596 M. L. DOLLO. 



This may be expressed in the following formula 



Pstfr 



Homo. 



relations which are to found amongst the Sauropsida also. 



III. Lastly, I have by the study of the connections of the 

 bones materially strengthened M. Albrecht's theory, which 

 holds that the zygomatic portion of the squamous part of the 

 the temporal bone of Mammalia is the homologue of the quad- 

 rate of the lower gnathostomous Vertebrata. 



In conclusion, it is my duty, which is very agreable to me, 

 to thank ray learned friend. Professor P. Albrecht, for the 

 liberality with which he has placed at my disposal the wood 

 blocks which he has used in the illustration of his two recent 

 memoirs, and all the more so because they are to be used to 

 attack one of the theories of the distinguished anatomist 

 himself. 



