INDEX OF SUBJECTS. 



Accessory intestine, Cephalocorda, 



605; Echinoidea, 579; Gephyrea, 



239; Polychseta, 207 

 Aconous eyes, 473 

 Actinotrocha, 249 

 adrectal gland, 305 

 adhesive cells, 123, 131 

 alar muscles, 470 

 albumiuiparous gland, 312 

 alternation of generations, 60; Cesto- 



da, 158; Hydromedusse, 96; Neraa- 



toda, 176; Scyphornedusse, 103; 



Trematoda, 148; Urochorda, 633 

 auiitosis, 9 



ametabolic insects, 499 

 amoeboid motion, 15 

 amphiaster, 11 

 amphidiscs, 76 

 ampulla, 537 

 antennary gland, 383 

 apical plate, 213, 607 

 archenteron, 54 

 archicerebrum, 379 

 Aristotle's lantern, 578 

 arthrobraucliia, 410 

 ascidiozooid, 632 

 Ascon, 70 

 aster, 7 

 atrium, 596; Cephalochorda, 612; En- 



teropueusta, 601 ; Pterobranchia, 



599, 600; Urochorda, 622 

 atrium (genital), 134 

 auriculae, 573 

 Auricularia, 590 

 avicularia, 262 

 axial sinus, 538 



Basement-membrane, 127 

 biogeuetic law, 143 



Bipinnaria, 559 



bivium, 572, 584 



blastocoel, 52 



blastopore, 54 



blastula, 52 



blood-vascular system, Arachnida, 437; 

 Cephalochorda, 611; Cephalopoda, 

 346; Chyetopoda, 206, 220; Crusta- 

 cea, 376; Enteropueusta, 603; Geph- 

 yrea, 238; Hirudiuea, 230; Mollusca, 

 278; Nemertina, 165; Phoronidae, 

 247; Tracheata, 470; Urochorda, 

 621; Xiphosura, 429 



Bo jauus, organ of, 337 



Brachiolaria, 559 



branchial heart, 347 



branchial skeleton, Cephalochorda, 

 613; Enteropneusta, 609 



brown body, 267 



brown canal, 616 



bursa copulatrix, Nematoda, 174, 182; 

 Tracheata, 497; Turbellaria, 136, 

 138 



byssus gland, 329 



Calamistrum, 449 

 calcar, 192 



calciferous glands, 220 

 calyptoblastic, 86 

 caryolymph, 6 

 caryoplasm, 5 

 cell, 4, 



cell-division, 9 

 cellulose, 30, 619 

 cenogenetic, 143 

 central capsule, 19 

 ceutrolecilhal, 53 

 centrosome. 7, 51 

 cephalization, 369. 



655 



