RODENTIA. 



riff. 248. 



369 





Dipus hersipes. 



Bones of the cranium. The bones of the raina are united into one, in front of which 

 cranium in the Rodentia present several pecu- the sphenoid forms a single vertical lamella, 



Fig. 251, 



Spalax typhtut. 



Skull of the Hare. 



liarities in their arrangement, which it will be an evident approximation to what is found in 

 necessary to notice. birds. 



Fig. 2.50. 



Bathiergus mciriihnus. 



In the hare*, the anterior sphenoid is very The os fronds presents a strong supra- 

 remarkable, inasmuch as the two optic fora- orbital crest, which is deeply notched both 

 * Cuvier, Anatomie comparee, last edition. before and behind. It advances on each side 



VOL. IV. B B 



