62 



NDEX 



climeana, Gaslrocopta 98 



contracla, Gaslrocopta 98 



Gastrocopla 97 



Gaslrocopta contracla 98 



corticaria, Gaslrocopta 101 



costata, Vallonia 116, 117, 119 



Counties of Illinois 27 



cronkhitei 



anlhonyi. Discus ^. . . . 86 



Discus 86 



cryplomphala, Retinella 71, 149 



cuprea, Omphalina 66 



cupreus, Mesomphix 64, 66 



D 



dealbatus, Bulimulus 63 



decampi, Succinea relusa 126 



demissus, Venlridens 82 



dentala, Polygyra albolabris 19, 49 



Denticle 18 



labial 18 



parietal 18 



peristomal 18 



Deroceras 128 



agresle 130 



campestris 130 



gracile 129 



Discus 86 



cronkhitei 86 



cronkhitei anthonyi 86 



Patulus 87 



dorfeuilliana, Polygyra 44 



dorsalis, Pallifera 132 



E 



Economic importance of snails 23 



edentala, Polygyra in flee ta 47 



edentilabris, Polygra Iridenlata 45 



edentula 



Columella 109 



Pupa 109 



edentulum, Sphyradium 109 



efasciata, Polygyra profunda 48 



Eggs, snail 9 



elatior. Vertigo 106 



electrina, Retinella 69 



elevata, Polygyra 55 



ELLOBIIDAE 135 



ENDODONTIDAE 22. 83 



Epidermis 17 



Epiphragm 12 



Euconulus 75 



cher sinus 76 



chersinus chersinus 76 



cher sinus polygyratus 76 



fulvus 75 



europaea, Testacella 142 



excentrica, Vallonia 118 



exiguum, Carychium 135, 136 



exile, Carychium 136 



exoleta, Polygyra 50 



Eye 3, 4 



peduncles 3,4 



F 



fallax, Polygyra 46 



Family 20, 22 



Feeding habits 5 



Feelers 3 



Ferriss hoe 13 



Ferriss, J. H 26 



Field data blanks 12 



flavus. Limax 23, 142 



fioridana 



Bifidaria penlodon 147 



Gastrocopla penlodon 147 



Fold 



basal 93. 110 



lower palatal 93 



palatal 110 



upper palatal 93 



Folds of shell 18 



Food of snails 5, 7 



Foot 4 



Form of shells 17. 18 



Foster, Thural Dale 19 



fosteri 



Pallifera 133 



Polygyra 19, 54 



raterna 



cava, Polygyra 61 



fralerna, Polygyra 61 



Polygyra 61 



Polygyra fralerna 61 



fraudulenla, Polygyra 46 



friabilis, Mesomphix 67 



frisoni, Polygyra Iridenlata ... 17. 18. 45 



fuliginosa, Zoniles 66 



fulvus, Euconulus 75 



G 



Gastrocopla 34, 94 



armifera 95 



armifera abhreviata 97 



armifera a finis 96 



armifera armifera 96 



armifera similis 96 



contracla 94. 97 



contracla abrupla 98 



contracla climeana 98 



contracla contracla 98 



corticaria 101 



holzingeri 19. 99 



penlodon 100 



penlodon floridana 147 



penlodon gracilis 100 



penlodon penlodon 100 



procera 102 



procera mcclungi 102 



procera procera 102 



tappaniana 101 



Gaslrodonla 81 



gularis 82, 150 



interna 150 



interlexla 82. 150 



Gastropoda 20. 33. 37 



Genus 19. 20 



Geological history, snails in 30 



Glacial periods 30 



GoLTLD. Augustus A 25 



gouldii, \'ertigo 103, 147 



gracile. Deroceras 129 



gracilis. Gaslrocopta penlodon 100 



grosvenorii. Succinea 124, 148 



Growth lines, shell 18 



gularis 



Gaslrodonla 82. 150 



Venlridens 82. 150 



