatus. The pectoral limbs are much 

 longer than the pelvic. The coecum has a vermiform appendage 



