450 



INDEX 



Ammonium bicarbonate, 



presence in halo zone, 349 



released by hydra, 349, 361 

 Ammonium ion, impermeability of cell 



membrane to, 349 

 Amoeboid motion, factors affecting, 357 

 Ampliirna, 



calcification by, 276 



carbon fixation by, 276 

 Anacrophore, 189 

 Anaplotelic, 189 

 Anatomical regions, of hydra, 1 

 Anions, on feeding reflex, 213, 215 

 Anisorhizic, 189 

 Anthopleiira elegant issima, 



algae, role of, 258 



algae, absence of, 255 



animal to algae ratio in, 266 



symbiosis in, 255 



tissue culture of cells, 245-254 



toxins of, 177 



weight changes on star\ation, 258 



zooanthellae of, 255-257 

 Arthropods, in reef building, 270 

 Asexual reproduction, 



in Craspedacusta, 318 



in hydra, 441-448 

 Asparthione, on feeding reflex, 211 

 Astomocnidae, defined, 188 

 Athecate hydroids, 



growth zones of, 298 



hydranth development, 298 



reconstitution of, 305 

 Atoll, 269 

 Attachments, hydra, 51-66 



between epithelial cells, 62 



between epithelial cells and mesoglea, 

 62 

 Atrich, 189 



discharge of, 194 



role of, 194 

 Aurelia, strobilization of, 336 



Bicarbonate, 



on pH of culture solution, 350 

 pH, relation to, 361 

 source of, for calcification, 274, 275 

 Bioassay, for hydra growth factor, 235 

 Biological variability, 399 

 BouganvilUa, longevity of, 311 

 Branch tube, 292 

 Brom cresol purple, visualization of mi- 



croenvironment with, 338 

 Bud, hydra, 



chemical changes during growth of, 



446 

 developmental stages of, 441, 443 

 DNA/protein ratio of, 445, 446 

 growth of, 354 

 histology of, general, 8 

 initiation of, 441, 442 

 initiation of, in synchrony, 441 

 jimction with parent column, 8, 42 

 origin of, 426 

 Budding, 



Cia.s))ed(iciista, 3 17-336 

 factors influencing, 318 

 feeding rates on, 329 

 interactions in, 323, 331 

 pattern of, basic, 320 

 patterns of, 317, 320-323, 327 

 physiological interactions of, 320 

 sequence of, 320, 321 



nutridon on, 320, 325-328, 330, 



331, 335 

 temperature on, 318, 32-325, 330- 



334 

 temperature optima, 320 

 hydra, 441, 446 



effect of sexual difterentiation on, 



366 

 inhibition of, 448 

 chemical changes during, 441-446 

 Buds, Craspedacusta, types of, 319 

 Bufotenin, 167, 186 

 Butyrobetaine, 180 



Banthine, 181 



Basal disk, general histology, 7 



Basal granule, 85, 86 



Basal processes, of epithefia, 51 



Basitrich, 189 



Battery, of Physalia nematocysts, 169 



Bicarbonate, 353 



deposition, assay of, 275 



equilibrium with pH and pCO^, 361 



pCOj, relation to, 361 



Calcification, 269-285 



in Acropora cervicornis, 272 



by ahermatypic corals, 275-277 



assay of, 271 



carbon dioxide, role of, 282-284 



carbonic anhydrase on, 272 



by corals, 269 



Diamox on, 272 



diurnal rates of, 277 



factors affecting, 271 



by hermatypic algae, 275-277 



