INDEX 



519 



Cyrtia, 505 ; stratigrapliical distribution, 



507, 508 

 Cyrtoceras, 394 

 Cyrtodaria, 4^7 

 Cyrtodonta, Jf52 

 Cyrtolites, 407 

 Cyrtomitus, 44^ 

 Cyrtotoma, 4^4 

 Cysticopsis, 346-351, 44I 

 Cystiscus, 425 

 CystopeUa, 325, 326, 44O 

 Cytherea, 454, 454 



Dacrydium, 449 

 Daedalochiln, 44^ 

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



164 

 Damayantia, 440 

 DcqihneUa, 4^6 

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



39 

 Dardanin, ^7.5 

 Dart-sac, 142 



Daudebardia, 289, 292 f., 440 

 Davidsonia, 505, 508 

 DmiismieUa, 4IO 

 Lkiyia, 505, 508 

 Decapoda, 3S5 f. 

 Decollation, 260 

 Deep-sea MoUusca, 374 

 De Folin, experiment on Cyclostnvia, 157 

 Dcianira, 4IO 



Delage, experiments on otocysts, 197 

 Delphinv.la, 409 

 Deltidium, 499 

 Deudronotus, 433 ; protective coloration, 



72 ; habits, 51 

 Dentalium, 6, 444, 44-5 ; used as money, 



97 ; veliger, 131 ; radula, 228 

 Dentellaria, 350-355, 441; aperture, 



63 

 Desert species, 25, 85 



Dcfihayesia, 4II 



Be.wioidea, 423 



Development of fertilised ovum, 130 f. 



Dexiobranchaea, 437 



Diademn, 414 



Diala, 415 



Dialeuca, 441 



Diaphora, 314 



J)wph<yrostoma, 41^ 



Diastema, 41S 



Dmstonm, 417 



D ''Aihda, 434 



Dtb(i])hvs, 4~o 



Dibranchiata, 3S0 ; eye, 183 ; nervous 

 system, 207 



Dirrras, 269, 455 



Didorna, 12, 297, 455 



Differences of sex, 133 



Diifnvmiii, 511 



Digonopora, 134, 144 



Diloma, 4O8 



Dimorphoptychia, 4IO 



Dimya, 450 



Dinobolus, 504, 508 



Dinopjlax, 403 



Diotocardia, 9, 170, 405 f. 



Diplodonta, 452 



Diplommatina, 302-327, 413 



Diplomphalus, 322, 323, 44O 



Liplrqxnna, 346, 351, 414 



Dipsaccus, 424 



Dipsas, 307 



Discina, 464, 468, 471, 475, 4S7 ; distri- 

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

 graphical distribution, 506, 508 



Discinidae, 487, 496, 504, 508, 511 



Discinisca, 437, 510 ; distribution, 485, 

 486 



Disci tes, 395 



Discodoris, 434 



Discosorus, 394 



Distortio, 255 — see Persona 



Ditropis, 312, 314, 414 



Docoglossa, 227, 405 



Dolabella, 428, 431 



Dolabrifer, 431 



Dolium, 419 ; acid secretion, 237 



Donax, 269, 446, 4-53 



Dondersia, 404 



Dorcasia, 333, 441 



Doridium, 430 



Doridtmculus, 434 ', radula, 229 



Doriopsis, 434 



Doris, breathing organs, 159 ; radula, 

 230- 



Dorsanum, 4~3 



Dosidicus, 390 



Dosinia, 454 



Doto, 433 ; protective coloration, 71 



Dreissensia, 14, 123, 452 ; hibernation, 

 26 ; siiigular habitat, 48 ; veliger, 132, 

 146 ; eyes, 192 



D re issens io m ya , 452 



Drepania, 434 



Drillia, 42G 



Drymaeus, 356, 44^ 



Driy2)tus, 356, 441 



Durgella, 301, 304, 44O 



Dwarf varieties, 88 



Dybowskia, 290 



Eastonia, 454 



Kbiirna, 267, 4~4 ', radula, 220 



Ecardines, 466 ; muscles, 476 ; fossil, 



493 ; families, 487, 503, 508 

 Eccyliomphalus, 413 

 Erhinospira, 133 

 EdentuUna, 338 

 Egg-laying of Arion, 42 f. ; of Mollusca 



generallv, 123 

 Eijlisiu, 411 

 Eider-duck, shells used by, 102 



