616 



COMPARATIVE ANATOMY 



Rostellaria, 102 



,, rectirostris, 6 



Rostrifera, 6 



Rostrum (Ceph.), 68 ; (Gastr.), 102 

 Rotula, 293 



Botulas (Eohinoid.), 400 

 Rudistes {Jffippurites), 62 

 Ruff (Gastr.), 107 



Sacculi (Crin.), diagram, 490 



Scdeiiia, 290 ; apical system, 319 



Saleniidcc. 290 



Saxicara, 19 



Scceurgus, 243 



Si'idai'tidw, 6 



ScajjJiander, 46 



Scaphctiidridce, 10 



Scaphites stage, 68 



Scaphnpoda, 13 



Schizaster, 293 



„ canaliferus, pedicellarias, 397 



laci/nnsi's, 294 



SrMzohlastus, SIS 



Schizijcordiu/n, 562 



,, brasiliense, gills, section, 



569 



Schizogony, 505 



Schwammerdam's vesicle, 233 



Scissurella, 5 



Scfffnplancs, 418 



Srrohiindaria pipei'ata, 52 



>Srrobii:td(irihhf^^ 51 



Sctirria, 5 



Scuta buccalia, 360 



Scutella adoratia, 360 



Sciitdla, 293 



sexfo-ris, 292 



Scutellidw, '291 



Scutum {Po nTWrphus)^ 4 



Scyllcekhc, 13 



Sri/tasfn; 326 



Sea urcliins ( = Echinoid.), 316 



Seiniproboscidifera, 6 



Semites ( = fascicles), 349 



Semper 's organ, 166 



Sepia, 224. ; alimentary canal, 189 ; body 

 cavity, 213 ; cephalic cartilage, 

 126 ; ctenidium, 85 ; diagram, 36 ; 

 gill, 96 ; gonad, male, 231 ; onto- 

 geny, 266, 267 ; nervous system, 

 148 ; renal sacs, 213 ; shell, sec- 

 tion, 69 ; spermatophore, 242 

 acuhata, shell, 70 

 officinalis, circulatory system, 209 ; 

 eye, 172 ; genital organs, female, 

 240 ; genital organs, male, 239 ; 

 renal sacs, 224 

 „ ScLvignictTia, 83 



Sepiiadarium, 24 



Sepiohi, 24 ; nervous system, 148 



Scpvihiidea, 54 



Sepiotei/thi.^, 24 



SiptibrancJiia, 21 ; gills, 92 



Sickles = radii (Echinoid.), 400 

 Sileaia Sarsii, 21 

 SiliqvAa, 115 



Sinistral twist (Gastr.), 66, 60, 160 

 Sinu^xdliata, shell, 63 

 Siphon (Ceph.), 37 ; =accessory intestine 

 (Echinoid.), 481 ; (Gastr.), 43; (Lam.), 

 exhalent, 49 ; (Lam.), inhalent, 49 

 Siphoniata, 44 

 iSiphonodeiitalium, 13 

 Siphouoplax, 64 

 Siphonostmnata, 44 

 Siphuncle (Ceph.), 37 

 Solaridw, 6 

 Solasteridce, 29S 

 Solen, 19 

 Solenidir, 19 

 Solenocurtus, 19 

 Siihniii'jasti'cs, 3 

 Solenogastrida:, section, 212 

 Solenomya, 91 

 Solenomyidce, I4 

 Solenopoda, 228 

 Spadix, 116 

 Spatagocystis, 295 

 Sputa.ngidcr, 293 

 Spataugiiida, 293 ; ambulacral brush, 



section, 433 

 Spatangoidea, larva, 509 

 t^pataiiginii(y)pha, 293 

 Spatangits, 293 



,, purpureiis, apical system, 324 ; 



oral region, section, 441 

 Spengel's organ, 84 

 Spermatophore, 241, 242 

 Spliairechinus, 290 



„ graniiktris, pedicellarise, 397, 



398 

 Sphseridia (Echinoid.) 392 ; section, 392 

 Sphceriu^i, 17 

 Sphceronis, 336 

 Spiculum amoris, 237 

 Spiracles (Blast.), 382 

 Spirula, 24 \ shell, section, 69 



,, prototypos, 23 

 S^'ifidida; 24 



Spi ralirostra, 24 ; shell, section, 69 

 Sp'tudyiidce, 53 

 Sju^ndy/us, 62 

 Spongii^brancfuea, 11 

 Spongylocentrotus, 290 

 Star-fish { = Asteroidea), 316 

 Steganobranch ia, 12 

 Steganocrinu^, 307 

 SMidincrinv.s, 307 

 Stdlaster, 296 



Stelleridea { = Asferoidea), 295 

 Stenoglossa, 6 

 S/ereiK,i)iiata, 290 

 Sternum, 348 



Stewart's organs (Echinoid.), 442 

 Stichaster, 298 



„ albidus, 506 



