Pachycerca, 194 Paguri, 25 Pagurus Prideauxii, 26 Pandarus, 35 Parasites which undergo transmigration and metamorphosis, 183 ---- free in their youth, 138 ---- during their old age, 162 ---- without transmigration, 255 Pedicellina, 41, 42 Pediculinæ, 70 Peltogaster, 28, 60 Penella, 150 Pentastoma, 231 Philomedusa Vogtii on Halecampa, 61 Phoxichilidium, 35 Phthiriasis, 125 Phthirius pubis, 126 Phronima, 25 Phryxus paguri, 27, 145 ---- Rathkei, 145 Phylliroë bucephala, 61 Phyllobothrium of the Dolphin, 207 Phylloxera vastatrix, 166 Physalia, 9 Picnogonon, 34 Pilot, 10 Pinnotheres, 18 Pisa Styx, 20, 61 Piscicola, 113 Planaria, 46 273 Platygaster cyamus, 171 Platystoma, 7 Plover, Egyptian, Introd. xvi., 107 Polia involuta, 46 Polynema, 169 Polynoë, 43 Polyp of the Sterlet, 82 Polystomum integerrimum, 261 ---- ocellatum, 261 Polythoa, 64 ---- of the Adriatic, 63 Pontobdellæ, 80, 111 Pontonia, 18 Porcellanæ, 21 Porites, 62 Praniza, 75 Premnas biaculeatus, 7 Prosthetes cannelatus, 27 Protolepas, 60 Psorospermiæ, 161 Pteroptus, 123 Pulex penetrans, 141 ---- irritans, 128 Pylidium, 45 Pyrgoma, 60 Reduvius personatus, 267 Remora, 11 Rhabdites, 156 Rhagio, 119 Rhipiptera, 257 Rhincoprion penetrans, 141 Ricini, 69, 72 Rictularia plagiostoma, 251 Rouget (Cheyletus eruditus), 137 Sabelliphilus, 152 Sacculina, 59 Saphirina, 77 Sarcoptes mutans, 135 ---- scabiei, 131 Scalpellum, 56, 60 Sclerostomum equinum, 238 ---- pinguicola, 238 Scolyti, 168 Scison nebaliæ, 36 Simonea folliculi, 89, 134 Simulium molestum, 119 Siponculus concharum, 47 Sertularia parasitica, 63 Serupocellariæ, 61 Sitaris, 172 Smut in Corn, 181 Snail and Drilus, 13 Spiroptera obtusa, 246 Sphex, 170 Sphærosoma of Leydig, 74 Sphæronella Leuckarti, 151 Sphærulariæ, 235 Sphyriones, 151 Sphynx of Tithymalis, 166 Spirorbis, 44 Staurosoma on Sabella, 35 Stegophilus insidiatus, 8, 9 Sterlet, 82 Stephanurus dentatus, 238 Stratiome chameleon, 177 Strebla vespertilionis, 175 Strepsiptera, 256 Stronguli, 238 ---- of Porpoise, 239 Strongulus trigonocephalus, 240 ---- armatus, 93 ---- commutatus, 239 ---- filaria, 237 ---- gigas, 239 Stylifer, 36 Stylops, 256 Stylorhynchus oligacanthus, 161 Sylon hippolytes, 60 ---- Pandali, 60 Syngamus trachealis, 91 Syrphus, 122