CRANGON VULGARIS. 35 



5. All of the appendages belong to the primitively post- 

 oral series, and the appendages move forward more rap- 

 idly than the corresponding ganglia. 



6. There are indications of segmental sense organs in 

 every segment of the embryo. 



7. The alimentary tract proper is nearly, if not en- 

 tirely, formed from the proctodeal and stomodeal in vagi- 

 nations, theentoderm giving rise to nothing but the liver. 



8. The green gland is mesodermal in origin and be- 

 longs to the category of segmental organs. 



9. The genital ducts are modified nephridia. 



10. The nauplius is an introduced feature and repre- 

 sents no adult ancestral condition in the crustacean phylum. 



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