INDEX. 



509 



Renal organs (see Excretory organ 

 and Kidney) 



Renal vessels, Snail, 295 



Reno-pericardial aperture ; Mus- 

 sel, 3 2 4> 335; duct, Snail, 275, 

 284 



Reproduction, Amoeba, 373 ; Cray- 

 fish, 187; Earthworm, 247 ; Frog, 

 5; Hydra, 343; Mucor, 423; 

 Mussel, 312 ; Snail, 277 ; Spiro- 

 gyra, 400, 406; Vorticella, 362 



Reproductive organs, Bean, 465 ; 

 Chara, 433 ; Crayfish, 186, 217 ; 

 Earthworm, 246, 268; Eurotium, 

 419 ; Fern, 449, 456, 458; Frog, 

 23,51; Hydra, 349, 357; Mu- 

 cor, 421, 423 ; Mussel, 312, 320 ; 



' Penicillium, 419 ; Snail, 276, 289 



Respiration, Bean, 469 ; Crayfish, 

 183 ; Earthworm; 245 ; Frog, 3, 

 22 ; Mussel, 308 ; Snail, 275 ; 

 Yeast, 383 



Respiratory organs, Crayfish, 182, 

 207, 221 ; Frog, 21, 48 ; Mussel, 

 307, 322 ; Snail, 275, 282 



Restiform body, 25 



Retina, 33, 118; development of, 

 172 ; histology of, 141 



Retinula, 234 



Rhabdome, 185, 234 



Rhinal process, 13, 64 



Rhinencephalon, 97 



Rhizoid, 431 



Rhizome, 443 



Root, Bean, 460, 465, 470 ; Fern, 

 448, 452, 456 



Root-cap, 448, 462, 471 



Root-filaments, Chara, 430 



Root-hairs, 448, 449, 458, 465 



Root-pressure, 469 



Rostrum, 190, 238 



S. 



SAC (see Cell-wall) 

 Saccharomyces, 377 388 

 Sacculus, 33, 1 20 

 Sacrum, 57 



Salivary duct, Snail, 285, 288 ; 

 gland, Earthworm, 242 ; Snail, 

 285 



Scalariform vessels, 446, 455 



Scaphognathite, 174, 182 



Scapula, 69 



Schizomycetes, 408 414 



Sclerenchyma, 446, 453, 454, 472 



Sclerotic, 33, 117 



Secondary thickening, 464 



Secundine, 478 



Seed, 479 



Segmental duct, 169; organ, 244, 



251, 252, 256 

 Segmentation, cavity, 166 ; of 



ovum, Crayfish, 187, 235 ; 



Earthworm, 247; Frog, 5, 158, 



165; Mussel, 312; Snail, 278, 



302 



Selaginella, 466 

 Seminal receptacle (see Sperma- 



theca) ; vesicle, 246, 268 

 Sense-organs, Earthworm, 246 ; 



Hydra (see Cnidocil) 

 Sepal, 476 



Septum narium, 13, 66, in 

 Seta, Crayfish, 203 ; Earthworm, 



241, 249, 251, 266; sac of, 251, 



266 

 Sex-organs (see Reproductive 



organs) 



Sexual generation, Fern, 457 

 Sexual reproduction, 400, 402, 



4i9 423 



Shell (see Exoskeleton) 

 Shell-teeth, 340 

 Shoulder-girdle, 68 

 Sieve-tubes, Bean, 464, 469, 473 ; 



Fern, 447, 454, 455 

 Sinus venosus, 17, 81, 90 

 Siphonal tentacles, 3 1 7 

 Siphons, 307, 317 

 Skeleton, Crayfish, 173, 189; Frog, 



ii, 55 



Skin, Frog, histology of, 145 

 Skull, 12 



Small intestine, 10, 15, 39, 45 

 SNAIL, 272 304 

 Somite, 174, 177, 240, 248 

 Sooty corpuscles, 356 

 Sorus, 444 

 Spermatheca, 250, 268, 293 



