266 



CLASS AMPHIBIA. 



and continuous. In the higher Urodela (most Salamandridae) 

 the vertebrae are opisthocoelous. In the Anura they are usually 

 procoelous, though occasionally opisthocoelous and the noto- 

 chord is for the most part obliterated. 



JvK.-Ms: 



"■ Wlid\'.:sIdmf'AS^:^^^^^ columns of some Urodeles (after 



three anterior vertebrae :CA notochord • A Jr^^tTJu ^ •5«^?.'««'"^"««- L H, III. the 

 cup and ball ; Jvk intervertebral oartiKap.#K^''*"'"l cartilage ; Gp, Gk articulating 

 ligament; Mh marrow cavHy-i Svfrse nro..«,' • °i "'^l'"".'" ,' ^''^^ i .'tervertebral 

 notoohord ; »* the intervertebra cfrtHa^ ^ ** ' * ^^^t^^ral constriction of the 



