612 



INDEX. 



Plakopus, 11. 



Planaria, 210, 215. 218, 



221. 



Planaxis, 399. 

 Planocera, 222. 

 Planorbis, 321, 373, 414, 



416. 



Planorbulina, 14. 

 Planula, 124, 159. 

 Plasmodium, 15. 

 Platyaspis, 237. 

 Platycaulos, 183. 

 Platycotyle, 236. 

 Platydrilus, 511. 

 Platygorgia, 183. 

 Platyhelminthes, 209. 

 Platypoda, 397. 

 Platytheca, 30. 

 Platytrochus, 194. 

 Plaxipliora, 392. 

 Plectanium, 23. 

 Pleotanocotyle, 236. 

 Plectoidea, 23. 

 Plectonephric nephridia, 



498, 500. 

 Pleione, 480. 

 Pleionogaster, 510. 

 Pleistophora, 68. 

 Plerogyra, 195. 

 Pleroma, 94. 

 Plesiastraea, 196. 

 Plesioseris, 196. 

 Pleural ganglion, 319, 



331, 362. 



Pleurobrachia, 207. 

 Pleurobranchaea, 362, 



403, 409. 



Pleurobranchioidea, 408. 

 Pleurobranchus, 362,385, 



409. 



Pleuroceridae, 399. 

 Pleuroconcha, 326. 

 Pleurocorallium, 182. 

 Pleurocotyle, 235. 

 Pleuronema, 47. 

 Pleurophyllidia, 412. 

 Pleurostomella, 13. 

 Pleurotomaria, 361, 394. 

 Pleurotricha, 49. 

 Pleurotrocha, 309. 

 Plexaura, 183. 

 Pliobothrus, 129. 

 Pliodon, 347. 

 Plocamia, 96. 

 Ploeophysa, 153. 

 Ploima, 302, 308. 

 Pluinarella, 182. 

 Plumatella, 561, 568. 

 Plumolialichondria, 96. 

 Plumnlaria, 133. 

 Pneumadenia, 154. 



Pneumatocyst, 139. 

 Pneumatophore, 139. 

 Pneumatosac, 139. 

 Pneumoderma, 407, 408. 

 Pneumophysa, 155. 

 Pneumothyrae, 143. 

 Pocillopora, 195. 

 Podocoryne, 130, 131. 

 Podocyathus, 53. 

 Podolampas, 34. 

 Podophrya, 52, 53. 

 Podospfhgia, 97. 

 Podostoma, 11. 

 Poecillastra. 94 

 Polar-capsule, 66. 

 Policella, 181. 

 Poliopogon. 92. 

 Pollicita, 476. 

 Polyaraea, 196. 

 Polyarthra, 302, 309. 

 Polybostrichus, 471, 



476. 



Polycanna, 134. 

 Polycera, 412. 

 Polycelis, 210, 221. 

 Polychaeta, 458. 

 Polychoerus, 219. 

 Polycirrus, 465, 486. 

 Polyclada, 222. 

 Polycladus, 222. 

 Polyclonia, 167. 

 Polycolpa, 136. 

 Polycotyle, 238. 

 Polycyathus, 194. 

 Polycystidea, 59. 

 Polycystina, 22. 

 Polycyttaria, 22. 

 Polydinida, 35. 

 Polydiscus, 23. 

 Polydora, 472, 483. 

 Polyeunoa, 478. 

 Polygastric, 146. 

 Polygordius, 451, 452. 

 Polykrikos, 33, 35. 

 Polylophus, 92. 

 Polyrnastia, 97. 

 Polymastigina, 31. 

 Polymitus, 62. 

 Polymorphina, 14. 

 Polymorphism, 9, 121 ; 



of Polychaeta, 467. 

 Polymyaria, 276. 

 Polynoe, 467, 474, 478. 

 Polyodontes. 478. 

 Polyoeca, 33. 

 Polyophthalmus, 458, 



463, 472, 487. 

 Polyopis, 188 272. 

 Polyorchis, 134. 

 Polyp, 100 ; and Medusa, 



119 ; Anthozoan, 102. 



Polyp-head, 125. 

 Polyphragma, 491. 

 Polyphyes, 150. 

 Polyphyllia, 196. 

 Polyptde, 550. 

 Polypi mnaria, 133. 

 Poly podium, 123. 

 Polyrhabdus, 92. 

 Polyrlma, 167. 

 Polysiphonia, 188. 

 Polysiphonic, 125. 

 Polyspondylium, 18. 

 Polysporea. 61. 

 Polystomella, 15. 

 Polystomidium, 188. 

 Polystomum, 226, 236 



integeri'iinum, 227, 



228. 233. 

 Polythalamia, 11. 

 Polytoma, 29, 32. 

 Polytoreutus, 511. 

 Polytrema, 14. 

 Polytremacis, 177. 

 Polytrocha, 475. 

 Polyxenia, 136. 

 Polyzoa, 549. 

 Polyzoic, 60. 

 Pomatias, 398. 

 Pomatiopsis, 398. 

 Pomatoceros, 473, 491. 

 Pomatostegus, 491. 

 Pompholyx, 310. 

 Pompholyxophiys, 19. 

 Pond-snail, 415. 

 Pontobdella, 513, 518 



519, 521, 526 

 Pontodrilus, 510. 

 Pontogenia, 478. 

 Pontoscolex, 503, 506, 



511. 



Porella, 566. 

 Porifera, 72. 

 Porina, 566. 

 Poritella, 95. 

 Porites, 197. 

 Porodiscus, 23. 

 Poromya, 341, 342, 349. 

 Porosa, 193. 

 Porospora, 58, 59. 

 Porpalia, 144. 

 Porpema, 144. 

 Porpita, 144. 

 Porpitella, 144. 

 Porpitidae, 143. 

 Portellia, 480. 

 Portuguese man of war, 



154. 



Posteriodendron, 30 

 Potamides, 399. 

 Potamilla, 490. 

 Potamis, 490. 



