170 



DR. G. BAUR. 



articulation of the lower jaw of Vertebrates, and groups them 

 in the following table : 



Consequently, whilst Huxley assumes the lower jaw of the 

 lower Vertebrates to be homologous with that in the Mammalia, 

 Gegenbaur, Kolliker, and Wiedersheim see in the lower jaw of 

 Mammals only the deutary piece of that in the remaining 

 Vertebrates. 



In the next table Albrecht sets forth the various views as to 

 the development of the auditory ossicles in the Mammalia. 



I. — Visceral Arch. 



II. — Visceral Areh. 



Auditory Canal. 



iteichert 

 Gunther 



Gegenbaur j 



Huxley . . 



Parker . . 

 Parker . ") 

 Bettany . _) 

 Salensky 



1st Theory 

 Salensky 



2nd Theory 



Kolliker. ( 



Wiedersheim 

 Fraser . . 



Malleus . incus 

 Malleus . incus . stapes 



Malleus=articulare \ 

 Incus =quadrate 1 



Malleus=quadrate 



Stapes 



Os lenticulare 



(symplectic) 

 Stapes=hyomandi- 



bular 

 Incus =hyomandi- 

 bular, os lenticulare, 

 stapes 



j> 

 Incus =hyomandi- 

 bular 



> Stapes. 



Malleus . incus . stapes 

 Malleus . incus 



Malleus=articulare 

 Incus =quadrate 



Malleus 



Iucus=os lenticulare 



Stapes (outside 

 the periarterial 

 tissue). 



Stapes. 



Stapes (outside 

 the periarterial 

 tissue). 



1 A. Fraser, " On the Development of the s s i c u 1 a a u d i t u s of the Higher 

 Mammalia," ' Phil. Trans.,' vol. 173, part iii, 1882. 



