62 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 51 



The first trace of the urinary system is seen as a dorsally project- 

 ing, solid ridge of mesoblast in the middle region of the embryo, 

 which ridge soon becomes hollowed out to form the Wolffian duct. 



The origin of the pituitary and pineal bodies is clearly seen ; the 

 latter projects backward. 



No connection can be seen between the first rudiments of the sym- 

 pathetic nerves and the central nervous system. 



The lumen of the oesophagus is for a time obliterated as in other 

 forms. 



The choroid fissure is a very transitory but well-marked feature 

 of the eye. 



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