222 



COMPARATIVE ANATOMY 



Fig i8i —Diagram of the bones of the mammalian skull. Cartilage bones dotted, 

 membrane bones lined; 2-12, nerve exits. (Altered from Flower, from Kingsley's 

 "Comparative Anatomy of Vertebrates.") 



FRONTAL, 

 PREFFONTAL' 

 LACRIMAL' 



SEP70MAXILLARY. 

 MAXILLA 

 PRFMAXILLARY- 



LACRIMALv 

 NASAL- 

 MAX I LLAs 



SEPTOMAXILLARY- 

 PREMAXILLARY- 



MAXILLA 

 SEPTOMAXILLARi' 



PREMAXILLAR' 



NASAL- 

 PREMAXILLjARY- 



OCClPlTAL 

 -TEMPORAL 



(mandible) 



Fig. 182.— a series of fossil skulls (A-G) which are believed to represent fairly well 

 the phylogenetic changes of the human skull. (Redrawn after Romer's "Man and the 

 Vertebrates," University of Chicago Press.) 



