266 



CLASS AMPHIIilA. 



and continuous. In the higher Urodela (most Salamandridae) 

 the vertebrae are opisthocoelous. In the Anura they are usually 

 procoelous, tliough occasionally opisthocoelous and the noto- 

 chord is for the most part obliterated. 



Li at 



Mh ^ 



?x"r- i T^°'!^'*".'''^'''' .sections through the vertebral columns of some Urodeles (after 

 Wiedersheim). A Ramdens, B Amblystoma, C Spelerpes, D SalamandrZl I 11 III the 

 three an erior vertebrae; C/i notochord ; Ck intravertebral cartilagr;G^ g1-' articulating 

 cup and ball; JvJc intervertebral cartilage; K bone of centrum Z?^<intervertebraf 



nSor^ • -'V,""""."'" 'T^^i ^ tfansverse process; -S vertebrli coi? t iction of the 

 notochord ; ** the intervertebral cartilage. ■ 



