31? 



Mussel, Duck, 193 



Pearl-bearing, 195 



shell, diagrams of, 189, 190 



Swan, 196 

 Mussels, 162, 187 

 Myosotis palustris, 75 

 Myriophyllum spioatum, 68 



N. 



Naidss, 276 

 Naid Worm, 276 

 Nauooris, 232 



cimicoides, 235 

 Nematoid Worms, 281 

 Nemura variegata, 258 

 Nepa, 232 



Nephelis ootooulata, 280 

 Nepidse, 232 

 NeritidaB, 168 

 Neritina fluviatilis, 169 

 Net for collecting, 37 



for transferring specimens, 40 



for water-worms, &c., 278 

 Neuroptera, 254, 258 

 Newt, Common Smooth, 98, 99 



Great Water, 98 



Palmated Smooth, 98, 100 



Straight-lipped Water, 98, 100 

 Newts, catching, 101 



metamorphoses of, 101 



their power of reproducing 

 lost limbs, 104 

 Nine-spined Stickleback, 148 

 Nitella, 89 



translucens, 89 

 Noterus, 202, 212 



orassicornis, 212 



semipunctatus, 212 

 Notonecta, 232 



glauca, 236 



maculata, 237 

 Notonectidse, 282, 236 

 Number of inmates, 47 



0. 



Object of the aquarium-keeper, 



1, 306 

 Oohthebius, 224 



Oohthebius pygmaus, 224 

 Orange-brown Hydra, 297 

 Orectochilus, 215 

 villosus, 218 

 Orfe, Golden, 134 

 Osphromenus Olfax, 159 

 Overcrowding, evils of, 47 

 Oviparous snails, 164 

 Ovoviviparous snails, 164 



P. 



Painting framework of aquaria, 



12, 14, 30 

 Palmated Smooth Newt, 98, 100 

 Paludina contecta, 168 



vivipara, 169 

 PaludinidsB, 168 

 Paradise Fish, 159 

 Parnidse, 225 

 Pamides, 225 

 PamuB prolifericornis, 225 

 Parrot-beaked Water-flea, 290 

 Pearl-bearing Mussel, 195 

 Peotini-branohiate snails, 164, 168 

 Pelobiides, 202 

 PelobiuB Hermanni, 212 

 Pennell, Mr. Cholmondeley, quoted, 



153, 195 

 Pentamera, 198 

 Petromyzon fluviatilis, 157 

 Perca fluviatilis, 135 

 Perch, Common, 135 

 Perenni-branchiata, 105 

 Perla bicaudata, 259 

 PerUdsB, 258 



Persicaria, Amphibious, 80 

 Phantom Larva, 264 

 Philhydrus, 223 

 Phryganea grandis, 243 



minor, 243 



obsoleta, 243 



striata, 243 

 PhryganeidsB, 242 

 Physa, 172, 178 



fontinalis, 179 



hypnorum, 164, 178 

 " Physician Fish," 128 

 Pickerel, 152 



