Indec 



261 



Pisidium henslowanum, 165, 214. 

 Pisidium neglectum, 109, 133, 164. 

 Pisidium overi, 109, 164. 

 Pisidium pauperculum, 97, 109, 



.133, 164. 

 Pisidium punctatum simplex, 97, 



103, 164. 

 Pisidium sargenti, 97, 164. 

 Pisidium scutellatum, 94, 97, loi, 



103, 109, 133, 164. 

 Pisidium scutellatum cristatum, 94, 



97, lOi, 103, 109, 164. 

 Pisidium splcndidulum, loi, 164. 

 Pisidium variabile, 94, 97, loi, 103, 



107, 109, 164. 

 Pisidium vesiculare, 109, 164. 

 Plaice, 208, 209. 



Placobdella montifera, 97, 184, 18S. 

 Planaria dorotocephala, loi, 103, 



138, 184, 187. 

 Planaria gonoccpliala, 188. 

 Planaria maculata, 96, 103, 107, 



109, 138, 1S4, 187, 188. 

 Planarian worms, 81. 

 Plankton, 17, 18, 19, 41, 86, 87, 



186, 188, 190, 204, 216. 

 Plankton algae, 151. 

 Plankton eaters, 219. 

 Planorbis, 8r, 95, 105, iii, 114, 121, 



148, 154, 155. 159, 223. 

 Planorbis antrosus, 92, 94, 97, loi, 



103, 107, 109, 121, 143, 154, 175, 



Planorbis binneyi, 78, 92, 97, loi, 



127, 138, 152, 158, 175. 

 Planorbis campanulatus, 77, 92, 94, 



97, loi, 103, 107, 109, 123, 133, 



138, 175- 

 Planorbis deflectus, 94, 176. 

 Planorbis exacuous, 76, 94, 97, loi, 



103, 107, 109, 133. 138, 143, 176, 



214. 

 Planorbis hirsutus, 92, 94, 97, 103, 



107, 109, 123, 133, 138, 176. 

 Planorbis parvus, 75, 76, 92, 94, 95, 



97, 99, loi, 103, 105, 107, 100, 



116, 123, 127, 120, 133, 137, 138, 



143, 146, 147, IS3, 159, 176. 

 Planorbis trivolvis, 107, 154, 174, 



Planorbis trivolvis fallax, 92, 94, 

 97, loi, 109, 154, 174, 175. 



Planorbidae, 205. 



Plants, floating, 212. 



Plants, lower, 81. 



Plants, microscopic, 81. 



Plants, systematic list, 78. 



Plants, unicellular, 81. 



Plants, value as fish food, 46, 47. 



Platyphvlax maculipcnnis, 97, lOl, 



107, 109, 184, 197. 

 Plea striola, 76, 196. 

 Pleurocera, 140. 

 Pleuroceridfe, 148. 

 Pleuronectes platessa, 208. 

 PIcuroxus denticulatus, 103, 184, 



198. 

 Pleurobema clava, 140. 

 Plumatella punctata, 97, loi, log, 



146, 147, 184, 188. 

 Pohxentropid larvae, 97, 138, 184, 



196. 

 Polyzoa, 97, loi, 109. 

 Pomoxis sparoides, 220. 

 Pontederia cordata, 53, 58-60, 63- 



67, 71, 77, 80. 

 Pond-weed, 40, 47, 49, 51, 64, 75, 



79- 

 Pond-weed, clasping-leaf, 79. 

 Pond-weed, eel-grass, 79. 

 Pond-weed, floating, 64, 79. 

 Pond-weed, Fries', 79. 

 Pond-weed, leafy, 79. 

 Pond-weed, Richardson's, 79. 

 Pond-weed, Robbin's, 79. 

 Pond-weed, shining, 79. 

 Porifera, 92, 94, 97, loi, 103, 109, 



.205. 

 Potamogeton, 40, 47, 51, 53, 61, 64, 



70, 81, 129, 131, 152, 156, 157, 179. 

 Potamogeton foliosus, 51, 71, 79. 

 Potamogeton friesi, 51, 71, 79. 

 Potamogeton interruptus, 49, 51, 



60, 65, 66-72, 79, 119, 173, 176, 



178. 

 Potamogeton lucens, 49, 51, 60, 



65-72, 79- 

 Potamogeton natans, 49, 51, 58, 60, 



63. 65, 67, 79, 119, 121, 175, 177. 

 Potamogeton perloliatus, 49, 51, 



54, 58, 60, 63, 65-69, 72, 79, 119. 

 Potamogeton praelongus, 51, 68, 



69, 79- 



