CLASSIFICATION AND DISTRIBUTION OF ANIMALS. 339 



mentioned, are found in the relatively large cranium and brain. 

 In the Gorilla, for example, which is better developed in these 

 respects than other apes, the brain volume and brain weight are 

 30-35 cubic inches and about 24 oz., as compared with 55-115 

 cubic inches and over 40 oz., in Man. The cerebellum of apes is 

 larger in comparison with the cerebral hemispheres. The cranial 

 capacity of Man is, of course, proportionately large, while the 

 facial part of the skull is relatively small (cf. p. 322), and the 

 cranio-facial angle is less than in apes. The nasal bones of Man, 

 however, project more, and there is a mental prominence (chin) 

 at the mandibular symphysis. 



CHAPTER XV. CLASSIFICATION AND DISTRIBUTION 

 OF ANIMALS. 



THE following is a brief outline of the classification of animals 



(cf. p. 3) :- 



DIVISION A. PROTOZOA. 



Unicellular animals (or if multicellular, as Collozoum, the cells 

 are all similar and independent), not reproducing by means of 

 sperms and ova. 



GROUP 1. RHIZOPODA (Amceba). Protozoa devoid of 

 cuticle, and possessing pseudopodia. 



GROUP 2. INFUSORIA (Torticella). Protozoa covered 

 by a cuticle and possessing flagella or cilia. 



GROUP 3. SPOROZOA (Gregarinida) (Gregarina). 

 Endoparasitic spore-producing Protozoa, covered by a cuticle 

 but devoid of cilia or flagella. 



DIVISION B. METAZOA. 



Multicellular animals, made up of tissues, and reproducing by 

 sperms and ova. 



