616 



COMPARATIVE ANATOMY 



Rostellaria, 102 



rectirostris, 6 



Rostrifera, 6 



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

 Rotula, 293 



Rotulse (Echinoid.), 400 

 Rudistes (Hippurites), 62 

 Euff (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 



Schizoblastus, 315 



Schizocardiwn, 562 



,, brasiliense, gills, section, 



569 



Schizogony, 505 



Schwammerdam's vesicle, 233 



Scissnrella, 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 ; 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 

 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 



Sepioteuthis, 24 



Septibranchia, 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 

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

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

 Siphoniata, 44 

 Siphonodentalium, 13 

 Siphouoplax, 64 

 Siphonostomata, 44 

 Siphuncle (Ceph.), 37 

 Xtifon'dce, 6 

 Hn/tixteridce, 298 

 Solen, 19 

 Solenidce, 19 

 SuIi'Hiicurtus, 19 

 ti>/t'/iogastres, 3 

 Solenogastridce, section, 212 

 X,,/fin>mya, 91 

 Solenomyidce, 14 

 Solenopoda, 228 

 Spadix, 116 

 Spatagocystis, 295 

 Spatangidce, 293 

 SpatoH'i*,;,!,,, 293 ; ambulacral brush, 



section, 433 



Spatangoidea, larva, 509 

 Spatangornorpha, 293 

 Spatangus, 293 



purpureus, apical system, 324 ; 



oral region, section, 441 

 Speugel's organ, 84 

 Spermatophore, 241, 242 

 Splwerechinus, ,l',>n 



i/rtt.nularis, pedicellariae, 397, 



398 



Sphaeridia (Echiuoid.) 392 ; section, 392 

 Sphcerium, 17 

 Sphceronis, 336 

 Spiculum amoris, 237 

 Spiracles (Blast.), 382 

 ,S////-/'/, 24 ; shell, section, 69 



prototypes, 23 

 Spirulidce, 24 



X/iirttfirostra, 24 ; shell, section, 69 

 Spondylidcc, 53 

 Spondylus, 62 

 Spongiobranchcea, 11 

 Spongylocentrotus, 290 

 Star-fish ( = Asteroidea), 316 

 Steganobranchia, 12 

 Steganocrinus, 307 

 Stdidiocrinws, 307 

 Stellaster, 296 



Stelleridea ( = Asteroidea), 295 

 Stenoglossa, 6 

 Stereosomata, 290 

 Sternum, 348 



Stewart's organs (Echinoid.), 442 

 Stichaster, 298 



albulus, 506 



