The Structure of Dinichthys 



l<5l 



Text-figure 43. 

 A total reconstruction of the head of Dinichthys, viewed from above. 



EB, externo-basal; C, central; M, marginal; MB, median-basal; Or, orbit; P, pineal; PM, post-marginal; PrO.pre-orbital; 



PtO, post-orbital; R, rostral. 



MD is always strongly flattened. Very often two clefts run from the front to the 

 hind margin on both sides of the median line. The distance between them increases 

 towards the back. In addition many small and large clefts cross its thinner side parts in 

 various directions. The front angles are also often microstructurally deformed. All 

 these circumstances make MD very flat. Therefore during the reconstruction it must 

 not be forgotten that in reality it was quite strongly curved. 



On the underside, partly along the front and partly along the side margin, is a very 



