leoi.] 



LBMUB MONGOZ AKD L. RUBRIVBNTBE. 



259 



69) It always forms the roof of a pneumatic cavity, which 

 often (Lemur' catta, Lemur macaco, Lemur mm«) is but an 

 appendix of the maxillary sinus. The anterior Portion of the 

 palatal also participates, as a rule, m the formation of this 



Text-fig. 67. 



Left orbital region of Lepulolemur grandidieri (Br. M. 68.9.7.4), | nat. size. 



S.=intercalarbone; as.=alisphenoicl ; m'.=maxillary ; ^«.=malar; 



other letters as m text-tig. bi. 



Text-fig. 68. 



>m0^. 



Keversed ric'ht orbital region of Hapalolemiir griseus (Br. M. 67.9.1.12), 

 ° I nat. size. 



,«^.= maxillary; ma.=malar; other letters as in text-fig. 61. 



pneumatic cavity, by forming i^^PO^terior c«Z-cj.-.«c (^^^^^^^^ 63 

 fi4 n 257) But the early union of the palate-bone with tlie 

 nlanum renders it verv difficult to state for every genus and every 

 f^^A^ where no young stages were available and no sections 

 cfu Id be mad'e of tL sLll, in what degree, if at all, the pala al 

 Intakes in the formation of the walls of the pneumatic cavity. 



