CONTENTS 



Page 



Preface v 



List ok Illustrations ix 



Land and Fresh Water Mollusks, bv VVii.ijam IL Dam.. 



General discussion and results i 



Summary of distribution of fresh water species in Alaska 



and adjacent regions i 



Table of distribution of fresh water species according to 



drainage systems now existing 4 



Summary of dislribution of land shells of Alaska and ad- 

 jacent regions 7 



Table of distribution of American land shells .S 



Summary of tlie mollusk fauna of northeastern Asia <j 



Table of distribution of northeast Asiatic land and fresh 



water shells 14 



Conclusions in regard to flu- .Maskan fauna 13 



Systematic catalogue of land and frt-.!! water niollusks of 



North America nurth nS the forty-ninlli parallel 19 



Bibliography '47 



Index to genera and species 157 



Hydroids, by C. C. Nitttinc. 



Introduction '75 



Geographic distribution i'/(> 



Systematic discussion 181 



Bibliography 207 



Volume Index .,,,,.,, -35 



(vii) 



