INDEX. 



SO/ 



Notochord, 12, 168, 170 



Nucellus, 460, 478 



Nucleolus, 123, 389, 393, 399 



Nucleus, 122 ; Amoeba, 370; Bean, 

 461; Chara, 433, 434; Fern, 

 444; Mucor, 421 ; Penicillium, 

 417; Protococcus, 389, 391, 

 393 ; Spirogyra, 398, 404 ; Vor- 

 ticella, 362, 365 ; Yeast, 379 



Nyctotherus, 368 



O. 



OCCIPITAL condyle, 59 



Odontoid process, 56 



Odontophore, 274, 287, 288 



QZnothera, 480 



OZsophageal glands (see Calcifer- 

 ous glands) 



CEsophagus, Earthworm, 254, 255; 

 Frog, 43 ; Snail, 274, 285 (see 

 also Gullet) 



Oil, 407 



Olfactory capsule, 64 ; epithelium, 

 144; lobe, 97; organ, Crayfish, 

 184, 232, Frog, 32, in ; ven- 

 tricle, IOO 



Omosternum, 69 



Oogonium, Chara, 431, 434, 439 



Oosperm, 4, 158, 235, 302, 358 



Oosphere,45o,46i (see also Ovum) 



Oospore, 434 



Opercular membrane, 6, 162 ; de- 

 velopment of, 163, 171 



Ophthalmite, 176, 201 



Optic bulb, 233, 234 ; chiasma, 

 99; cup, 172; lobes, 25, 98; 

 pit, 237; stalk, 172; thalami, 

 26, 98 ; tract, 99; ventricle, 100 



Organ of Bojanus, 311, 322, 335, 



337 



Os cruris, 72 



Ossicles, Crayfish stomach, 178, 

 208, 210 



Otocyst, 300, 331 



Otolith, Crayfish, 231; Cyclas, 

 331 ; Frog, 120; Snail, 300 



Ovary, Crayfish, 186, 218; Earth- 

 worm, 269 ; Flowering plant, 



478; Frog, 23, 40, 52, 154; 

 Hydra, 344, 357; Lobster, 219 



Oviduct, Crayfish, 218; Earth- 

 worm, 269; Frog, 23, 40, 53, 

 54; Snail, 290, 292 



Ovisac, 219 



Ovotestis, 276, 285, 289 



Ovule, 460, 478 



Ovum, Bean, 461, 466, 479; 

 Chara,434; Crayfish,2i9; Earth- 

 worm, 246, 270; Fern, 450, 

 459; Frog, 5, 24, 154; Hydra, 

 344. 357; Mussel, 312, 339; 

 Snail, 277, 302 



Oxygen, 379, 390, 403 



P. 



PALATINE, 61 



Palato-quadrate cartilage, 63 



Palisade parenchyma, 465, 475 



Pallium (see Mantle) 



Pancreas, 45 ; ducts of, 47 ; his- 

 tology of, 149 



Papillae, of tongue, 34, m 



Paragnatha, 202 



Parasphenoid, 61 



Parenchyma, 453, 454 



Paranucleus (Amoeba), 370, 374 



Pasteur's solution, 380, 384 



Pectoral arch (see Shoulder girdle) 



Pedal gland, 273, 281, 288; sinus, 

 289, 294 



Peduncle, 476 



Pelvic arch (see Hip girdle) 



Penicillium, 416 



Pericardium, Crayfish, 182, 222 ; 

 Frog, 8, 40, 43; Mussel, 310, 

 3 J 9 335, 3375 Snail, 275, 284 



I'eriganglionic glands, 32, 103 



Perilymph, 34, 119 



Periotic capsule (see Auditory 

 capsule) 



Peristome, 274, -282, 360, 364 



Peristomium, 240, 249 



Peritoneal pores, 244, 250 



Peritoneum, Frog, 42 ; Earth- 

 worm, 243, 266 



Perivisceral fluid, 244, 253 



Pes, 3 



