( 35 ) 



iie medial on this level, and generally form, wilh lliose from the 

 opposite side one nucleus. This last is also specially disliiu't in 



Fig. 10. Rana temporaria. 



Fig. 11. Alligator sklerops. 

 t.s-c. = torus semicircularis. 



chelone midas, as is shown in fig. 12, in the region of the caudal 

 part of the commissura posterior. The clumsy form of the cells is 

 clearly seen here, with a few of a rounder form; the latter are 

 relatively more numerous in the more distal planes. 



Neither in varanus sahator nor in eunectes murinus is 'this united 



<3o<fe3--^ 



9 



C7 



^, 



<3> 





Fig. 12. Chelone midas. 



medial nucleus found so well represented ; only a few cells here 

 touch both sides of the medial line. Laccrtilia and ophidia possess 



3* 



