326 A NATURALIST IN THE GREAT LAKES REGION 



Snails, aquatic: 

 A mnicola: 



dncinnaliensis, 175, 176, 233 



emarginata, 233 



limosa, 175, 176 

 Ancylus fuscus, 233, 288 

 Campeloma: 



integrum, 233, 289 



ponderosum, 233 



subsolidum, 233, 289 

 Goniobasis livescens, 232, 233, 288 

 Lymnaea: 



desidiosa, 176, 777 



humilis, 176 



reflexa, 176, 188, 233 



stagnates, 233 



woodruffi, 233 

 Physa: 



gyrina, 175 



heterostropha, 233 

 Planorbis: 



bicarinaius, 176, 177, 233 



campanulatus, 176, 777, 188, 233 



hirsutus, 176, 177 



parvus, 176, 177, 1 88 



trivolvis, 233 

 Pleurocera: 



elevatum, 232, 233 



subulare, 232, 233 

 Valvata tricarinata, 233 

 Vivipara: 



contectoides, 232, 233 



subpurpurea, 233 

 Snails, terrestrial: 

 Bifidaria armifera, 216 

 Circinaria concava, 214, 216, 227, 269, 



270 



Cochliocopa lubrica, 216 

 Helicodiscus parallelus, 216 

 Omphalina: 



friabilis, 214, 217, 270 



fuliginosa, 214, 216, 217, 227, 270 

 Polygyra: 



albolabris, 214, 215, 217, 226, 269, 

 270 



clausa, 217, 270 



fraudulenta, 214 



fraterna, 270 



hirsuta, 214, 215 



injlecta, 270 



monodon, 214, 216, 270 



multilineatus, 215, 217, 270 



oppressa, 214, 270 



palliata, 214, 215, 270 



pennsylvanica, 215, 2/7, 270 



profunda, 165, 215, 217 



thyr aides, 215, 2/7, 226, 269, 270 



tridentata, 215, 216 

 Pyramidula: 



alternata, 214, 216, 2/7, 227, 269, 

 270 



perspectiva, 214, 216, 2/7, 227, 270 



solitaria, 214, 216, 2/7, 269, 270 



striatella, 217 

 Succinea: 



avara, 216, 272 



ovalis, 216, 272 



retusa, 216, 272 

 Vertigo ovata, 216 

 Zonitoides arboreus, 165, 214, 216, 



217, 227, 270 



Snake, see Reptilia 

 Soil formation, 27 

 Solomon's seal, Polygonatum biflorum; 



false, Smilacina racemosa 

 Sowbug, 218 

 Sphaeridae, 184 

 Sphagnum moss, 194, 195 

 Sphalerite, 72 

 Spiders, see Arachnida 

 Spiderwort, Tradescantia iiirginica 

 Sporebearers (see also Ferns) : 

 Chara, 168, 172, 172, 178, 196 

 Cladophora, 234 

 Conocephalus, 265 

 Equisetum: 



arvensis, 260 



fluviatile, 195, 198, 248 



hyemale, 122, 260, 261 

 Hydrodicton, 234 

 Marchantia, 265 

 Oedogonium, 234 

 Riccia, 234 

 Ricciocarpus, 234 

 Selaginella rupestris, 265 

 Sphagnum, moss, 234 

 Spring beauty, Claytonia virginica 

 Spring flora, 92 

 Spurge: 



Flowering, Euphorbia corollata 

 Seaside, E. polygonifolia 

 Squirrel, see Mammals 

 Star flower, Trientalis americana 

 Star, new, 22 

 Stars: morning and evening, 21; 



number of, 21, 22 

 Starved Rock, 7, 8, 9 



