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EXPLANATION OF PLATES XX., XXI. 



Referknoh LuTTPms. 



:= Ampulla on longitudinal Bidder's canal. 



^ Blood-space. 



:= Ciliated part of uriniferous tubule. 



=: External opening of nephrostome. 



= Glomerulus in Malpighian body. 



= Gland (?) 



r= Internal opening of nephrostome. 



= Connective tissue forming supportive substance of 



kidney. 

 := Mesorchiura. 

 =: Neck of uriniferous tubule 



