Plate II. Ventral view of the chondrocranium. The cornua hyalia and 

 Meckel's cartilage have been removed. proc.Jatcr.ant., processus lateralis an- 

 terior; cart.acces., eartllago accessorins; lam.trans.ant., lamina tx-ansversalis 

 anterior; pr.clin.post., processus clinoideus posterior; procparoc, processus 

 paroccipiltalis ; *, opening in the thin lamella of cartilage between the basal 

 plate and the auditory capsule; fis.orh.nas., fissura orbito-nasalis. 



