132 



Index. 



]\Iyr)iiaracluie, 102 

 Mysidacea, 38 

 Mysis, 38 (fig.) 



N. 



Nauplius, 33 

 Nebalia, 36 (fig.) 

 Nematocarcinidae, 51 

 Nematocarcimis, 52 (fig.) 

 Neniatoscelis, 49 

 Nephila, 97 

 Ncphrops, 54 (fig.) 

 Nephropsidea, 53 

 Neptunu8, 71 



Nervous system of Crus- 

 tacea, 19 

 Northern Stone-Crab, G2 

 Notasins, 110 

 Notostigmata, 109 

 Notostraca, 26 

 Nymplwn, 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 

 Opilioacariis, 109 

 Opilioncs, 107 

 OpistlioplithalmuH, 86 

 Opisthosoma, 80 

 Opisthothelae, 94 

 Orb-webs, 97 

 Orchcstia, 45 

 Oribatidae, 110 

 Ornithodoros, 111 

 Ostracoda, 28 

 Oviger, 116 

 Oxyrhyncha, 24, 68 

 Oxystomata, 66 



Paguridae, 60 

 Paguridca, 60 

 Paguropsis, 60 

 Pagurus, 61 

 Palacmon, 53 

 Palaemonidae, 53 

 Palamnacus, 85 

 J'aliuuridae, 56 



Palintivus, 56, 57 (fig.) 

 Palp of Arachnida, 81 ; of 



Crustacea, 17 

 Palpatores, 108 

 Palpigradi, 90 

 Palpognaths, 125 

 Pauctenodactyli, 105, 106 

 Paudalidae, 52 

 Pandalus, 52 

 Pandinidae, 86 

 Pandinus, 85, 86 

 Pantopoda, 115 

 Panulirus, 56 

 Paraperipatus, 118 

 Parasites, modifications 



caused by, 23 

 Parilia, 67 

 Paromola, 66 

 Parthenopc, 70 

 Partbenopidae, 70 

 Pauropoda, 9, 123 

 Paurojyus, 124 (fig.) 

 Pedipalpi, 87 

 Pedunculata, 32 

 Penaeidea, 51 

 Pcnaeus, 50 (fig.), 51 

 Pennella, 30 

 Pentanymphoii, 116 

 Pcntastomuni, 117 (fig.) 

 Peracarida, 38 

 Pericardium of Crustacea, 



18 

 Peripatopsis, 118 

 Pcripatiis, 118 (fig.) 

 Phalangiidae, 108 

 Plialangium, 108 

 Philodrominae, 99 

 Pliilumedes, 29 (fig.) 

 Phosphorescence, 49, 51, 



59, 126 

 Phreatoicidea, 42 

 Phronima, 47 

 Phyllocarida, 36 

 Phyllopoda, 25 

 Pliyllosoma, 58 (fig.) 

 Phytoptidae, 114 

 Pill-Millipede, 121 

 Pinnaxodes, 75 

 Pinnotheridae, 75 

 Planes, 74 

 Plankton, 29 

 Platydesmidae, 122 

 Platydesmus, 122 

 Platyonyclma, 72 

 Platyrrliachus, 123 

 Pleopod, 15 

 Pleurobranchia, 17 

 Pleuron, 14 

 Plum mite, 115 

 Podobranchia, 17 



Podocopa, 29 

 Podogona, 106 

 Podophtlialmus, 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 

 Polydesmns, 123 

 Polyxenidae, 121 

 Polyxenus, 121 (fig.) 

 Polyzonium, 122 

 Porcelain Crab, 64 

 Porcellana, 64 

 Porcellanidae, 64 

 Porcellio, 44 (fig.) 

 Portunidae, 70 

 Portimion, 44 

 Portunus, 71 

 Potamon, 72 

 Potamonidae, 72 

 Praeanaspides, 37 (fig.), 88 

 Praegenital somite, 81, 105 

 Prawn, 44, 51 ; common, 



53 (fig.) ; Dublin, 55 ; 



River-, 53 

 Prosoma, 80 

 Prosopon, 66 

 Prosopouidae, 66 

 Prostigmata, 111 

 Protolycosa, 93 

 Protopodite, 15 

 Protective resemblance in 



Arachnida, 98, 99 ; in 



Crustacea, 24 

 Psalmopoctis, 94 

 Pselaphognatha, 120 

 Pseudidiops, 95 

 Pseudocarcinus, 23, 70, 71 



(fig-) 

 Pseudoscorpiones, 104 



Pswoptes, 113 

 Ptcrygotus, 84 

 Pulmonary sacs, 91, 93, 94, 



96, 128 

 Pycnogonida, 115 

 Pycnogonum, 116 

 Pygidium, 78 



R. 



Banina, 68 

 Raninidae, 68 

 Respiratory system of 



Arachnids, 80 

 Rhagodcs, 104 

 Rhizocephala, 35 



