Terry — The Nasal Skeleton of Amblystoma punetatum. 121 



to regard the independent chondrification of the ethmoidal 

 column of Amblystoma as evidence of a phylogenetic reduc- 

 tion process in its nasal skeleton. 



In Amblystoma the cartilaginous nasal capsule does not 

 arise independently of the brain-case. It is from the begin- 

 ning a part of the ethmoidal skeleton which is built in con- 

 nection with the trabeculae, ethmoidal columns and antorbital 

 processes. In the development of the cartilaginous ethmoi- 

 dal skeleton there are foTmed pari passu, a capsular covering 

 for the epithelium of the nasal sac and protecting wails for 

 the olfactory bulb. 



LITERATURE REFERRED TO. 



'01. Bardeen, C. R., Born's method of reconstruction by 



means of wax plates. Johns Hop. Bull. XII. 1901. 

 '94. Bawden, H. H., The nose and Jacobson's organ with 



especial reference to the Amphibia. Jour. Comp. 



Neurol. IV. 1894. 

 '76. Born, G., Ueber die Nasenhohlen und Thranennasen- 



gang der Amphibien. Morph. Jahrb. II. 1876. 

 *02. Bruner, H. L., The smooth facial muscles of Anura and 



Salamandrina. Morph. Jahrb. Bd. XXIX. 1902. 



