INDEX OF SUBJECTS 



365 



Snails — Continued: 



— Campeloma, 99, 103, 104, 106: 



integrum, 107, 108, 117, 123. 



subsoliduni, 100, 117. 

 — Goniobasis, 103: 



livescens, 95, 98, 103, 116, 121, 123, 



126, 135. 

 — Lymnaea, 84, 104, 131, 145: 



exigua, 173, 185. 



lanceata, 85. 



modicella, 114, 121, 154, 174, 181, 



186, 187. 



obrussa, 154. 



reflexa, 147, 149, 154, 174, i75i 185, 



189. 



reflexa exilis, 154. 



stagnalis, 83. 



woodruffi. 79, 80, 84. 

 —Physa, 1 45-151: 



gyrina, 93, 114, 118, 121, 131, 135, 



154, 173, 185. 



heterostropha, 154, 173. 



integra, 104, 117, 131. 

 — Planorbis, 173, 185. 



bicarinatus, 39, 83, 99, 104, 117, 121, 



123, 154. 



campanulatus , 114, 131, 135, 147, 149, 



154. 



deflectus, 154. 



exacuosus, 154. 



exacutus, 83. 



hirsutus, 148, 149, 154. 



parvus, 116, 131, 135, 148, 149, 154, 



204. 



trivohis, 16, 149, 150, 152, 154. 

 — Pleurocera, 99, 103: 



elevatum, 106, 107, 108, 121, 123. 



elevatum lewisii, 117. 



subulate, 39, 126, 127, 135. 



subulate internum, 121. 

 — Pleuroceridae, 84. 

 — Segmentina armigera, 131, 135, 154. 

 — Valvata, 80: 



bicarinata perdepressa, 83. 



s nicer a, 83. 



tricarinata, 83. 

 — Vivipara contectoides , 126, 128, 152. 

 Snails, hibernation of, 192. 

 Snails, terrestrial, scientific names: 

 — Circinaria concava, 200, 204, 206, 237. 



253. 

 — Omphalina fuliginosa, 2 53 . 

 — Polygyra: 



albolabris, 197, 207, 215, 237, 243, 254. 



clausa, 200. 



fraudulenta, 243, 256. 



inflecta, 234, 256. 



monodon, 190, 213, 215, 254, 263. 



multilineata, 206, 234. 



oppressa, 243, 256. 



palliata, 243, 256. 



pennsylvanica, 236, 237. 



profunda, 200, 202, 215, 236, 237. 



thyroides, 200, 202, 208, 213, 215, 



234, 252, 254. 

 — Pyramidida, 214, 215, 243: 



alternata, 192, 200, 236, 237, 243, 247, 



253, 254. 



perspectiva, 256. 



soHtaria, 236, 237, 243, 256. 



striatella, 190. 

 — Succinea: 



avara, 187, 199, 202, 208, 282. 



ovalis, 208, 263, 264. 



retusa, 169, 187, 189, 199, 202, 204, 



208. 

 — Vitrea indentata, 205. 

 — Zonitoides, 215: 



arboreus, 190, 206, 234, 236, 243, 247, 



253, 306. 

 Snakes, food of skunks, 269. 

 Soil: 157-59; effect of, on organisms 

 159; factor in distribution, 301, 

 humus, 158-59. 



Sowbugs or Isopoda, aquatic, scientific 



names: 

 ■ — Asellus communis, 90, 98, 114, 121, 



154, 174, 185, 206. 

 ■ — Mancasellus danielsi, 135, 154, 174. 

 Sowbugs, terrestrial, scientific names: 

 — Cylisticus convexus, 239, 253. 

 ■ — Porcellio rathkei, 200, 240, 254, 253. 

 Sparrow: chipping, 274, 275; field, 274, 

 275; grasshopper, 167, 289; lark, 275; 

 song, 262, 268, 275; vesper, 167. 

 Sparrow-hawk, 274. 

 Species, animal: 1; number of, 1; plant, 



1; use in ecology, 3. 

 Sphaeridae, scientific names: 

 — Calyculina transversa, 83. 

 — Musculium, 118, 179, 189. 



partumeium, 147, 153. 



secure, 147, 153, 185. 



truncatum, 121, 147, 153. 

 — Pisidium, 81: 



compression, 83. 



idahoense, 83, 133. 



punctatum, 83. 



scutellatum, 83. 



variabile, 83. 



ventricosum, 83. 

 — Sphaeridae, 69, 80, 83, 100, 103, 147, 



I5 1 , 153- 

 — Sphaerium, 108: 



stamincum, 107, 116, 121. 

 striatininn, 80, 83, 116. 

 vermontanum, 79, 84. 



