INDEX. 



323 



Phacus, longicandus, 160 

 pleuronectes, 160 

 Philodina, 221, 230 



aculeata, 230 

 Phyllopoda, 262, 274 



branchial plates, 257, 



262 

 eggs, 263 



Entomostracaand, 257 

 eyes, 263 



key to genera, 264 

 literature, 278 

 to examine, 263 

 western, 2(13 

 Pilea pumila, epidermic crystals, 

 Pinnularia, gr, 96 [306 



major, 96 

 viridis, 96 

 Pisidium, 274 

 Planaria torva, 196 

 Plant crystals, 306 

 Plants, common aquatic, to 

 identify, 47, 50 



useful to microscopists, 



45 

 without English names, 46 

 Platycola, 148, 155 

 Pleurosigma, 91, 95 



angulatum, 95 

 Plumatella, 244, 247 

 Pocket-lens, combination, 3 



employment for, 3, 292 

 simple, 2 

 to focus, 7 

 Pollen, 303 

 Polyartha, 222, 235 

 Polyzoa, blood of, 242 



external structure, 238 

 food. 243 

 fresh-water, 237 



Polyzoa, habitat, 238 

 habits, '239 

 key to genera, 244 

 jelly-like loricsE, 240 

 literature, 256 

 lophophore, 241 

 mouth, 242 

 reproduction, 240, 252, 



254' 

 retraction and expan- 

 sion, 243 

 stomach, 242 



Polyzoa, tentacles, 239, 241,. 242 

 to examine, 243 

 tubular loricse, 241 



Poppy, seeds of, 304 



Portulaca, seeds of, 304 



sph^raphides, 306 



Potash crystals, chlorate of, 308 



Primrose, 306 



Prisms, long crystal, 306 

 short crystal, 307 



Pristina, 201, 202 



Probiscides of insects, 298 



Proserpinaca, 50 



Pseudopodia of Rhizopods, no 

 pin-like of Vampy- 

 rella, 114, 117 



Pterodina, 222, 234 



Pyrogallic acid, crystals, 308 



R 



Rabbit'sfoot (Trifoliumarvense), 



306 

 Ranunculus aquatilis, 47 

 Raphides, 306 

 Reflector for drajving the object, 



39 

 Rhizopods, 59, no 



