INDEX 



527 



Omphalotropis, 306, 309, 316, 324, 327, 

 338, 414 



Onchidiella, 442 



Onchidiidae, 245 ; radula, 234 ; anus, 

 241 



Onchidiopsis, 4II 



Onchidium, 443 ; breathing, 163 ; eyes, 

 187 



Onchidoris, radula, 230 



Oniscia, 420 



Onoha, 415 



Onychia, 390 



OnycJioteuthis, 390 ; club, 386 



Oocorijs, 420 



Oopelta, 329, 440 



Opeas, 442 



Operculum, 267 f . 



Ophidioceras, 247, 395 



Ophileta, 413 



Op is, 451 



Opisthobranchiata, 427 ; defined, 9 ; 

 warning, etc., colours, 71 f. ; genera- 

 tive organs, 144 ; breathing organs, 

 158 ; organs of touch, 178 ; parapodia, 

 199 ; nervous system, 203 ; radula, 229 



Opisthoporus, 266, 300, 314-316, 414 



Opisthostoma, 248, 309, 413 



Oppelia, 399 



Orhicula, 464 



Orbiculoidea, 504i 510 



Orders of Mollusca, 5-7 



Organs of sense, 177 



Origin of land Mollusca, 11 f. 



OrnitliocMton, 403 



Orphnus, 356, 44I 



Orpiella, 440 



Orthalicus, 342-358, 355, 44^ ; habits, 

 27 ; variation, 87 ; jaw, 211 ; radula, 

 233, 234 



Orthis, 505; stratigraphical distribu- 

 tion, 506, 507, 511 



Orthoceras, 394, 394 



Orthonota, 457 



Orthothetes, 505; stratigraphical dis- 

 tribution, 507, 508 



Orygoceras, 247 



Osphradium, 194 f. 



Ostodes, 327 



Ostracotheres, 62 



Ostrea, 252, 258, 446, 449 ; intestine, 241 



Otina, 18, 439 



Otoconcha, 326, 440 



Otocysts, 196 f., 197 



Otopleura, 422 



Otopoma, 331, 338, 414 



Otostomns, 353, 442 



Ovary, 135 



Ovoviviparous genera, 123 



Ovula, 419 ; protective coloration, 70, 

 75 ; radula, 80, 224 ; used as money, 97 



Ovum, development of fertilised, 130 



Oxychona, 358 



Oxygyrus, 422 ; foot, 200 

 Oxynoe, 432 ; radula, 230 

 Oyster-catchers, shells used by, 102 

 Oyster, cultivation, 104-109 ; living 



out of water, 110; enemies, 110 f.; 



reproduction, 112 f . ; growth, 114, 



cookery, 114; poisonous oysters, 



114 ; vision, 190 



Pachnodus, 329-335, 441, 442 



Pachyhathron, 425 



Pachychilus, 354 



Pachydesma crassatelloides, money 



made from, 97 

 Pachydomidae, 451 

 Pachydrobia, 307, 415 

 Pachylabra, 4I6 



Pachyotus, 334, 336, 355, 358, 44I 

 Pachypoma, 409 

 Pachystyla, 337, 440 

 Pachytypiis, 451 

 Padollus, 407 

 Palaearctic region, 284 f. 

 Palaeoneilo, 447 

 Palaeosolen, 457 

 Palaina, 327, 413 

 Palio, 434 



Pallial line and sinus, 270 

 Pallifera, 340, 440 

 Palliobranchiata, 464 

 Paludina, 4I6 ; penis, 136 ; eye, 181 , 



vision, 184; P. vivipara, 24 — see 



also Vivipara 

 Paludomus, 332, 336, 338, 417 

 Panama, Mollusca of, 3 

 Panda, 322, 325, 335 

 Pandora, 458 

 Papuans, use of shells, 99 

 Papiiina, 309, 319-324, 441 

 Paramelania, 332 

 Paramenia, 404 



Parasitic worms, 60 f . ; Mollusca, 74 f . 

 Parastarte, 451 

 Parkinsonia, 398 

 Parmacella, 245, 291, 294 1, 438 n., 



440 ; radula, 232 ; shell, 175 

 Parmacochlea, 322, 326, 440 

 Parmarion, 309, 440 

 Parmella, 326, 440 

 Parmophorus, 4O6 

 Parthena, 349-352, 350, 44I 

 Parts of univalve shell, 262 ; bivalve, 



269 

 Partula, 319-327, 326, 442; radula, 233 

 Paryphanta, 321, 325, 440 

 Paryphostoma, 415 

 Passamaiella, 332 

 Patella, 405, 464 ; as food, 56 f . ; eye 



182 ; radula, 214, 215, 227 ; crop, 238 



anus, 241 ; kidneys, 242 ; shell, 262 



P. vulgata, veliger, 132 ; breathing 



organs, etc., 156, 157 



