INDEX OF SUBJECTS. 



657 



231; Mollusca, 379; Myzostomeae, 

 244; Nematoda, 174; Nemeitiua, 

 162; Pelecypoda, 333; Pentastomi- 

 dse, 461; Phoronidae, 247; Polyzoa, 

 255; Pycuogouida, 465; Rotifera, 

 191; Scaphopoda, 823; 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, 303, 270 



dissogony, 183 



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

 polymorphism) 



docoglossate dentition, 306 



dorsal organ, 546 



dorsal pore, 319 



Echinocoecus, 158 

 ectocyst, 255 

 ectoderm, 54 

 ectoplasm, 3 

 elseoblast, 633 

 elytra, 490 

 embole, 54 

 encystment, 22, 36 

 endocyst, 255 

 endoderm, 54 

 endophragmal system, 375 

 endoplasm, 3 

 endopodlte, 373 

 endosternite, 429, 457 

 endostyle, Cephalocorda, 614, Uro- 

 chorda, 622 

 enterocoel, 57 

 ephippium, 391 

 Ephyra, 103 

 epibole, 54 

 epipleural folds, 609 

 epipodite, 373 

 epipodium, 291 

 epistome, 347, 360, 597 

 epithelio-muscular cells, 80 

 BricMlius, 433 

 euconous eyes, 473 

 excretory system, Acanthocephala, 



181; Amphineura, 387, 393; Arach- 

 nida, 437; BracLiopoda, 373; Cepha- 

 locorda, 615; Cephalopoda, 353; 

 Cestoda, 155; Chaetopoda, 210, 223; 

 Crustacea, 383; DinophUiis, 199; 

 Echinodera, 185; Enteropueusta, 

 605; Gasteropoda, 302; Grasterotri- 

 cha, 196; Gephyrea, 339; Hirudinea, 

 335; Mollusca, 383; Myzostomese, 

 345 ; Nematoda, 175; Nemertiiia, 

 164; Pelecypoda, 337; Phoronidae, 

 349; Platyhelminthes, 139; Poly- 

 zoa, 357, 260; Pterobranchia, 599, 

 600; Rotifera, 193; Scaphopoda,334; 

 Tracheata, 474; Trematoda, 145; 

 Turbellaria, 135, 138; Urochorda, 

 623; Xiphosura, 432 



exopodite, 373 



eyes — Amphineura, 293 ; Arachnida, 

 438; Asteroidea, 559; Cephalochor- 

 da, 615; Cephalopoda, 351; Chseto- 

 gnatha, 188; Chaetopoda, 208; Crus- 

 tacea, 380; Gasteropoda, 301, 318; 

 Hirudinea, 234; Hydromedusse, 83; 

 Nemertina, 164; Pelecypoda, 335 ; 

 Pycnogonida, 465; Rotifera, 192; 

 Scyphomedusae, 99; Tracheata, 473; 

 Turbellaria, 131; Urochorda, 625; 

 Xiphosura, 431 



Fascioles, 574 

 fat-body, 493 

 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 

 OlocMdium, 339 

 Goette's larva, 141 

 gonopolyp, 85 



