Index. 
132 
Myrmarachne, 102 
Mysidacea, 38 
Mysis, 38 (fig.) 
Nauplius, 33 
Nebalia, 36 (fig.) 
Nematocarcinidae, 51 
Nematocarcinus, 52 (fig.) 
Nematos celis, 49 
Nephila, 97 
Nephrops, 54 (fig.) 
Nephropsidea, 53 
Neptunus, 71 
Nervous system of Crus- 
tacea, 19 
Northern Stone-Crab, 62 
Notaspis, 110 
Notostigmata, 109 
Notostraca, 26 
Nymphon, 116 
0 . 
Obisiidae, 106 
Obisium, 105 
Ocypoda, 74 
Ocypodidae, 74 
Ogygia, 78 (fig.) 
Oniscoidea, 43 
Oniscomorpha, 121 
Onychophora, 9, 118 
Opercular plates, 33 
Operculata, 33 
Opilioacaridae, 109 
Opilioacarus, 109 
Opiliones, 107 
Opisthophthalmns, 86 
Opisthosoma, 80 
Opisthothelae, 94 
Orb-webs, 97 
Orcliestia, 45 
Oribatidae, 110 
Ornithodoros, 111 
Ostracoda, 28 
Oviger, 116 
Oxyrbyncba, 24, 68 
Oxystomata, 66 
P. 
Paguridae, 60 
Paguridea, 60 
Paguropsis, 60 
Pagurus, 61 
Palaemon, 53 
Palaemonidae, 53 
Palamnaeus, 85 
Palinuridae, 56 
Pcilinurus, 56, 57 (fig.) 
Palp of Aracbnida, 81 ; of 
Crustacea, 17 
Palpatores, 108 
Palpigradi, 90 
Palpognatbs, 125 
Panctenodactyli, 105, 106 
Pandalidae, 52 
Pandalus, 52 
Pandinidae, 86 
Pandinus, 85, 86 
Pantopoda, 115 
Pcmulirus, 56 
Paraperipatus, 118 
Parasites, modifications 
caused by, 23 
Par ilia, 67 
Paromola, 66 
Parthenope, 70 
Parthenopidae, 10 j 
Pauropoda, 9, 123 
Pauropus , 124 (fig.) 
Pedipalpi, 87 
Pedunculata, 32 
Penaeidea, 51 
Penaeus, 50 (fig.), 51 
Pennella, 30 
Pentanymphon, 116 
Pentastomum, 117 (fig.) 
Peracarida, 38 
Pericardium of Crustacea, 
18 
Peripatopsis, 118 
Peripatus, 118 (fig.) 
Pbalangiidae, 108 
Phalangium, 108 
Philodrominae, 99 
Philomedes, 29 (fig.) 
Phosphorescence, 49, 51, 
59, 126 
Pbreatoicidea, 42 
Phronima, 47 
Phyllocarida, 36 
Phyllopoda, 25 
Phyllosoma, 58 (fig.) 
Pbytoptidae, 114 
Pill-Millipede, 121 
Pinnaxodes, 75 
Pinnotheridae, 75 
Planes, 74 
Plankton, 29 
Platydesmidae, 122 
Platydesmus, 122 
Platyonychus, 72 
Platyrrhachus, 123 
Pleopod, 15 
Pleurobrancbia, 17 
Pleuron, 14 
Plum mite, 115 
Podobranchia, 17 
Podocopa, 29 
Podogona, 106 
Podophthalmus, 72 (fig.), 75 
Podosomata, 115 
Poison-glands, 86, 91 
Poison-jaws, 125 
Poison of spiders, 98, 100 
Poliochera, 107 
Pollicipes, 32 
Polycheles, 59 (fig.) 
Polydesmoidea, 123 
Polydesmus, 123 
Polyxenidae, 121 
Polyxenus, 121 (fig.) 
Polyzonium, 122 
Porcelain Crab, 64 
Porcellana , 64 
Porcellanidae, 64 
Porcellio, 44 (fig.) 
Portunidae, 70 
Portunion, 44 
Portunus, 71 
Potamon, 72 
Potamonidae, 72 
Praeanaspides, 37 (fig.), 38 
Praegenital somite, 81, 105 
Prawn, 44, 51 ; common, 
53 (fig.) ; Dublin, 55 ; 
River-, 53 
Prosoma, 80 
Prosopon, 66 
Prosoponidae, 66 
Prostigmata, 111 
Protolycosa, 93 
Protopodite, 15 
Protective resemblance in 
Arachnida, 98, 99 ; in 
Crustacea, 24 
Psalmopoeus, 94 
Pselaphognatha, 120 
Pseudidiops, 95 
Pseudocarcinus, 23, 70, 71 
(fig-) 
Pseudoscorpiones, 104 
Psoroptes, 113 
Pterygotus, 84 
Pulmonary sacs, 91, 93, 94, 
96, 128 
Pycnogonida, 115 
Pycnogonum, 116 
Pygidium, 78 
R. 
Banina, 68 
Raninidae, 68 
Respiratory system of 
Arachnids, 80 
Bhagodes, 104 
Rhizocepbala, 35 
