616 



COMPARATIVE ANATOMY 



Rostellaria, 102 



rectirostris, 6 



Rostrifera, 6 



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

 Rotula, 293 



Rotulse (Echinoid.), 400 

 Rudistes (Hippu rites), 62 

 Ruff (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 



ScapJwpoda, 13 



Sckizaster, 293 



fa iialiferus, pedicellarise, 397 

 lacunosus, 294 



Schizoblastus, 315 



Schizocardium, 562 



,, brasiliense, gills, section, 



569 



Schizogoriy, 505 



Schwammerdam's vesicle, 233 



Scissurella, 5 



Scotoplanes, 418 



Scrobicularin jiipi'rafa, 52 



Scrobiculariidce, 51 



Scurria, 5 



Scuta buccalia, 360 



Scutella adoratia, 360 



Scutella, 293 



sexforis, 292 



Scutellidve, 291 



Scutum (Parmorphus), 4 



Scyllceidce, 13 



Scytaster, 326 



Sea urchins (= Echinoid.), 316 



Semiproboscidifera, 6 



Semites ( = fascicles), 349 



Seniper'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 

 (irulentu, shell, 70 

 officincdis, circulatory system, 209 ; 

 eye, 172 ; genital organs, female, 

 240 ; genital organs, male, 239 ; 

 renal sacs, 224 

 ,, Savigniana, 83 



Sepiadarium, 24 



H:-/iiii/it, 24 ; nervous system, 148 



Sepioloidea, 54 



Sepioteuthis, 24 



Septibranchia, 21 ; gills, 92 



Sickles = radii (Echinoid.), 400 



Siteiiiri. Xarxii, 21 



Si liquid, 115 



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



SimipaHiata, shell, 63 



Siphon (Ceph.), 37 ; = accessory intestine 

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

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



Si pin i H in ta, 44 



Siph o it ode n taliu m , 13 



Siphonoplax, 64 



Siphonostomata, 44 



Siplnmcle (Ceph.), 37 



Solaridie, 6 



Solasteridce, 298 



Solen, 19 



Solenidce, 19 



Solenocurtus, 19 



Solenogastres, 3 



Solenogastridce, section, 212 



Solenomya, 91 



Solenomyidce, 14 



Solenojwda, 228 



Spadix, 116 



Spatagocystis, 295 



Spatangidce, 293 



Spatangoida, 293 ; ambulacral brush, 



section, 433 



Spatangoidea, larva, 509 

 Spatangomorpha, 293 

 Spatangus, 293 



jmrpureus, apical system, 324 ; 



oral region, section, 441 

 Speugel's organ, 84 

 Spermatophore, 241, 242 

 Sjilin ri'i-liiitiia. .".in 



gramdaris, pedicellaria?, 397, 



398 



Sphseridia (Echiiioid.) 392 ; section, 392 

 fyi/iti /-in in, 17 

 Sphcrmnis, 336 

 Spiculum amor is, 237 

 Spiracles (Blast.), 382 

 Xpiriila, 24 ', shell, section, 69 



prototypes, 23 

 Spirulidce, 24 



Spirulirostra, 24 ', shell, section, 69 

 SpondylidcB, 53 

 ^/iiuii/i/fiift, 62 

 HI HI i tr/ iobran chcca, 11 

 Spongylocentrotiis, 290 

 Star-fish ( = Axtrriiiilini'). 316 

 Steganobranchia, 12 

 Hti'/iiiiiiii-riii us. ,;n~ 

 Stdidiocrimis, 307 

 HI <!! aster, 296 



Stelleridea ( = Asteroidea), 295 

 Stenoglossa, 6 



Sternum, 348 



Stewart's organs (Echinoid.), 442 



Hticliaster, 298 



,, nlbi'lus, 506 



