10-t 



COMPARATIVE ANATOMY 



A 



Mute. 



Pr. front; 



. 

 Fr.par. 



II. Pier. 

 AVI 

 J^JIL 



- til ff %; 



FIG, 



AXD 



x 



2), 



B, DORSAL AND VENTRAL VIEWS OF THE SKULL OF 

 IN B THE INVESTING BONES AKE REMOVED ON THE RIGHT SITE. 



Ajj.n3x.int, internal nostril: AI-<:.HH!>O<-, subocular or palatopterygoid arch; 

 C.2J)'-<>(f, inferior prenasal cartilage; Cr.x. a, subnasal crest ; Eth, spheneth- 

 moid ; F II l r , foramina for cerebral nerves ; Foss.cond, condyloid fossa, in 

 which are the foramina for the IXth and Xth cerebral nerves ; Fr.ji'n; 

 frontoparietal ; I. max, premaxilla ; J/o.c. maxilla ; Nn, nasal ; Occ.lat, ex- 

 occipital ; Pal, palatine ; Para, parasphenoid ; Pr. front, frontal process of 

 maxilla ; Proof, prootic ; Pr.-.t/<j, zygomatic process of paraquadrate ; 

 Pr.l><ix.lJ, basal process of quadrate; .Pr^ier. <J), pterygoid process of quad- 

 rate ; Ptf.r, pterygoid : <J nm.<-, quadratojugal (or quadratomaxilla) ; ijuailr, 

 quadrate; TnH.xyii, tectum synoticura ; Ty, paraquadrate (" squamosal ") ; 

 Vom, vomer. 



Anura. The skull of adult tailless Batrachia is at first sight 

 very similar to that of Urodeles : it is platybasic, and the occipital 

 region has the same morphological value. It undergoes, however, 



