INDEX 



461 



Mutualism, 



in A. elegantissima, 255-258 

 in C. viridissima, 259-267 

 on regeneration, 404 



Myocardium, 

 human, 378 

 lipofuscin of, 378 



Myofilament, see also Muscle (fiber, fila- 

 ment) 



Nematocyst, 10, 77-168, 187-202 

 of acontia, 190 

 appearance of, 80 

 capsule of, 81, 154, 155 

 chemical composition of, hydra, 134, 



148, 153-155 

 chemistry of, Metridium, 155 

 chemistry of toxin, 153 



see also Inhibitor, of succinoxidase 

 activity 

 classification of, 188 

 cnidoblast, 96 

 collagen of, 134, 154 

 contents, 



action of, 179 



isolation of, 179, 182 



see also Inhibitor, of succinoxidase 

 activity 

 development of, 3, 14, 16, 77-129 



role of Golgi, 82 



synchronous, 45, 81 

 of Diadumene franciscana, 191 

 digested by gastrodermis, 438 

 discharge of, 133, 149-151, 194-196, 



199, 200 



electrical, 156 



failure to, 201 



in Physalia, 169-171 



by satiated hydra, 202 

 extrusion of substances from, 197 

 function of, 179, 187, 194, 195 



in CaUiactis parasitica, 198-202 

 heat stability of, 155 

 isolation of, 



hydra, 154, 157 



Metridium, 157, 186 



Physalia, 157, 171, 172 



undischarged, 157 

 hydroxyproline content of, 155 

 5-hydroxytryptamine of, 186 

 loss of, on feeding, 153 

 of Metridium senile jimhriatum, 190 

 neck of, 83 



Nematocyst, 



nomenclature of, 188 



controversy over, 190-192 

 periodicities in, 86 

 Physalia, 



in gastrodermis, 177 



isolation of, 157, 171, 172 



origin of, 175 



size of, 169 

 replacement of, 153 

 as a secretory product, 77 

 staining properties of, 155 

 structure of, 131-151, 187, 190-193 

 as a systematic tool, 187 

 toxin of, 169, 173, 194 



see also Inhibitor, of succinoxidase 

 activity 

 transport, 



in Microsiomum, 437 



in Physalia, 176 



see also Cnidoblast, migration 

 tube of, 81-85 



formation, 84 



retraction of, 85 



spines and thorns of, 84 

 types of, 187, 190-193 

 Nematocytes, 52 

 Nerve cell, 

 absence of, 6 

 in bundles, 72 



confused with mitotic spindle, 72 

 contacts cnidoblast, 72 

 of Cordylophora, 69, 70, 72, 293 

 fiber of, 70 

 of hydra, 69, 72 

 interconnections of, 70 

 isolation of, 73 

 methylene blue stain of, 73 

 multipolar, 73 

 not needed, 6 



possible errors in identification, 74 

 sense hair of, 70 

 silver stains of, 69-72 

 types of, 69 

 Nerve drugs, on regeneration, 409 

 Nerve fiber tract, 70 

 Nerve net, 

 epidermal, 74 

 topography of, 69 

 Nervous system, 69-76 

 controversy over, 69-76 

 of hydra, 69, 72 

 methylene blue stain of, 73 

 of Velella, 70 

 Neuro-sensory cell, 70, 72 



