xm 



PHYLUM CHORDATA 



303 



ilium (//). Ossifications are formed in the iliac and ischiatic 

 regions, but the pubic region remains cartilaginous. The re- 

 semblance of the pelvis of the lower Urodela, and especially of 

 Necturus, to that of Polypterus (p. 232) and of the Dipnoi 





mi 









B 



Fig. 951.— a, i-it,'ht .side i)f shnnlder-girdle of Salamandra ; B, shouldev-girdle and sternum 

 of Amblystoxna (Axolotl) from the ventnil asjiL-rt. o, b, processes of scapulii/ ; C (in B), 

 coracoid ; CI. procoracoid ; Co. (in A), coracoid ; G. (in A), glenoid cavity ; I, its cartila- 

 ginous edge ; Pf (in B), glenoid ca\'ity ; S. scapula ; SS. supra-scapula ; st. sternum ; *, t, 

 nerve foramina. (From Wiedersheim's Comparalive Anatomy/.) 



(p. 250) is noteworthy. In Anura the pelvic girdle resembles that 

 of the Frog. 



Attached to the anterior border of the pubic region there occurs 

 in many Urodela and in Xenopus a rod of cartilage, forked in front. 



