No. 514] 



DINICHTHYID ARMOR PLATES 



59 J 



to make out the exact limits of their inner margins on 

 account of the weathering to which they have been sub- 

 jected. They lie in a plane higher (more ventral anatom- 

 ically) than the median plates and undoubtedly over- 

 lapped them slightly. On the posterior lateral borders 



of the postero-ventromedian lie the two postero-ventro- 

 laterals. The inner margins of these plates are also hard 

 to delimit. They were overlapped by the antom-vwitm 

 laterals, for they lie at a lower (anatomically more dor * a ^ 

 plane. The inner margins of all four of the lateral p nt< - 



