DEVELOPMENT OF MAMMALIAN BRAIN. 



51 



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 gcstntiun ; 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. 



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. 



