FCETAL NUTRITION: THE PLACENTA 



441 



Jenkinsou 1 has lately investigated the placenta in a species of 

 Lepilemur and found that it conforms in structure to those of other 

 members of the Lemuroidea excepting Tarsius. " In the Lemuroid 



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placenta the relation between fo?tal and maternal circulations is 

 brought about by the production of- vascular trophoblastic villi, which 

 fit into crypts lined by a persistent uterine epithelium. So the 

 placenta, therefore, resembles that of an ungulate: it is of the so- 

 called ' Indeciduate ' type. The allantois is large and occupies a great 



1 Jenkinson, "The Placenta of the Lemur," (Jvar. Jour. Mi<v. - ^ ol. Ixi., 



1915. 



