6l2 



INDEX 



Artery, Antennary, 370; Cephalic, 

 378; Gastrointestinal, 505; 370; 

 Hepatic, 505 ; Lateral, 450, 458 ; 

 Pallial, 505; Sternal, 370; Supra- 

 neural, 450, 457; Terminal, 505. 

 See also Aorta, Anterior aorta, 

 Posterior aorta 



Arthrobranchiae, 361 



Arthropoda, 270; i, 2, 281 



Articulamentum, 475 



Ascaris, 215; 216, 218, 219 



A. lumbricoides , 222 



Ascidia, 602 



Ascidiacea, 602; 601 



Ascidiae compositae, 602 



Ascidian tadpole, 597 ; 598 



Ascon grade, 113 



Ascopus, 212 n. 



Ascothoracica, 347 



Asellus, 356; 100, 298 



A. aquaticus, 357 



Asexual reproduction, of Metazoa, 

 see Budding, Strobilization ; of 

 Porifera, 116; of Protozoa, see 

 Agamogony, Schizogony, Sporo- 

 gony ; of Turbellaria, 188 



Aspidobranchiata, see Diotocardia 



Aspidochirotae, 575 



Aspirigera, see Holotricha 



Asplanchna, 213 



Astacura, 362 



Astacus, 362 ; 279, 296, 302, 304, 304, 

 306, 308, 310, 365 



A.fluviatilis, 313, 315, 363 



Asterias, 561 ; 558, 560 



A. rubens, 548, 561 



A. vulgaris, 555 



Asterina, 562; 554 



Asteroidea, 557; 547 



.45fero/)e, 235; 231, 233 



Astomata, 100 



Astroides, 167 



Astropecten, 561 



Atractonema, 226 



Atrial opening, 592, 598, 600, 602 



Atrial siphon, 592 



Atrium, Genital, see Genital atrium; 

 of Cephalochorda, 598 ; of Tuni- 

 cata*, 594, 597, 599 



Atropus pulsatoria, 415 



Aulactinia, 165 



Aulactinium, 76 



A. actinastrum, 77 



Aiirelia, 151, 157 



A. aurita, 152; 153, 154; Strobiliza- 

 tion of, 155, 156 



Auricles, of Arenicola, 240 ; of Gas- 

 teropoda, 478; of Lamellibran- 

 chiata, 505 ; of Mollusca, 470, 471 ; 

 of Sepia, 518 



Auriculae, 567 



Auricularia, 556; 556, 590 



Autogamy, 28 ; 78 



Autolytus, 246 ; 245 



Autotomy, 303 



Autozooids, 162 



Avicularia, 533 



Axelsonia, 408 



Axial filament, 1 1 



Axial organ, of Crinoidea, 580; of 

 Echinodermata, 552; of Holothu- 

 roidea, 575 



Axial sinus, of Echinodermata, 551 ; 

 of Echinoidea, 570 



Axopodia, 11 



Axostyles, 14 



Babesia, see Piropiasma 

 Bacillus pestis, 442 

 Baculites, 529; 529 



B. capensis, 529 

 B. chicoenis, 529 

 Badhamia, 82; 81 

 Balanoglossida, 585 

 Balanoglossus, 585; 557, 583 

 Balantidiu7n, 102 



B. entozooti, 103 

 Balanus, 342 ; 342 

 Basal disc, 166 

 Basal granule, 1 1 

 Basal ossicles, 580 

 Basement hiembrane, 179 

 Basilar plate, 381 

 Basipodite, 298 

 Basommatophora, 495 

 Bathynella, 351 

 Bdellocephala, 187 

 Bdelloid rotifers, 213 

 Beaks of Cephalopoda, 519 

 Beds, Mussel, 508 

 Behaviour of Protozoa, 33 

 Belemnites, 524 

 Belemnitidae, 524 

 Belemnoidea, 513 

 Beroe, 173 

 Bibio, 439; 440 



Bilateral symmetry, 557; of Actino- 

 zoa, 159; of Ciliata, 4; of Echino- 



