INDEX 



697 



Dendrochirotae, 652; 650 



Dendrocoelum lacteum, 203, 212, 212, 

 214 



Dendrocometes, 1 16 ; 33 n. ; paradoxus, 

 108 



Dendroid graptolites, 172 



Dendron, 137 



Dense nuclei, 23 



Dentalium, 572; 573 



Depression, 35 



Deraecoris fasciolus, 477 



Dermal layer, 117 



Dermaptera, 468 ; 429 



Dermis, 136 



Dermomuscular tube, 142 



Determinate cleavage, 145, 675 



Detorsion, 554 



Deutocerebrum, 310, 340 



Deutomerite, 95 



Development, 144. See also Embry- 

 ology, Larvae, Life cycle 



Diastylis, 395 ; stygia, 394 



Dibothriocephalus, 227, 228 ; latus, 

 227, 228, 230 



Dibranchiata, 588 



Dicranura, 490 



Dicyclical rotifers, 241 



Didymograptus , 171 ; 170, 172; affinis, 

 172; fasciculatuSy 172; v-fractus, 

 170 



Difflugia, 74; 12; urceolata, 74 



Digestion, 130; by Acarina, 534; by 

 Alcyonium, 183 ; by Arenicola, 273 ; 

 by Arthropoda, 314; by Aurelia, 

 175; by Coelenterata, 147; by 

 Crustacea, 344; by Daphnia, 367; 

 by Helix, 558-60; by Insecta, 434- 

 6; by Lamellibranchiata, 577-8; 

 by Oligochaeta, 287; by Ostrea, 

 586; by Physalia, 167; by Proto- 

 zoa, 19; by Rotifera, 240; by Tere- 

 do, 587; by Turbellaria, 206; by 

 Zoantharia, 189. See also Alimen- 

 tar>' canal. Circulation of food, 

 External digestion 



Digestive caeca, see Digestive gland 



Digestive gland, 130, 131; of Arach- 

 nida*, 517, 522, 529, 530; of 

 Brachiopoda, 616; of Mollusca*, 

 543, 558, 569, 577, 595- See also 

 Liver, Mesenteric caeca 



Digestive system, oi Alcyonium, 182; 

 of Aurelia, 174; of Ctenophora, 

 195, 196; of Medusae, 150; of 



Platyhelminthes*, 206, 213, 214, 

 216, 217, 223 ; of Zoantharia, 187. 

 See also Alimentary canal, Enteron 



Dimorpha, 83 ; mutatis, 84 



Dimorphic shells, 76 



Dinamoebidium, 55 



Dinobryon, 50; sertularia, 51 



Dinoflagellata, 54; 49, 50 n., 80 



Dinophilus 296 ; 294, 295 



Dinophysinae, 54 



Dinothrix, 55 



Diotocardia, 564; 552, 563 



Diphyllidea, 229 



Diphyes, 166 



Dipleurula, 631 ; 145, 627, 628 



Diploblastica, 129. See also Coelen- 

 terata 



Diplograptus, ly i;foliaceus, 171 



Diplomonadina, 65, 66, 67 



Diplopoda, 422 



Diplopores, 659 



Diploporida, 659 



Diplostraca, 362; 327, 354, 355 



Diplozoon, 218; 220 



Diptera, 504; 430, 508, 510 



Dipylidiu?n caninum, 228, 230 



Direct wing muscles, 430 



Directives, 187 



Discomedusae, 174 



Dissosteira Carolina, 440 



Distephanus, 50; speculum, 51 



Distomum macrostomum, 222 



Division of protozoan nuclei, 24 



Docoglossa, 563 



Dolichoglossus kozvalevskii, 663 



Doliolida, 686; 679, 682, 685 



Doliolum, 686 ; 677, 679, 684 



Donax, 578 



Doris, 569; 554, 567, 568 



Dorsal and ventral, 143; aspects of 

 bilateral animals, 143 ; aspects of 

 Ciiiata, 103; aspects of Holothu- 

 roidea, 649; aspects of Sepia, 591 ; 

 " blood vessels " of Echinoidea and 

 Holothuroidea, 629, 643, 650; 

 mesenteries of Alcyonaria, 182; 

 structures in radial animals, 143 



Dorsal antenna, 240 



Dorsal blood vessel, of Arthropoda, 

 see Aorta ; of Balanoglosstis, 667 ; 

 of Chaetopoda, 263, 275; of 

 Rhynchobdellidae, 299 



Dorsal "blood vessels" of Echino- 

 dermata, 629, 643, 650 



