INDEX OF SUBJECTS. 



657 



231; Mollusca, 279; Myzostomeae, 

 244; Nematoda, 174; Nemertiua, 

 162; Pelecypoda, 383; Pentastomi- 

 dae, 461; Phorouidae, 247; Polyzoa, 

 255; Pycuogouida, 465; Rotifera, 

 191; Scaphopoda, 323; Tardigrada, 

 467; Tracheata, 471; Trematoda, 

 144; Turbellaria, 133, 135, 136, 138; 

 Urochorda, 622; Xiphosura, 430 



dimorphism, sexual, 193, 199, 241, 

 395, 496 



dimorphism, seasonal, 501. 



dissepiment, 107, 187, 202, 270 



dissogony, 123 



divisiou of labor, 85, 87, 91 (see also 

 polymorphism) 



docoglossate dentition, 306 



dorsal organ, 546 



dorsal pore, 219 



Echinococcus, 158 

 ectocyst, 255 

 ectoderm, 54 

 ectoplasm, 3 

 elaeoblast, 633 

 elytra, 490 

 embole, 54 

 encystment, 22, 36 

 endocyst, 255 

 endodenn, 54 

 endophragmal system, 375 

 endoplasm, 3 

 eudopodite, 373 

 eudosteruite, 429, 457 

 endostyle, Cephalocorda, 614, Uro- 

 chorda, 622 

 enteroccel, 57 

 ephippium, 391 

 EpJiyra, 103 

 epibole, 54 

 epipleural folds, 609 

 epipodite, 373 

 epipodium, 291 

 epistome, 247, 260. 597 

 epithelio-muscular cells, 80 

 Erichthus, 422 

 euconous eyes, 473 

 excretory system, Acanthocephala, 



181; Arn phi ue ura, 287, 292; Arach- 

 nida, 437; Brachiopoda. 272; Cepha- 

 locorda, 615; Cephalopoda, 353; 

 Cestoda, 155; Chsetopoda, 210, 222; 

 Crustacea, 38o; DinopMlus, 199; 

 Echiuodera, 185; Enteropneusta, 

 605; Gasteropoda, 302; Gasterotri- 

 cha, 196; Gephyrea, 239; Hirudinea, 

 235; Mollusca, 283; Myzostomeae, 

 245 ; Nematoda, 175; Nemertiua, 

 164; Pelecypoda, 337; Phorouidaj, 

 249; Platyhelminthes, 129; Poly- 

 zoa, 257, 260; Pterobranchia, 599, 

 600; Rotifera, 193; Scaphopoda,324; 

 Tracheata, 474; Trematoda, 145; 

 Turbellaria, 135, 138; Urochorda, 

 623; Xiphosura, 432 



exopodite, 373 



eyes Amphineura, 292 ; Arachnida, 

 438; Asteroidea, 559; Cepualochor- 

 da, 615; Cephalopoda, 351 ; Chaeto- 

 guatha, 188; Chaetopoda, 208; Crus- 

 tacea, 380; Gasteropoda, 301, 318; 

 Hirudinea, 234; Hydromedusae, 82; 

 Nemertina, 164; Pelecypoda, 335 ; 

 Pycnogonida, 465; Rolifera, 192; 

 Scyphomedusae, 99; Tracheata, 472; 

 Turbellaria, 131; Urochorda, 625; 

 Xiphosura, 431 



Fascioles, 574 

 fat-body, 492 

 flagellum, 28 

 flame-cell, 129 

 follicle-cells, 46 

 fossa rhomboidalis, 615 

 funiculus, 259 



Gasterozooid, 89 

 gastrula, 53 

 gemmation, 22 

 gemmules, 75 

 genital bursae, 561 

 germ-cell, 44 

 germ-layer, 54 

 Qlochidium, 339 

 Goette's larva, 141 

 gonopolyp, 85 



