INDEX 



527 



Onchidiella, 443 



Onchidiidae, 245 ; radula, 234 ; anus, 



241 

 Onchidiopsis, 4II 

 Onchidium, 443; breathing, 163; eyes, 



187 

 Ondiidoris, radula, 230 

 Oiii.sria, 420 

 Onnho, 415 

 Onychia, 390 



Onychoteuthis, 390 ; clul>, 386 

 Oocorys, 4^0 

 Oopelfa, 329, 44O 

 Opcas, 442 

 Operculum, 267 f. 

 Ophidioceras, 247, 395 

 Ophileta, 413 

 Op is, 451 

 Oiiisthobranehiata, 4~7 ; defined, 9 ; 



warning, etc., colours, 71 f. ; generative 



organs, 144 ; breathing organs, 158 ; 



organs of touch, 178 ; parapodia, 199 ; 



nervous system, 203 ; radula, 229 

 Opisthcpoms, 266, 300, 314-316, 414 

 Opisthostoma, 248, 309, 413 

 Oppelia, 399 

 Orhicida, 464 

 Orbiculoidea, 504, 510 

 Orders of Mollusca, 5-7 

 Organs of sense, 177 

 Origin of land Mollusca, 11 f. 

 Ornithochiton, 403 

 Orphnus, 356, 44 J- 

 Orpiella, 440 

 Orthalicus, 342-358, 355, 442 ; habits, 



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



233, 234 

 Qrtliis, 505 ; stratigraphical distribution, 



506, 507, 511 

 Orthocems, 394, 394 

 Orthonota, 457 



Orthothetes, 505 ; stratigraphical distribu- 

 tion, 507, 508 

 Orygoceras, 247 

 Osphradium, 194 f. 

 Ostodes, 327 

 Ostracotheres, 62 



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

 Otina, IS, 439 

 OtiK'oncIia, 326, 440 

 Otocysts, 196 f., 197 

 Ot I pic lira, 422 

 OUpuma, 331, 338, 414 

 OtoHtumus, 353, 442 

 Ovary, 135 



Ovoviviparous genera, 123 

 Ovula, 419 ; protective coloration, 70, 75 ; 



radula, SO, 224 ; used as money, 97 

 Ovum, development of fertilised, 130 

 O.vychona, 358 

 Oxyijyrus, 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 . ; repro- 

 duction, 112 f. ; growth, 114 ; cookery, 

 114 ; poisonous oysters, 114 ; vision, 

 190 



Pacha^odus, 329-335, 441, 442 



Pachyhathron, 4'25 



Pachychilus, 354 



Pachydesmch crussatelloides, money made 



from, 97 

 Pachydomidae, 451 

 Pachydrooia, 307, 415 

 Pachylahra, 4I6 



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

 Pachyjjoma, 409 

 Pachystyla, 337, 440 

 Pachytyp)us, 451 

 Padollus, 407 

 Palaearctic region, 284 f. 

 Palaeoneilo, 44"^ 

 Palaeosolen, 457 

 Palaina, 327, 413 

 Palio, 434 



Pallial line and sinus, 270 

 Pcdlifera, 340, 44O 

 Palliobranchiata, 464 

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



vision, 184 ; P. vivipara, 24 — see also 



Viviparct 

 Paludomus, 332, 336, 338, 417 

 Panama, Mollusca of, 3 

 Panda, 322, 325, 335 

 Pandora, 458 

 Papuans, use of shells, 99 

 Papuina, 309, 319-324, 44I 

 Paramelania, 332 

 Paramenia, 404 



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

 Parastarte, 451 

 Parkinsonia, 398 

 Parmacella, 245, 291, 294 f., 438 n., 44O ; 



radula, 232 ; shell, 175 

 Pcmnacochlea, 322, 326, 44O 

 Parinarion, 309, 440 

 Parmdla, 326, 44O 

 Pa7'mophorns, 4O6 

 Parthena, 349-352, 350, 441 

 Parts of univalve shell, 262 ; bivalve, 269 

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

 Paryphanta, 321, 325, 44O 

 Paryphostoma, 415 

 PassamaicUa, 332 

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



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



anus, 241 ; kidneys, 242 ; shell, 262 ; P. 



ruhjata, veliser, 132 ; breathing organs, 



etc., 156, 157 

 Patelliform shell in various genera, 19 

 Paterina, 509, 510, 511 

 Patinella, radula, 227 



