376 



INDEX 



Cy there, 315 

 Cytherea, 224 



Dactylioceras, 276 



Dactylopores, 70 



Dactylozooid, 53, 71 



Dalmanella, 177 



Dalmanites, 307 



Daphnia, 312 



Decapoda (Cephalopoda), 281 

 ,, (Crustacea), 327 



Deiphon, 308 



Delthyrium, 161 



Deltidium, 164 



Deltoid plates, 151 



Demi-plates, 119 



Demospongiae, 40-44 



Dendrocrinus, 145 



Dendrograptus, 55 



Dendroid corals, 81 



„ graptolites, 55 



Dendrophyllia, 80, 104 



Dental plates, 162 



Dentalina, 17 



Dentalium, 257 



Dermal branchiae, 110 

 ,, layer (sponges), 31 



Desmas, 42 



Desmoceras, 287 



Desmodont, 204, 226, 230 



Development of graptolites, 61 

 ,, of corals, 79, 83 



,, of brachial skeleton, 



167 

 ,, of ammonoids, 270 



,, of trilobites, 300 



Dextral gasteropods, 233 

 Diademopsis, 133 

 Diastopora, 195 

 Dibranchia, 279 

 Dibunophyllum, 90 

 Dicellograptus, 68 

 Die eras, 221 

 Dichograptus, 67 

 Dicranograptus, 68 

 Dicroloma, 244 

 Dictyograptus, 55 

 Dictyonema, 55 

 Diet yophy ton, 39 

 Dictyothyris, 183 

 Dicyclic crinoids, 139, 142 

 Didymograptus, 67 



Dielasma, 183 

 Dimorphism, 19 

 Dimorphograptus , 69 

 Dimyaria, 200, 202, 209 

 Diplograptus, 68 

 Diplopoda, 332 

 Diplopodia, 128 

 Diprionidian = biserial, 58 

 Diptera, 336 

 Disc (Asteroidea), 107 



,, (Ophiuroidea), 112, 113 

 Discina, 172 

 Discinisca, 172 

 Discinocaris, 322 

 Discites, 265 

 Discitoceras, 265 

 Discoidal gasteropods, 236 

 Discoidea, 129 

 DiscomedussB, 73 

 Dissepiments, 79, 80, 82 

 Distal end, 57 

 Dithyrocaris, 322 

 Divaricator muscles, 165, 166 

 Dorsal cup, 137 



surface, 108, 201 

 Dory derma, 43 

 Dosinia, 224 

 Douvilleiceras, 287 

 Dragon-flies, 335 

 Dreissensia, 231 

 Dromia, 330 

 Dysodont, 203, 211, 229, 230 



Ears (Lamellibranchs), 205 

 Earwigs, 335 

 Ecardines, 170 

 Echinobrissus, 130 

 Echinocaris, 323 

 Echinoconus, 129 

 Echinocorys, 131 

 Echinocrinus, 125 

 Echinocyamus, 135 

 Echinocystis, 133 

 Echinoderma, 105-157 

 Echinognathus, 350 

 Echinoidea, 115-135 

 Echinosphara, 148 

 Echinothuria, 121 

 Echinus, 128 

 Ectocyst, 189 

 Ectoderm, 50, 70, 115 

 Ectoprocta, 191 



