INDEX 



637 



Cystoidea, 580, 597 f. 



Cytogamy, 33 f. 



Cytoplasm, 6 ; of ovum of Sea-urchin, 7 ; 



granular, nutritive, of muscle cell, 19 ; 



in cell-division by mitosis, 26 f. ; during 



syngamy, 34 



Dactylo-imtra, 311, S$S ; D. lactea, 312 

 Dactylopores, 257 



Dactylozooids, 264 ; of Hydractinia, 264 ; 

 of Millepora, 269 ; of Siphonophora, 299 

 Dale, on chemiotaxy, 22 

 Dallinger, W. H. , and Drysdale, C, on 

 Protozoa, 44, 45 ; on organisms of putre- 

 faction, 44, 116 f. ; on life-histories of 

 Flagellates, 116 f. 

 DaUingeria, 111, 112, 119 ; anchoring 

 flagella of, 114 ; D. drysdali, gametes 

 of, 116 n. 

 Dalyell, 317 n., 375 



Dangeard, on brood- division in active 

 Chlamydomonadidae, 115 ; on Plagel- 

 lata, 119 n. 

 Dantec, Le, on protoplasmic movements, 

 16 n. ; on peptic digestion in Protozoa, 16 

 Darwin, 328 n., 360, 391 

 Darwinella^ 221 

 Dasygorgiidae, 333 ( = Chrysogorgiidae, 



355) 

 Davenport on protoplasmic movements, 



16 n., 19 n. 

 Dawydoff, 423 

 Dead men's fingers [ = Alcyonium digita- 



tum, 349) 

 Death, 11 ; by diffluence, granular disin- 

 tegration or solution, 14 f. ; by desolu- 

 tion, 15 ; necessary, of colonial cells of 

 Volvox, 128 ; in Volvox and in Metazoa, 

 compared, 130 

 Deep-sea deposits (Foraminifera), 70 

 Degen, on functions of contractile vacuole, 



15 n. 

 Degeneration, senile, among Ciliata, 148 

 Deglutition in Podophrya trold, 159 — see 



also Ingestion of food 

 Deiopea, 419 

 Deiopeidae, 4.Z9 



Delage, on protoplasm, 3 n. ; on syngamy, 

 34 n. ; on motion of flagella, 114 n. ; 

 on Sponges, 168, 174, 226 ; and 

 Hirouard, on Protozoa, 46 

 Delap, M. J., 311 n. 

 Deltoid plate of Blastoidea, 599 

 Demospongiae, 195, 209 f. 

 Dendoryx, 224 

 Dendrite, 444 

 Bendrobrdchia, 409 

 Dendrobrachiidae, 409 

 Dendroceratina, 209, SW, 221 

 Dendrochirota, 568, 569, S7S, 577, 578 

 Dendrocometes, 169, 160, 161 f. 

 Dendrograptidae, ^Sl 



Dendrograptus, 281 



Dendrophyllia, 4^4 



Dendy, 188 n., 192, 274, 275 



DepastreUa, 321 



Depastridae, 320, S21 



Depastrum cyathifor'me, 321 



Depressor muscles of compasses of Echinus 



escuhntus, 527 

 Dercitus bucklandi, 221 

 Dermal, gill — see Papula ; membrane, 170 

 Dermalia, 201 

 Detinasterias, Jfll 

 Desma (the megasclere which forms the 



characteristic skeletal network of the 



Lithistida, an irregular branched spicule), 



215, 224 

 Desmacella, 224 

 Besmacidon, 222 

 Des-mophyes, 307 

 Desmophyinae, 307 

 Desmothoraca, 71 

 Desolution of protoplasm, 11 f. 

 Deutomerite, 98 

 Development, of Sponges, 226 ; of 



Scyphozoa, 316 ; of Alcyonaria, 341 ; 



of Zoantharia, 373 ; of Echinodermata, 



601 f. 

 Dextrin, 15 



Diadematidae, 531, 532, S38 f., 658 

 Diadematoid type of ambulacral plate, 



531, 539 

 Dialytinae, 192 

 Diancistra (a spicule resembling a stout 



Sigma, but the inner margin of both 



hook and shaft thins out to a knife edge 



and is notched), 222 

 Diaphorodon, 59 ; shell of, 60 

 Diaseris, 4O4 ; asexual reproduction, 388 

 Diatomaoeae, skeleton of, 84 ; symbiotic 



with CoUosphaera, 86 

 Diatomin, 86 ; (?) in coloured Flagellates, 



115 n. 

 Dichoporita, 598, 599 

 Dicoryne, 268, 270 

 Dictyoceratina, S20 

 Dictyocha, 110 

 Dictyochida ( = Silicoflagellata, 110), 79; 



in Phaeocystina, 86 f. 

 Dictyocystis, IS" ; test of, 152 

 Dictyonalia, 201 

 Dictyoneina, 281 

 Dictyoniua, 202 

 Dictyostelium, 90 

 Dicyclica, 594 

 Dicymia, 308 

 Dicystidae, 97 



Didinium, 137 ; trichocysts of, 143 

 Didymium, 90 ; D. difforme, 92 

 Didymograptus, 282 

 Diffluence, 14 f. 

 Diffiugia, 5"2 ; D. pyrif minis, 55 ; test of, 



56 



