THE APODID^E 



PART I 



SECTION I 



OBJECT AND LINE OF ARGUMENT 



THE Apodidae have been known and studied for 

 the last one hundred and fifty years. They have 

 always attracted considerable attention, not only on 

 account of their great size in comparison with other 

 fresh-water Entomostraca, but also on account of their 

 strange and sudden appearance in pools and ditches 

 which owe their water entirely to the rainfall. This 

 also is not all : their morphology has been a perpetual 

 puzzle to zoologists, and they have been classed by 

 some with archaic forms such as the Trilobites and 

 Limulus, while by others they have been considered 

 as highly specialised recent forms. 



This essay claims by a new explanation of the 

 morphology of the Crustacea, to set this latter point 



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