462 



INDEX 



Non-living diet, for hydra, 234, 

 Nuclear membrane, 



of interstitial cell, 78 



pores of, 78, 88, 90 

 Nuclear pores, 78 



of interstitial cells, 78, 88, 90 

 Nucleic acid, changes in budding hydra, 



441, 448 

 Nutrient cell, 52, 54 

 Nutrition, 



on budding sequence, Craspedacusta, 

 320-335 passim 



on differentiation, 234 



growth, on heat treated food, 235 



on growth pattern, Campanidoria, 301 



of hydra, 233-243 



on regeneration, 405, 406, 420 



on upright growth, Campanularia, 302 



Ohelia, 331 



aging of, 375 

 Operculum, 81, 84-87, 112 



function of, 195 



laminated stnicture of, 84, 127 



of stenotele, 132, 134 



types of, 127 

 Osmolarity, regeneration on, 405 

 Oxaloacetate, 361, 412 



on calcification, 283 



on regeneration, 410 



reversed effect of lipoic acid, 410 

 Oxygen, on calcification, 273 

 Oxygen production, by hermatypic cor- 

 als, 273 



Parasite, of hydra, 400 

 Parasitism, on regeneration, 404 

 Parthenogenesis, Daphnia, feedback fac- 

 tors affecting, 356 

 Particles, engulfed by gastrodemiis, 241 

 Patterns of colonial growth, 



Campanularia, 298-300 



Cordi/lopliora, 311 

 pCO., 344 



on amoeboid motion, 357 



barriers to, 341 



bicarbonate, relation to, 361 



blood, mammalian of, 340 



calibration of, 354 



control, 



by internal gradient, 341 

 by macroenvironment, 341 

 method of, 351, 353 



pCO., 



control, 



by microenvironment, 341 



of sexual differentiation, 342, 343 



on Cordylophora, 295, 356 



of crowded hydra cultures, 348 

 equilibrium with pH and bicarbonate, 

 361 



of a fresh water pond, 348 



gradient of, 341, 358 



microenvironment, changes in, 338 



of microenvironment, increased acid- 

 ity, 338 



micromethod for, 344, 345 



nutritional level, relation to, 341 



pH, relation to, 354, 361 



respiration, relation to, 341 



on sexual differentiation, 348, 349 



on slime mold aggregation, 357 



on systems other than hydra, 354 



of water, aerated, 340, 348 

 Pedal disk, 314 



acid phosphatase of, 385 



gland cell of, 40 

 Pedicel, 



of Campanularia, 299 



of thecate hvdroids, 299 

 Peduncle, 



of bud, 8 



histology of, general, 7 



properties of, 433 

 Pelmatolit/dra oligactis, 52, 57, 63, 82, 



432, 437 



epidermis of, 53 



gastrodemiis of, 53 



grafted to H. pirardi, 433 



septate desmosome of, 56 



see also Hydra 

 Penetrants, 188 



see also Nematocyst 

 Pennaria, development of, 299, 300 

 Peptide, of Plujsalia toxin, 173 

 Periodicity, 



of capsular wall, 134, 142 



in nematocysts, 148 



of nematocyst tubule, 134 



of striations in nematocyst tubule, 86 

 Perisarc, 289, 292, 309, 341, 354, 357, 



358 

 Peristalsis, 293 



of Campanularia, 379 



of Cordylophora, 288, 379 



rate of, in Cordylophora, 289 



synchrony of, 289 

 Permeability, of inhibitors, 408 



