604 



COMPARATIVE ANATOMY 



Amphiuridce, 300 

 Amphoracrinus, 307 

 Ampullae, madreporic, 420 



,, tentacle, 430 

 Ampullaria, 100 



,, (Lanistes), Bolteinana, shell, 



161 



(Oeratodes), chiquitensis, 161 

 crocistoma, 161 

 Geveana, 161 

 purpurea, 161 

 (Geratodes), rotula, 161 

 Swainsoni, 161 

 Ampullaridce, 6 

 Ananchytidce, 293 

 Anapta, 466 

 Anaspidce, 10 

 Anatina, 21 

 Anatinidce, 21 

 Anchylosis (Grin. ), 378 

 Ancula, 13 

 Ancyloceras stage, 68 

 Ancylus, 8 

 Ankyroderma, 287 

 Annulus, 126 

 Anochanus, 503 



Anodonta, 17 ; circulation, 207 ; gills, 

 95 ; larva, 264 ; section, 221 

 ,, cygncea, 34 



Aiwmia, 15 ; shell, 63 

 Anomiidce, 14 

 Antedon, 313 ; embryo and larva, 510, 



534-543 

 Antedon incisa, 312 ; larva, apical system, 



318 



,, phalangium, young stage, 375 

 ,, rosaceus, 378 

 ,, tuberculosa, 297 

 Antedonidce, 373 

 Anthenea, 296 

 Antheneidce, 296 

 Antispadix, 116 

 Aorta, 198, 202 

 Apetala, 293 

 Apiocrinidce, 310 

 Apiocrinus, 310 

 Aplacophora, 3 

 Aplustridce, 110 



Aplysia, 10, 78 ; nervous system, 140 

 Aplysiella, 181 

 Aplysiidce, 10 



Apophyses (Chiton), 39 ; (Echin.), 350 

 Aptychi (Ceph. ), 71 

 Arachnoides, 293 

 Arbacia, 290, 291 

 Arbaciidce, 290 

 Area, 15 



,, barbata, eye, 175 

 Noce, 206 

 Archceocidaridce, 289 

 Archceocidaris ( = Echinocrinus), 289 

 Ar chaster, 296 



296 



Arcliiacia, 295 



Archidoris, 13 



Architcenioglossa, 5 



A rci dee, 15 



Arcus (Echinoid. ), 400 



Argentea (Ceph.), 197 



Argonauta, 24, 24 ; gonads, female, 230 ; 



nervous system, 148 

 argo, male, 243 



Anon, 8 



ater, 9 

 Ariophanta, 8 

 Aristocystis, 313 

 Aristotle, lantern of, 400-403 

 Articulamentum, 39 

 Articulata, 309 

 Ascocystis, 313 

 Ascoglossa, 11 

 Asiphoniata, 44 

 Aspergillum (Brechites), 21, 20 



dichotomum, 66 



Aspidobranchia, 4 



Aspidochirotce, 285 ; organisation, 477 

 Aspidodiadema, 290 

 Aspidodiadematidce, 290 

 Aspidosoma, 295 

 Astartidce, 50 



Asteracanthion glacicdis, pedicellariaa, 395 

 rubens, madreporic plate, 



421 



pedicellariae, 395 



Asterias, 299 



acutispina, 506 

 ,, atlantica, 506 

 calamaria, 506 

 capensis, 421 

 microdiscus, 506 

 polyplax, 421 

 rubens, 507 

 spirabilis, 503 

 ,, sticantha, arm, 396 

 ,, (Stollasterias), volsellata, arm, 



396 



tenuispina, 421 

 mdgaris, 507 

 Asteriidce, 299 

 Asterina, 297 



,, gibbosa, circular canal, etc., 425 ; 



ontogeny, 525-531 

 Wega, 506 

 Asterinidce, 297 

 Asterodiscus, 297 



Asteroidea, 295 - 299 ; alimentary canal, 

 etc., 484; arm, section, 411; optic cushion, 

 section, 468 ; oral skeleton, 352 ; pedi- 

 cellariae, 395 ; stone canal, section, 421 ; 

 water vascular system. 463 

 Aster opsis, 297 

 Asthenosoma, 290 



urens, spine, 390 ; test, 472 ; 



viscera, 443 

 Astrochele, 301 

 Astroclon, 301 



