SKELETON 



243 



is reduced; the post-temporal is vestigial, and suspended in a 

 ligament ; a very small cleithrum surmounts the clavicle, and the 



, 2 



20 



FIG. 211. 



Le.pidosire.n paradoxa, Fit/.. (After Bridge.) A, left-side view, and B, dorsal view of tin- 

 skull. C, outer view of the left, and U, inner view of the right minus of the lower jaw. 1, 

 nasal capsule ; 2, ethmoid ; 3 and 7, process of pterygo-palatine ; 4, antorbital cartilage ; 5. 

 palatine tooth; 6, lateral (dermal lateral ethmoid); 8, occipital (fr onto- parietal) ; 9, ptx-rygo- 

 palatine ; 10, quadrate; 11, squamosal ; 12, ceratohyal ; 13, subopercular and opercular; 14, 

 cranial rib ; 15, parasphenoid ; 16, neural arch ; 17, neural spine ; 18, splenial tooth ; 19, spleuial ; 

 'JO, Meckel's cartilage ; 21, articular cartilage ; 22, angular ; /, foramen for facial, g, for glowso- 

 }>haryngeal, t, for trigeminal, and r, for vagus nerve. 



FIG. 212. 



Pectoral girdle of A, Ceratodns ; B, I'olyptcrtis. Ventral view. (From Gegenbaur, Veryl. 

 Aiiat.) Cl, clavicle ; Cl', cleithrum ; g, articular facet for fin-skeleton. 



cartilage is subdivided into a ventral median piece, and two more 

 dorsal pieces supporting the fins. 



