INDEX 



165 



muUilineata 51 



muUilineata alba 51 



muUilineata algonquinensis 51 



muUilineata muUilineata 51 



muUilineata rubra 51 



obstricta 53 



palliata 40. 52 



pennsylvanica 55 



profunda 48 



profunda efasciata 48 



profunda profunda 48 



pustula 62 



sayana 148 



sayii 1 48 



stenolrema 58 



thyroides 56 



thyroidus 56 



tridentala 7. 45 



tridentata bidentata 45 



tridentata edentilabris 45 



tridentala frisoni 17, 18, 45 



tridentata tridentata 45 



tridentata unidentata 45 



zaleta 50 



Polygyratus, Euconulus chersinus. . . 76 



POLYGYRIDAE 20, 40 



pomatia. Helix 23 



Prairies 30 



Preserving snails 15 



procera 



Gasirocopta 102 



Gaslrocopta procera 102 



mcclungi, Gaslrocopta 102 



procera, Gaslrocopta 102 



proifunda 



efasciata , Polygyra 48 



Polygyra 48 



Polygyra profunda 48 



profunda, Polygyra 48 



Pronunciation of scientific names. . . 20 



Prosobranchiata 37, 39 



pulchella, Vallonia 118 



Pulmonata 4, 20, 37, 40 



Punctum 90 



pygmaeum 90 



Pupa 96 



edentula 109 



simplex 109 



Pupilla muscorum 147 



PUPILLIDAE 93 



Pupoides 108 



marginatus 108 



Pupoids 18, 23 



Pustula, Polygyra 62 



pygmaea. Helix 90 



pygmaeum, Punctum 90 



Pyramidula 



alternata 84 



perspectiva 87 



solitaria 85 



R 



Radula 5, 6. 7 



Records 12 



Reproduction of snails 9 



Retinella 69 



cryptomphala 71, 149 



electrina 69 



indentata 71 



rhoadsi 70 



u'heatleyi 70 



retusa 



decampi, Succinea 126 



illinoisensis, Succinea 126 



magister, Succinea 125 



peoriensis, Succinea 126 



retusa, Succinea 125 



Succinea 125 



Succinea retusa 125 



rhoadsi. Retinella 70 



Ribs of shell 18 



Rivers of Illinois 27 



rubra, Polygyra muUilineata 51 



s 



salleana, Succinea 127 



Say, Thomas 19. 25 



sayana, Polygyra 148 



sayii, Polygyra 148 



Scientific names 18, 19 



pronunciation of 20 



Sculpture, shell 18 



Selenites 92 



Shell 3, 4, 17, 18 



aperture of 4, 17, 18 



apex of 18 



cabinets 14, 16 



folds of 18 



growth lines 18 



ribs of 18 



sctdpture 18 



vials 14, 16 



Shells 



color of 18 



form of 17, 18 



snails with 3 



significans, Paravitrea 74 



similis, Gaslrocopta armifera 96 



simplex 



Pupa 109 



Vertigo 109 



singleyanus 



Helicodiscus 89 



inermis, Helicodiscus 89 



Slug 5 



Snail 3 



back of 3 



body 4 



eggs 9 



habitat 9, 13 



head 3.4 .5.6 



Snails 



classification of 17 



collecting 11 



collectors of Illinois land 25 



economic importance of 23 



food of 5,7 



hunting for 3 



identifying 20 



in geological history 30 



naming 18 



preserving 15 



reproduction of 9 



with shells 3 



solitaria, Pyramidula 85 



Species 19, 20 



Sphyradium edentulum 109 



spiralis, Strobilops aenea 115 



