DEVELOPMENT OF MAMMALIAN BRAIN. 751 



In Bimana the placenta is relatively thicker and smaller than 

 in Quadrumana, and is attached to a relatively more contracted 

 area of the womb than in the tailed kinds. 



584 



Foetus in utero, at the end of gestation ; Human, ccxlvi". 



: At the end of pregnancy the fore part of the abdomen is occu- 

 pied by the uterus, fig. 584, the foetus being commonly carried in 

 the position there represented. 



Nine months is the usual period of gestation in Bimana ; but 

 occasionally birth occurs at the eighth or even the seventh month, 

 and the infant has been reared. A 



§ 407. Development of Mammalian Brain.— Limitation of 

 space compels me to conclude this chapter with a brief notice of 

 some of the more specially mammalian modifications of foetal 

 formation. 



