FOSSIL AND RECENT 



155 



SOSC 



. 10mm 



ot.s.c 



asp 



pto 



soc 



epo 



Fig. 75. Albula vulpes (Linnaeus). Neurocranium in dorsal view. Course of sensory 

 canals shown by dotted line on left side. Composite of several B.M.N.H. specimens. 



converge there is a deep, anteriorly directed pit which ends blindly within the body 

 of the dermethmoid ridge. The ethmoid cartilage is ossified at its extreme anterior 

 end in older individuals where perichondral bone surrounds spongy endochondral bone. 

 Anteriorly the mesethmoid bears two articulatory facets set one above the other. 

 Both facets are for articulation with the premaxilla. Pterothrissus has a single 

 premaxillary facet. 



