SKULL OF RANA TIGRINA. 8 



Text-figure 1. 



prn 



Bana tigrina ; dorsal view of skull. 



alinasal process : c.a., columella auris ; eo., exoccipital ; f., anterior fontanelle ; 

 f.o., fenestra ovalis ; fp , fronto-parietal ; m., maxilla ; n., nasal; p., palatine; 

 p.c, palatal cartilage ; pm., premaxilla ; p.nl., prenasal process ; po., prootic ; 

 p.r.. rostral process; p.rh., rhinal process; ps., parasphenoid ; pt., pteiygoid ; 

 q., quadrate cartilage ; qj., quadrato-jugal ; s., squamosal ; se., splienethmoid ; 

 sm., septo-maxillary ; s.n., septum nasi; sp., septum dividing the anterior part 

 of the splienethmoid ; st., stapes ; v., vomer. I, II, III, IV, V, VII, IX, X, 

 refer to the foramina for the exit of the cranial nerves. 



Text-figure 2. 

 p rn 



qj- 



B. tigrina ; ventral view of skull. 

 For explanation of the letters see text-rig. I. 



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