INDEX OF SUBJECTS. 



Accessory intestine, Cephalocorda, 



605; Echinoidea, 579; Gephyrea, 



239; Polychseta, 207 

 Aconous eyes, 473 

 AcUnotrocha, 249 

 adrectal gland, 305 

 adhesive cells, 133, 131 

 alar muscles, 470 

 albuminipavous gland, 313 

 alternation of generations, 60; Cesto- 



da, 158; Hydromedusse, 96; Nema- 



toda, 176; Scyphomedusae, 103; 



Trematoda, 148; Urochorda, 633 

 aniitosis, 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 

 arthrobranchia, 410 

 ascidiozooid, 633 

 Ascon, 70 

 aster, 7 

 atrium, 596; Cephalochorda, 613; En- 



teropneusta, 601 ; Pterobranchia, 



599, 600; Urochorda, 633 

 atrium (genital), 134 

 auriculae, 573 

 Auricularia, 590 

 avicularia, 363 

 axial sinus, 538 



Basement-membrane, 137 

 biogenetic law, 143 



Bvpinnaria, 559 



bivium, 572, 584 



blastocoel, 52 



blastopore, 54 



blastula, 52 



blood-vascular system, Arachnida, 437; 

 Cephalochorda, 611; Cephalopoda, 

 346; Chsetopoda, 206, 230; Crusta- 

 cea, 376; Enteropneusta, 608; Geph- 

 yrea, 238; Hirudinea, 330; MoUusca, 

 378; Nemertina, 165; Phoronidse, 

 247; Tracheata, 470; Urochorda, 

 621; Xiphosura, 429 



Bojanus, 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, 339 



Calamistrum, 449 

 calcar, 193 



calciferous glands, 320 

 calyptoblastic, 86 

 caryolymph, 6 

 caryoplasm, 5 

 cell, 4. 



cell-division, 9 

 cellulose, 30, 619 

 cenogenelic, 143 

 central capsule, 19 

 centrolecithal, 53 

 centrosome, 7, 51 

 cephulization, 369. 



655 



