164 



INDEX 



friabilis 67 



inornatus 149 



perlaevis Perlaevis 68 



Perlaevis vulgalus 68 



micromphala, Slrobilops aenea 115 



milium 



meridionalis, Striatura 77 



milium, Striatura 77 



Striatura 77 



Striatura milium 77 



Vertigo 107 



minuscula 



Hawaiia 72 



Helix 72 



minusculus, Zonitoides 72 



minutissima, Helix 90 



mitchelliana, Polygyra 148 



Mollusca, see snail or snails 



Mollusk, see snail or snails 



monodon 



Helix 60 



Polygyra 60 



Morse, Edward S 19 



morsei. Vertigo 19, 104 



Mouth 4. 5, 6 



cartilage of 5,6 



Mucus 4 



glands 6 



multilineata 



alba, Polygyra 51 



algonqtiinensis, Polygyra 51 



multilineata, Polygyra 51 



Polygyra 51 



Polygyra multilineata 51 



rubra, Polygyra 51 



muscorum, Pupilla 147 



N 



Names, scientific 18, 19 



Naming snails 18 



Nason, W. a 26 



nitidus, Zonitoides 79 



nuttalliana, Succinea 147 



o 



obstricta, Polygyra 53 



occulta 



Helicina 39 



Hendersonia 39 



Omphalina cuprea 66 



Omphalina inornata 149 



Opeas mauritianum 140 



optima, Succinea ovalis 122 



Order 20 



Orifice, breathing 4 



ovalis 



optima, Succinea 122 



ovalis, Succinea 122 



Succinea 122 



Succinea ovalis 122 



ovata. Vertigo 105 



Oxychilus 



cellarium 139 



r.ellarius 140 



lucidum 140 



P 



Palatal fold 110 



palliala, Polygyra 40. 52 



Pallifera 132 



dorsalis 132 



fosteri 133 



Parallelus, Helicodiscus 88 



Paravitrea 73 



capsella 73 



significans 74 



Parietal 



denticle 18 



lamella 93. 110 



wall 18 



parietalis, Strobilops labyrinlhica . . .112 



parvula, Vallonia 1 19 



patulus. Discus 87 



Peduncles, eye 3. 4 



pennsylvanica, Polygyra 55 



pentodon 



floridana, Bifidaria 147 



floridana, Gastrocopta 147 



Gaslrocopta 100 



Gastrocopta pentodon 100 



gracilis, Gastrocopta 100 



pentodon, Gastrocopta 100 



peoriensis, Succinea retusa 126 



Periods, glacial 30 



Periostracum 17 



Peristomal denticle 18 



Peristome 18 



perlaevis 



Mesomphix perlaevis 68 



perlaevis, Mesomphix 68 



vulgalus, Mesomphix 68 



perspectiva 



Helix 87 



Pvramidula 87 



PHILOMYCIDAE 131 



Philomycus 131. 133 



carolinianus 131 



Physiography of Illinois 26 



PiLSBRY, Henry A 25 



Plain 29 



Polygvra 20, 22. 34, 41 



albolabris 4, 6. 9. 10, 20. 49 



albolabris albolabris 19, 49 



albolabris alleni 19. 49 



albolabris denlata 19, 49 



appressa 54 



clausa 57 



dorfeuilliana 44 



ela'ata 55 



exoleta 50 



fallax 46 



fosteri 19, 54 



fraterna 61 



fraterna cava 61 



fraterna fraterna 61 



fraudulenta 46 



hirsuta 59 



inflecla 47 



inflecta edentata 47 



iriflecta inflecta 47 



inflecta media .• 47 



leai 61 



leporina 62 



mitchelliana '48 



monodon 60 



