326 A NATURALIST IN THE GREAT LAKES REGION 



Snails, aquatic: 

 — Amnicola: 



cinclnnatiensis, 175, 176, 233 



emarginata, 233 



limosa, 175, iy6 

 — Ancyhis fuscus, 233, 288 

 — Campcloma: 



integrum, 233, 289 



ponder sum, 233 



suhsolidiim, 233, 289 

 — Goniohasis livescens, 232, 233, 288 

 — Lymnaea: 



desidiosa, 176, 177 



humilis, 176 



rejiexa, 176, 188, 233 



stagnalis, 233 



woodrujji, 233 

 — Physa: 



gyrina, 175 



heterostropha, 233 

 — Planorhis: 



hicarinatus, 176, 177, 233 



campamdatus, 176, J77, 188, 233 



hirsiitus, 176, 777 



parvus, 176, 777, 188 



trivolvis, 233 

 — Pleurocera: 



elevatum, 232, 233 



subulare, 232, 233 

 — Valvata tricarinata, 233 

 — Vivipara: 



contectoides, 232, 233 



suhpurpurea, 233 



Snails, terrestrial: 



— Bifidaria armifera, 216 



— Circinaria concava, 214, 216, 227, 269, 



270 

 — Cochliocopa luhrica, 216 

 — Helicodiscus parallelus, 216 

 — Omphalina: 



friabilis, 214, 217, 270 



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

 — Polygyra: 



albolabriSf 214, 215, 217, 226, 269, 

 270 



clansa, 217, 270 



fraudulenta, 214 



fraterna, 270 



hirsuta, 214, 215 



inflecta, 270 



monodon, 214^ 216, 270 



muUilineatus , 215, 217, 270 



oppressa, 214, 270 



palliatay 214, 215, 270 



pennsyhanica, 215, 277, 270 



profioida, 165, 215, 277 



thyroides, 215, 277, 226, 269, 270 



tridentata, 215, 216 

 — Pyramidida: 



alternata, 214, 216, 277, 227, 269, 

 270 



perspectiva, 214, 216, 277, 227, 270 



solitaria, 214, 216, 277, 269, 270 



striatella, 217 

 — Succlnea: 



avara, 216, 272 



ovalis, 216, 272 



retusa, 216, 272 

 — Vertigo ovata, 216 

 — Zonitoides arboreus, 165, 214, 216, 



277, 227, 270 



Snake, jee Reptilia 



Soil formation, 27 



Solomon's seal, Polygonatum biflorum; 

 false, Smilacina racemosa 



Sowbug, 218 



Sphaeridae, 184 



Sphagnum moss, 194, 195 



Sphalerite, 72 



Spiders, 5ee Arachnida 



Spiderwort, Tradescantia virginica 



Sporebearers (^ee a/^o Ferns) : 



— Chara, 168, 172, 772, 178, 196 

 — Cladophora, 234 

 — Conocephalus, 265 

 — Equisetum: 



arvensis, 260 



fluviatile, 195, 198, 248 



hyemale, 122, 260, 261 

 — Hydrodidon, 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 IMammals 



Star flower, Trientalis americana 



Star, new, 22 



Stars: morning and evening, 21; 

 number of, 21, 22 



Starved Rock, 7, 8, 9 



