INDEX 



455 



Feedback variables (pH, pO^, pNHa, 

 pCO.) 



affects amoeboid motion, 357 

 on bud growth, 354 

 on Cordijlophora growth, 355, 356 

 Cijanca, stimulates strobilization in, 356 

 Daphnia, stimuhites partlienogenesis 



in, 356 

 general, 353-357 

 Hijdractinia, affects differentiation of, 



356 

 on isolated cells, 358 

 on multicellular masses, 358 

 Podocorijne, affects differentiation of, 



356 

 on slime mold aggregation, 357 

 on tentacle number, hydra, 354 

 Tiibularia, regeneration, inhibition of, 

 355 

 Feeding apparatus, for h\dra, 235 

 Feeding, of Craspedacusta, 320 

 Feeding movements, of hydra, 205 

 Feeding rate, on Craspedacusta budding, 

 329 



Feeding reflex, 203-231 

 acti\ation of, 203 



by reduced glutatliione, 204, 212 



by glutathione analogs, 209 



by proteases, 224, 225 

 activators of, 210 

 amino acids on, 211 

 anions on, 213, 215 

 asparthione on, 211 

 aspects of, general, 227 

 assay of, 206, 207 

 calcium required, 214, 225 

 cations on, 213 

 of corals, 230 

 of Cordijlophora, 226 

 duration of, method of expressing, 208 

 factors affecting, 204 

 glutamic acid on, 209, 211 

 glutamyl tripeptides on, 209-211 

 glutathione, as activator, 212 

 glutathione activation, 



discovery of, 204, 205 



specificity of, 209, 211 



concentration effects, 207, 219 

 glutathione analogs on, 209 

 in H. litt oralis, 203-230 

 initiation of, 207, 208 

 inhibited by, 



chelators, 214 



glutamic acid, 212 



cellular poisons, 209 



Feeding reflex, 



inhibitors of, 210 



ionic requirements for, 213 



limits to, 220, 221 



magnesium on, 215 



maximum response, 218 



of Physalia, 226 



quantitative expression of, 208 



reactivation of, 221 



repeatability of, 219 



sodium on, 215 



stages of, 206 



in starved hydra, 208 



temperature on, 222, 223, 229 



variation in 219. 220 

 Fibrils, ectodermal, 2 

 Filaments, of cnidocil, 135 

 Fishing tentacle, of PJiysalia, 169-171 

 Flagella, 24, 36, 49 



of digestive cell, 4 



endodermal, 49 



filaments of, 4, 5 



of gland cell, 4 



histology of, general, 4 



membrane around, 5 



number per cell, 49 

 Food uptake, by hydra, 241 

 Food reserves, 



of Craspedacusia frustules, 326 



disappearance of, Craspedacusta, 326 



and metabolic gradient, hydra, 426 



temperature on, Craspedacusta, 326 

 Foraminifcra, in reef building, 270 

 Frustule, Craspedacusta, 318-329 



budding of, 325 



differentiate into polyps, 321 



production, 



feeding on, 329 

 onset of, 321 

 Fulton effect, 295, 354, 355 

 Fumidil B, removes Microsporidia from 



hydra, 402 



Ganglion cell, 70, 72 

 Gastroderm, 1, 52, 253, 419 



acid phosphatase of, 385 



of Chlorohijdra, 53 



digests nematocyst, 438 



food reserx'es of, Craspedacusta, 326 



inclusions of, 54 



lipoic acid on, 416 



microvilli of, 54 



migration of, 416 



