616 



COMPARATIVE ANATOMY 



Rostellaria, 102 



rectirostris, 6 



Rostrifera, 6 



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

 Rotula, 293 



Rotulae (Echinoid.), 400 

 Rudistes (ffippurites), 62 

 Huff (Gastr.), 107 



SACCULI (Grin.), diagram, 490 



Salenia, 290 ; apical system, 319 



Saleniidce, 290 



Saxicava, 19 



Scceurgus, 243 



Scalariidce, 6 



Scaphander, 46 



Scaphandridce, 10 



Scaphites stage, 68 



Scaphopoda, 13 



Schizaster, 293 



canaliferus, pedicellariae, 397 

 lacunosus, 294 



SchizoUastus, 315 



Schizocardium, 562 



brasiliense, gills, section, 



569 



Schizogony, 505 



Schwammerdam's vesicle, 233 



Scissurella, 5 



Scotoplanes, 418 



Scrobicularia piperata, 52 



Scrobiculariidce, 51 



Scurria, 5 



Scuta buccalia, 360 



Scutella adoratia, 360 



Scutella, 293 



,, sexforis, 292 



Scutellidce, 291 



Scutum (Parmorphus), 4 



Scyllceidce, 13 



Scytaster, 326 



Sea urchins ( = Echinoid. ), 316 



Semiproboscidifera, 6 



Semites ( = fascicles), 349 



Semper's organ, 166 



Sepia, 224 ; alimentary canal, 189 ; body 

 cavity, 213 ; cephalic cartilage, 

 126 ; ctenidiura, 85 ; diagram, 36 ; 

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

 geny, 266, 267 ; nervous system, 

 148 ; renal sacs, 213 ; shell, sec- 

 tion, 69 ; spermatophore, 242 

 aculeata, shell, 70 

 officinalis, circulatory system, 209 ; 

 eye, 172 ; genital organs, female, 

 240 ; genital organs, male, 239 ; 

 renal sacs, 224 

 Savigniana, 83 



Sepiadarium, 24 



Sepiola, 24 ', nervous system, 148 



Sepioloidea, 54 



Sepiotei'this, 24 



Septibr* nchia, 21 ; gills, 92 



Sickles = radii (Echinoid.), 400 



Silenia Sarsii, 21 



Siliquia, 115 



Sinistral twist (Gastr.), 56, 60, 160 



Sinupalliata, shell, 63 



Siphon (Ceph.), 37 ; = accessory intestine 

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

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



SipJwnodentalium, 13 



Siphonoplax, 64 



Sipfwnostomata, 44 



Siphuncle (Ceph.), 37 



Solaridce, 6 



Solasteridce, 298 



Solen, 19 



Solenidce, 19 



Solenoc^lrtus, 19 



Solenogastres, 3 



Solenogastridce, section, 212 



Solenomya, 91 



Solenomyidce, 14 



Solenopoda, 228 



Spadix, 116 



Spatagocystis, 295 



Spatangidce, 293 



Spatangoida, 293 ; ambulacral brush, 



section, 433 



Spatangoidea, larva, 509 

 Spatangomorpha, 293 

 Spatangus, 293 



pvirpureus, apical system, 324 ; 



oral region, section, 441 

 Speugel's organ, 84 

 Spermatophore, 241, 242 

 Sphcerechinus, 290 



granularis, pedicellarue, 397, 



398 



Sphseridia (Echinoid.) 392 ; section, 392 

 Sphcerium, 17 

 Sphceronis, 336 

 Spiculum amoris, 237 

 Spiracles (Blast.), 382 

 Spirula, 24 ', shell, section, 69 

 prototypos, 23 



Spiwilirostra, 24 ; shell, section, ( 



Spondylidce, 53 



Spondylus, 62 



Spongiobranchcca, 11 



Spongylocentrotus, 290 



Star-fish ( = Asteroidea), 316 



Steganobranchia, 12 



Steganocrinus, 307 



Stelidiocrinus, 307 



Stellaster, 296 



Stelleridea (= Asteroidea), 295 



Stenoglossa, 6 



Stereosomata, 290 



Sternum, 348 



Stewart's organs (Echinoid.), 442 



Stichaster, 298 



albulus, 506 



