19 



the scapnlo-eoracoidenm. Tliat portion, however, which is siill 

 blastematic, has lost its hoiuogeiieiiy. Compare the schemata of 

 fig. 5.) A more compact cranial border can be plainly distinguished; 

 the ventro-medial border is also more compact than the rest of tiie 

 blastema. Further, a likewise denser strip of blastema connects the 

 cranial border with the praechondral caudal portion. In these 

 com[)acier regions there is no praechondrinm however. The blaste- 

 matic spur proceeding from the cranial scapular border has become 

 slighth' longer, as also tlie fragment of bone Iviiig in it. It is 

 from this process that the clavicle develops; we shalT therefore 

 henceforth term it the clavicular process. The connection of the 

 scapnlo-coracoid and the clavicular process will be evident from the 

 two consecutive sections illustrated in fig. 2. The left section lies 

 cranial to the right one. In the former the ventral outgrowth of the 

 clavicular process can be seen; in the latter the connection with 

 the scapnio-coracoideum. 



Cora-coLdi- 



ovccuVb 



Med s|3<-nalu» 

 Fig. 2. Lacerta agilis K. Cross-section. 



The dark spot ar the place where the clax icular-jirocess goes out 



2* 



