INDEX 



519 



Cyrtia, 505 ; stratigraphical distribu- 

 tion, 507, 508 

 Cyrtoceras, 394 

 Cyrtodaria, 457 

 Cyrtodonta, 452 

 CyrtolUes, 407 

 Cyrtonotus^ 448 

 Cyrtotoma, 414 

 Cysticopsis, 346-351, 441 

 Cystiscus, 425 

 Cystopelta, 325, 326, 440 

 Cytherea, 454, 454 



Dacrydium, 449 



Daedalochila, 44I 



Dall, W. H., quoted, 35; on brancliiae, 

 164 



Damayantia, 440 



Daphnella, 4-26 



Darbyshire, R. D., on tenacity of life, 

 39 



Bardania, 415 



Dart-sac, 142 



Daiidebardia, 289, 292 f., 440 



Bavidsonia, 505, 508 



Dawsonella, 410 



Dayia, 505, 508 



Decapoda, 385 f . 



Decollation, 260 



Deep-sea Mollusca, 374 



De Folin, experiment on Cyclostoma, 

 157 



Deianira, 41O 



Delage, experimcDts on otoeysts, 197 



Delphinula, 409 



Deltidium, 499 



Dendronotus, 433 ; protective colora- 

 tion, 72 ; habits, 51 



Dentalium, 6, 444, 445 ; used as money, 

 97 ; veliger, 131 ; radula, 228 



Dentellaria, 350-355, 441 ; aperture, 63 



Desert species, 25, 85 



Deshayesia, 4II 



Desmoulea, 423 



Development of fertilised ovum. 130 f. 



Dexiohi-anchaea, 437 



Diadema, 414 



Biala, 415 



Dialeuca, 441 



Diaphora, 314 



Diaphorostoma, 412 



Diastema, 4I8 



Diastoma, 41'^ 



Diaulula, 434 



Dibaphus, 425 



Dibranchiata, 380 ; eye, 183 ; nervous 

 system, 207 



Diceras, 269, 455 



Didacna, 12, 297, 455 



Differences of sex, 133 



Dignomia, 511 



Digonopora, 134, 144 



Diloma, 4O8 



BimorpJioptychia, 4IO 



Dimya, 450 



Dinoholus, 504-, 508 



Dinoplax, 403 



Ditocardia, 9, 170, 405 f. 



Diplodonta, 452 



Diplommatina, 302-327, 413 



Diplomphalus, 322, 323, 440 



Diplopoma, 346, 351, 414 



Bipsaccus, 424 



Dipsas, 307 



Discina, 464, 468, 471, 475, 487 ; distri- 

 bution, 485 ; fossil, 493, 504 ; strati- 

 graphical distribution, 506, 508 



Discinidae, 487, 496, 504, 508, 511 



Discinisca, 487, 510 ; distribution, 485, 

 486 



Discites, 395 



Biscodoris, 434 



Discosorus, 394 



Distortio, 255 — see Persona 



Ditropis, 312, 314, 414 



Docoglossa, 227, 405 



Dolahella, 428, 431 



Dolahrifer, 431 



DoUum, 419 ; acid secretion, 237 



Donax, 269, 446, 453 



Dondersia, 404 



Dorcasia, 333, 44I 



Doridium, 430 



Doridunculus, 434 ', radula, 229 



Doriopsis, 434 



Boris, breathing organs, 159 ; radula, 

 230 



Dorsanum, 423 



Dosidicus, 390 



Dosinia, 454 



Doto, 433 ; protective coloration, 71 



Dreissensia, 14, 123, 452 ; hibernation, 

 26 ; singular habitat, 48 ; veliger, 

 132, 146 ; eyes, 192 



Dreissensiorniya, 452 



Drepania, 434 



Drillia, 426 



Drymaeus, 356, 442 



Dryptus, 356, 44I 



Durgella, 301, 304, 440 



Dwarf varieties, 88 



Dyhowskia, 290 



Eastonia, 454 



Ehurna, 267, 424 ; radula, 220 



Ecardines, 466 ; muscles, 476 ; fossil, 



493 ; families, 487, 503, 508 

 Eccyliomphalus, 413 

 Echinospira, 133 

 Edentulina, 338 

 Egg-laying of Arion,'i2 f.; of Mollusca 



generally, 123 

 Eglisia, 4II 

 Eider-duck, shells used by, 102 



