CONTENTS 



The Frank Collins Baker Collections 7 



Description of Fossils 8 



Amnicola greenensis Baker . 8 



Amnicola lustrica gelida Baker 8 



Amnicola precursor Baker 9 



Amnicola winkleyi leightoni Baker 9 



Bulimus tentaculatus magnalacustris Baker 9 



Carychium perexiguum Baker 10 



Fossaria dalli grandis Baker 11 



Gonyodiscus macclintocki Baker 11 



Gonyodiscus macclintocki angulata Baker 12 



Gyraulus cressmani Baker 12 



Gyraulus pattersoni Baker. 12 



Menetus kansasensis Baker 13 



Parapholyx packardi corrugata Baker 13 



Planorbis altissimus Baker 13 



Planorbis campanulata ferrissi Baker 14 



Planorbis parvus urbanensis Baker 14 



Planorbula indianensis Baker 15 



Polygyra appressa hubrichti Baker 16 



Polygyra hirsuta yarmouthensis Baker 16 



Polygyra monodon peoriensis Baker 16 



Polygyra multilineata altonensis Baker 16 



Polygyra multilineata wanlessi Baker .17 



Polygyra proj 'unda pleistocenica Baker 17 



Pomatiopsis scalaris Baker 17 



Stenotrema hubrichti Pilsbry 18 



Strobilops sparsicostata Baker 18 



Succinea grosvenorii gelida Baker 19 



Succinea ovalis pleistocenica Baker 19 



Succinea retusafultonensis Baker 19 



Valvata lewisii precursor Baker 20 



Valvata sincera illinoisensis Baker 20 



Valvata tricarinata supracarinata Baker 20 



Vertigo gouldii loessensis Baker 21 



Vertigo hibbardi Baker 21 



Selected bibliography 22 



ILLUSTRATIONS 



Plate 1 facing 10 



Plate 2 facing 11 



Plate 3 facing 14 



Plate 4 facing 15 



