604 



COMPARATIVE ANATOMY 



Amphiuridce, 300 

 Amphoracrinus, 307 

 Ampullae, madreporic, 420 



,, tentacle, 430 

 Ampullaria, 100 



,, (Lanistes), Boltemana, shell, 



161 



(Geratodes), chiquitensis, 161 



crocistoma, 161 



Geveana, 161 



purpurea, 161 



(Ceratodes), rotula, 161 



Swainsoni, 161 

 Ampullaridce, 6 

 Ananchytidce, 293 

 Anapta, 466 

 Anaspidce, 10 

 Anatina, 21 

 Anatinidce, 21 

 Anchylosis (Crin.), 378 

 Ancula, 13 

 Ancyloceras stage, 68 

 Ancylus, 8 

 Ankyroderma, 287 

 Annulus, 126 

 Anodianus, 503 



Anodonta, 17 ; circulation, 207 ; gills, 

 95 ; larva, 264 ; section, 221 

 ,, cygncea, 34 



Anomia, 15 ; shell, 63 

 Anomiidce, 14 

 Antedon, 313 ; embryo and larva, 510, 



534-543 

 Antedon indsa,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 

 Apiocrinidoe, 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 - 

 Archaster, 296 

 Archasteridce, 296 



Archiacia, 295 



Archidoris, 13 



Architcenioylossa, 5 



Arcidce, 15 



Arcus (Echinoid. ), 400 



Argentea (Ceph.), 197 



Argonanta, 2J^ 24 ; gonads, female, 230 ; 



nervous system, 148 

 '"7/", maU-, 243 



Arion, 8 



ater, 9 

 A ri<>phanta, 8 

 A r risiocystis, 31-'> 

 Aristotle, lantern of, 400-403 

 Articulamentum, 39 

 ArticnJi'f<i, .11 Hi 

 Ascocystis, 313 

 Ascoglossa, 11 

 Asiphonidta, 44 



(Brechites), 21, 20 

 ilich"t"iiinii<, 66 

 m, 4 



, 285 ; organisation, 477 

 Aspidodiadema, 290 

 Aspidodiadematidce, 290 

 Aspidosmna, 295 

 Astartidce, 50 



. 1 \/. riiriiiithion glacifdis, pedicellariae, 395 

 ., rubens, madreporic plate, 



421 



pedicellariae, 395 



Asterias, 299 



aci'f<xjiii/, 506 

 atlanticci, 506 

 calamaria, 506 

 ,, capensis, 421 



microdisci's, 506 

 pulyplc.v, 421 

 rubens, 507 



spirabilis, 503 

 ,, sticantha, arm, 396 



(Siollasterias), rolsellata, arm, 



396 



tenuispina, 421 

 vulgaris, 507 

 Asteriidce, 299 

 Asterina, 297 



gibbosa, circular canal, etc., 425 ; 



ontogeny, 525-531 

 ,, Weya, 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 -apsis, 297 

 Asthenosoma, 290 



urens, spine, 390 ; test, 472 ; 



viscera, 443 

 AstrocMe, 301 

 Astroclon, 301 



