202 



INDEX 



nervous system of Trema- 

 todes, 84 



Triclads, 26 

 Neumann, 131 

 neuro-glandular pit, 184 

 Niemec, 96, 110 

 Nitzsch, 48, 74, 89 

 Nitzschia, 50, 83 

 Nordmann, v., 48 

 Notocotyle, 69 



Octobothrium, 50 

 Octocotylinae, 50 

 Oersted, 8, 160, 161 

 Oerstedia, 171, 173 

 cesophageal nerves, 195 

 Ogmogaster, 69 

 Oligocdis, 24 

 Oligodadus, 31, 35 

 Omalostoma, 9 

 Onchobothrium, 119 

 Onchocotyle, 52, 79 

 onchosphere, 111 (footnote), 



113, 137 



ootype, 37, 55, 86, 99 

 Ophryocotyle, 128 

 Opisthotrema, 69, 88 

 Opistoma, 10 

 oral sucker, 79 

 Orthonectida, 153 

 Orthotropous calotte, 150 

 Orygmatobothrium, 119 

 Othelosoma, 25 

 Otobothrium, 125 

 otocyst, 16 

 Otomesostoma, 9 

 Otoplana, 24 

 Otoplanidae, 7 



diagnosis, 24 

 Ototyphlonemertes, 170, 186 

 Ototyphlonemertidae, 159, 



173 



diagnosis, 170 

 Otto, 89 

 Oudemans, 161 



ovary in Gyrodactylus, 53 



in Turbellaria, 21 

 Oxypolia, 194 



paedogenesis, 76 

 Pagenstecher, 48, 157 

 Palaeonemertini, 161, 170 

 Pallas, 65, 94, 96 

 Paludicola, 24 

 papillae, adhesive, 79 

 Paranemertes, 194 

 paranucleus (Dicyemid), 



152 

 parapolar cells (Dicyemid), 



150 

 Parapolia, 194 



Parasitica, 10 



parasitic Nemertines, 173 



Turbellarians, 14 



worms, 49 

 parasitism, 77, 89 

 Parataenia, 133 (footnote) 

 parenchyma in Cestodes, 



107 



in Polyclads, 33 



in Khabdocoels, 14 



in Trematodes, 83 



in Triclads, 26 



digestive, in Acoela, 

 15 



Parona, 48 

 parthenogenesis, 76 

 Pectobothrii, 49, 50 

 Pelagonemertes, 171, 173, 



184 

 Pelagonemertidae, 159 



diagnosis, 171 

 Pelichnibothrium, 119 

 Pelmatoplana, 25 

 Pdtidocotyle, 119 

 Pelyonchobothrium, 119 

 Peminatodiscus, 158 

 penis, 36, 85 

 Perocephalus, 25 

 Perrier, 101, 144, 145 

 Perugia, 48 

 Phagocata, 24 

 pharynx bulbosus, 17 



plicatus, 18 

 pharynx, in Polyclads, 33 



in Khabdocoels, 17 



in Trematodes, 83 

 - in Triclads, 18, 26 

 Philippi, 44 

 Phoeuicurus, 48 

 Phoreiobothrium, 119 

 Phyllacanthinae, 119 

 phyllidium, 115, 120, 127 

 Phyllobothrinae, 119 

 Phyllobothrium, 119, 121, 



122 



Phyllonella, 50 

 Phyllorhyncha, 125 

 pilidium, 161, 163 

 Pintner, 96, 101 (footnote), 



108, 115, 121, 127, 132 

 Placocephalus, 25, 26 

 Plagioplana, 31 

 Plagiostoma, 10, 12, 14 

 Plagiostomidae, 6, 17 



diagnosis, 10 

 Plagiostominae, 10 

 Plagiotaenia, 131 

 plagiotropous calotte, 150 

 Planaria, 7, 21, 24, 25, 



28, 30, 66, 160 

 Planariidae, 7 



Planariidae, diagnosis, 24 

 Planknoplana, 3.1 

 Planocera, 31, 37, 38 

 Planoceridae, 7 



diagnosis, 31 

 plasmatic canal, Sommer's, 



108 (footnote) 

 plasinodial tubes, 155 

 Platyelmia, 2 

 Platyelminthes, 2 

 Platyhelmia, 2 



characters of, 3 

 Plathelminthes, 1 (footnote) 

 Platner, 96 



Platodes, 2 



Platyaspis, 60 



Platybothrium, 119, 122 



Platydemus, 25 



Platyhelmiuth, ideal ances- 

 tral, 3 



Plectanocotyle, 52 



plerocestoid, 114 



Podocotyle, 67 



Poirier, 96 



polar cap, 149 



Poliopsis, 172 



Polycelis, 24, 28 



polycercus, 142 



Polychaerus, 10, 23 (foot- 

 note) 



Polyclada, 8 



Polycladida, 1, 7, 12, 

 90 



anatomy, 31-38 



development, 38 



diagnosis and classifica- 

 tion, 31 



Polycladus, 25 

 Polycotyle, 69 

 Polypocephalus, 133 (foot- 

 note) 



Polyporus, 31 

 Polypostia, 31, 36 

 Polypostiidae, 7 



diagnosis, 31 

 Polystomea, 49, 50 

 Polystomidae, 47, 80 



diagnosis, 50 

 Polystominae, 52 

 Polystomum, 47, 52, 55, 78, 



83, 86 

 Proboscidae, 6, 17 



diagnosis, 9 

 proboscis, 162, 176, 178, 



195 



sheath, 179 



Turbellariurn, 17 



Tetrarhynchus, 127, 133 



use of, 179 

 Procerotidae, 7 



diagnosis, 24 



