BY C. D. GILLIES AND EDNA F. PEBERDY. 121 



EXPLANATION OF LETTERIN(i 



a.d.r. anterior dorsal ramus of premaxilla. 

 c. cartilage. 

 /. anterior fontanelle. 

 f.m. foramen magnum. 

 f.p. fronto-parietal. 

 ni. maxilla. 



m.pt.j. maxillo-pterj'goid junction. 

 }H.r. maxillary ramus of premaxilla. 

 m.r.'pa. median ramus of parasphenoid. 

 na. nasal. 



na.p. nasal process of maxilla. , 



OCX. occipital condyle. 

 oc.ot. occipito-otic region. 

 p. posterior process cf parasphenoid. 

 pal. palatine. 

 pm. premaxilla. 



p.r. posterior ramus of premaxilla. 

 pt.a. posterior ramus of pterygoid. 

 pt.b. anterior ramus of pterj'goid. 

 . pt.c. internal ramus of pterygoid. 

 q. quadrate. 

 q.j. quadrato-jugal. 

 sph.eth. sphenethmoid. 

 sq.a. long ramus of squamosal. 

 sq.h. anterior ramus of squamosal. 

 sq.c. posterior ramus of squamosal. 

 tr.r.pa. transverse portion of parasphenoid. 

 vo. vomer. 

 vo.t. vomerine teeth. 



X. position of anterior extremity of fronto-parietal. 

 II. optic foramen. 



Vj. foramen of maxillo-mandibular of trigeminal. 

 Vj. foramen of ophthalmic of trigeminal. 

 V3. entrance of ophthalmic of trigeminal into olfactory region. 

 IX.X. common foramen of glossopharyngeal and vagus. 



