390 



INDEX . 



Rostral septum, 183. 



Rostrum of Crab, 169 ; of Crab Mega- 

 lops, 217 ; of Crab Zoea, 207 ; of Cy- 

 clops, 225 ; of Lobster, 185. 



Salivary glands, 261, 347. 



Sarcode, 4, 9. 



Scaphognathite, 178, 180, 212. 



Scutellum, 247. 



Scutum, 247. 



Sea Urchin, xii, xiii, xiv.; ab-actinal 

 surfiice, 83; actinal surface, 83, 

 89; alveoli, 95; ambulacra, 84; 

 ambulacral area, 88; ambulacral 

 pore, 88; ambulacral suture, 88; 

 ambulacral vesicle, 91, 98; anal 

 plate, 85 ; auriculae, 90, 98 ; corona, 

 85; development of, 126; eggs, 99, 

 102 ; epiphysis, 96 ; gastrula stage, 

 107; hard parts, xii; heart, 94; inter- 

 ambulacral area, 88 ; inter-radial su- 

 ture, 87; internal structure, xiii ; in- 

 testine, 92, 94 ; madreporic body, 85 ; 

 mouth, 88, 129 ; muscles, 97, 98 ; 

 nei-vous system, 94, 98 ; occular plate, 

 85 ; oesophagus, 92, 94; ovarian plate, 

 85 ; pedicellariae, 84 ; peristome, 84 ; 

 periproct, 85 ; pluteus, 110 ; radii, 96 ; 

 radulae, 96 ; reproductive organs, 91 ; 

 segmentation, 102 ; spermatozoa, 100 ; 

 spines, 84; stone-canal, 93 ; teeth, 84, 

 90, 97 ; water tube, 91, 93, 98. 



Segmental organ, 162. 



Segmentation, 102, 319, 365; nuclei, 

 105; cavity, 107. 



Segmentation partial regular, 364 ; par- 

 tial irregular, 364 ; total, 364. 



Seminal fluid, 313; receptacle, 151, 

 204 ; vesicle, 149. 



Setae, 157, 226, 332. 



Setigerous glands, 152. 



Shell, 271, 335, 368; gland, 226, 368. 



Sinus, 195 ; venosus, 294. 



Siphon, 272, 336, 338, 339, 361, 368, 370, 

 377. 



Somite, 182. 



Spermatheca of Cyclops, 229 ; of Grass- 

 hopper, 263. 



Spermatic duct, 229. 



Spermatophore, 232, 352 ; sac, 232. 



Spermatozoa, 100, 233, 314, 332. 



Spicules, 25, 112. 



Spines, 84. 



Spiracle, 249. 251. 



Spleen of Squid, 345, 346. 



Sponge, v. ; budding in, 25 ; cloaca, 23, 

 24; endoderm, 29; osculum, 23,24 

 spicules, 25; syncitium, 29. 



Squid, xxix., xxx. : acetabula of, 327 

 anus of, 339; anal valve of, 378 

 aorta anterior of, 345, 347 ; aorta 

 posterior of, 345 ; arms of, 333, 336 

 337, 369 ; auditory nerve of, 363 

 auditory organ of, 363, 372 ; beak of, 

 333, 348, 355 ; blastoderm of, 365 

 branchial arterj' of, 340, 343; bran 

 chial heart of, 343, 343, 372 ; bran 

 chial vein of, 340, 345 ; buccal body of, 

 348, 354 ; chromatophore of, 334, 373 

 379; ciliary body of, 359; commis 

 sure, bracliial of, 354 ; cerebro 

 brachial of, 356, 357 ; circulatory 

 organs of, 341 ; cornea of, 358 ; cra- 

 nium of, 348; development of, 

 xxx. ; digestive organs of, 345 ; ear 

 of, 372 ; ear capsule of, 363 ; ear de- 

 velopment of, 368 ; egg of, 364 ; eye 

 of, 337 ; eye, anterior chamber of, 

 358 ; eye, development of, 368 ; e5'e, 

 invagination of, 367 ; eye, posterior 

 chamber of, 358 ; eye-stalk of, 367, 

 370 ; ganglion, brachial of, 354 ; 

 ganglion, cei-ebral of, 360 ; ganglion, 

 ciliary of, 359; ganglion, optic of, 

 360, 371; ganglion, pedal of, 357, 

 360 ; ganglion of retina of, 366 ; gan- 

 glion, stellatum of, 338 ; ganglion, 

 visceral of, 363 ; germinal area of, 

 365 ; gill of, 340, 343, 373 ; gill, de- 

 velopment of, 368; head of, 333; 

 head, cartilage of, 361, 363 ; hecto- 

 cotylus of, 349 ; hepatic duct of, 348 ; 

 ink bag of, 339, 378 ; intestine of, 339, 

 346 ; iris of, 358 ; jaws of, 348 ; lens 

 of, 358, 359 ; lingual ribbon of, 348, 



