THE NAUTILUS. 



Unionidffi, African forms . 



Unionidse, Asiatic forms . 



Unionidte, North American forms 



Unionidfle of Pearl and Sabine Rivers 



Unionidffi, South American forms 



Unionidffi, notes on oriental 



Unionidse, The discharge of the glochidia 



Whitfield, Professor Robert Parr 



Zonitoides milium from the District of Columbia 



. 107 



. 106 



. 104 



. 134 



. 108 

 92, 97 



. 94 



. 11 



. 24 



