24 



Normentafeln zur Entwicklungsgeschichte der Wirbeltiere. 



Stage 



Series 



Length 



Age 



Body Form 



Somites 



44 



220 Trans. 



221 Sag. 

 223 Front. 



45 



224 Trans. 



225 Sag. 



226 Front. 



31 mm 



82 days 

 12 hrs. 



32 mm 



46 



227 Trans. 



229 Sag. 



230 Front. 



33 mm 



87 days 



92 days 



Notochord 



Nervous System 



Eye 



Ear 



In caudal region 

 larger than spinal 

 cord. Moreconstricted 

 in Centers of verte- 

 brae. Intervertebral 

 cartilages more pro- 

 minent. Layer of 

 bona thicker. 



47 



231 Trans. 



232 Sag. 



34 mm 



97 days 



General form of body 

 resembles adult. Ventral 

 surface of head and trunk 

 nearly in straight line. 

 Anterior and posterior 

 limbs project far below 

 ventral surface of body. 

 Pigmentation bands more 

 precisely marked. Dorsal 

 median dark band, below 

 this a light band, then a 

 broad dark band. 



Bone surrounding 

 anterior end thicker. 



Ribs better devel- 

 oped ; extend one half 

 of distance to lateral 



surface of body. 



Neural arches at base 



more completely 



ossified. 



