300 EMBRYOLOGY OF THE LOWEK VERTEBRATES ch. 



N 



Fig. 151. — Illustrating the development of the vertebral centre in Urodeles as seen in 

 horizontal sections. (Based on figures by Schauinsland, 1906.) 



A, Salwmandra, 22 mm. ; B, Siredon, 50 mm. ; C, Triton, 16 mm.; 5, bone ; c, cartilage ; ct, connective 

 tissue ; m, myotome ; N, notochord ; nc, notochordal cartilage ; v. blood-vessel. 



