604 



COMPA EA TIVE A NA TOMY 



Am2)hiuridce, 300 

 Aviphoracriiius, 307 

 Ampullae, madreporic, 420 



,, tentacle, 430 

 Ampullaria, 100 



,, {Lanistes), BoUemana, shell, 



161 



,, [Ceratodes), chiquitensis, 161 



,, crocistoma, 161 



,, Geveana, 161 



,, purpurea, 161 



,, (Ceratodes), rotula, 161 



,, Swainsoni, 161 



Ampullarida;, 6 

 Ananchytidce, 293 

 Anapta, 466 

 Anaspidcr, 10 

 Anatina, 21 

 AnatmidiK, 21 

 Anchylosis (Crin. ), 378 

 Ancula, 13 

 Ancyloceras stage, 68 

 Ancylus, S 

 Ankyroderma, 287 

 Annulus, 126 

 Anochanus, 503 



Anodonta, 17 ; circulation, 207 : gills, 

 95 ; larva, 264 ; section, 221 

 ,, cyijiHiii, 34 



Anomia, 15 ; shell, 63 

 Anomiidce, 14 

 Antedon, 313 ; embryo and larva, 510, 



534-543 

 Aiitcdon iiicisa, 312 ; larva, apical system, 

 318 

 ,, phalangium, young stage, 375 

 ,, rosaceus, 378 

 ,, tuberculosa, 297 

 Antedonidce, 373 

 Anthenea, 296 

 Autheneidcc, 296 

 Antispadix, 116 

 Aorta, 198, 202 

 Apetala, 293 

 Apiocrinidcc, 310 

 Apiocrimcs, 310 

 Aplacophm-a, 3 

 Aplustridce, 110 



A2)J>iKia, 10, 78 ; nervous system, 140 

 Aplysidhu 181 

 AplysiidK, 10 



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

 Aptychi (Ceph. ), 71 

 Arachnoides, 293 

 Arbacia, 290, 291 

 Arbaciidce, 290 

 Area, 15 

 ,, barbata, eye, 175 

 ,, N(m, 206 

 Archceocidaridce, 289 

 Archceocidaris { = Eehinocrinus), 289 

 Ar chaster, 296 

 A rchasteridcc, 290 



Archiacia, 295 

 Archidoris, 13 

 Architcenioglossa, 5 

 Arcidce, 15 



Arcus (Echinoid. ), 400 

 Argentea (Ceph.), 197 

 Argnnavta, 24, 24 ; gonads, female, 230 ; 

 nervous system, 148 

 „ argo, male, 243 



Ariuii, 8 



„ ater, 9 

 Ariojjhanta, 8 

 Aristocystis, 313 

 Aristotle, lantern of, 400-403 

 Articulamentuni, 39 

 Articulata, 309 

 Ascocystis, 313 

 Ascoglossa, 11 

 Asiphoniata, 44 

 Aspergillum [Brechites), 21, 20 



,, dichotomum, 66 



Aspidobranchia, 4 



As2nil(irhir(>tr>\ 285; organisation, 477 

 Asp!,ln,!i,nln„o, 290 

 Aspi,indhul,matida, 290 

 Aspidosoiiia, 295 

 Astartkke, 50 



Asteracanthion glacicdis, pedicellariee, 395 

 nibcns, -madreporic plate, 

 421 

 „ „ pedicellaria;, 395 



Asterias, 299 



,, acutisjnna, 506 

 atlantica, 506 

 calavmria, 506 

 capensis, 421 

 ,, microdiscus, 506 

 2)olypIax, 421 

 rubens, 507 

 spirabilis, 503 

 ,, sticantha, arm, 396 

 ,, (Stollasterias), rolsellata, arm, 



396 

 „ tenuispina, 421 

 „ vtdgaris, 507 

 Asteriidw, 299 

 Asterina, 297 



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



ontogeny, 525-531 

 ,, Wega, 506 



Astcrinidce, 297 

 A sferodiscus, 297 



Asteruidca, 295 - 299 ; alimentary canal, 

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

 section, 468 ; oral skeleton, 352 ; pedi- 

 cellarise, 395 ; stone canal, section, 421 ; 

 water vascular system. 463 

 Astero2^sis, 297 

 Asthenosoma, 290 



„ vrens, spine, 390 ; test, 472 ; 



viscera, 443 

 Astroehele, 301 

 Astroclon, 301 



