454 



INDEX 



Development, 



of CampunuJarki, 291-316, 875, 376 



of Conlyloplwra, 287-295 



of thecate liydroids, 297 

 Diamox, 



on calcification, 272 



inhibits carbonic anhydrase, 272 

 Differential growth, of corals, 284 

 Digestion, intracellular, 241 

 Digestive cell, 1 



columnar appearance of, 4 



cyclical changes in, 4 



flagella of, 4 



functions of, 4 



histology of, general, 4 



of hypostome, 34,36 



lipid inclusion bodies of, 20 



mesoglea, in contact with, 4 



muscle filaments in, 4, 5 



inclusions in, 4 



of peduncle, 7 



of tentacle, 7 



vacuoles in, 4 



villi of, 4 

 Diplosome, 80, 81 



of interstitial cell, 94 

 Discharge, of nematocyst, 133, 149-151 

 DNA, distribution of, in budding hydra, 



441 

 DNA/protein ratio, 441-447 



of hydra buds, 444, 446 



of hydra parents, 443, 444 

 Double membranes, 



cnidoblast, 10, 14 

 elaborate in, 3 

 regression in, 3, 16 



cnidocyte, absence of, 16 



in ectodermal gland cell, of basal disk, 

 7 



in gland cells, 4, 18 



in interstitial cells, 2 



regression of, cnidoblast, 3, 16 



see also Endoplasmic reticulum 

 Doubling time, of Cordylophora, 288 



Echinoderms, in reef building, 270 

 Ectoderm, 1, 8, 24 



acid phosphatase of, 385 



attachments of, 51 



of bud, 8 



endoderm, relation to, 6, 22, 28 



histology of, general, 2 



hypostomal, 7, 34 



mesoglea, relation to, 3, 22 



muscle filaments of, 24 



Ectoderm, 



muscle of, longitudinal, 5 



of peduncle, 7 



snap-fastener relationship of, 8 



surface of, 10 



of tentacle, 7 

 Electrical stimulation of nematocyst dis- 

 charge, 156, 163, 182 

 Enchijtracus fragmentosiis, endoplasmic 



reticulum of, 88, 124 

 Endodenn, 1, 32, 38 



of basal disk, 7 



ectoderm, relation to, 6, 22, 28 



histology of, general, 4 



hypostomal, 7, 34 



mesoglea, relation to, 3, 22, 24 



muscle filaments of, 5 



of peduncle, 7 



of tentacle, 7 



vacuolated, 30 

 Endoplasmic reticulum, 80-82, 131 



appearance of, 80 



of cnidoblast, 3, 83-85, 96 



developed, highly, 83, 84 



of Enchiitracus frogmentosus, 88, 124 



regression of, 84, 85, 114 



see also Double membranes 

 Environment, 



on developmental phenomena, 204 



on feeding reflex, 213 



on regeneration, 399, 405 

 Epidermis, 1 



of Chlorohijdra, 53 



of Pelmotoliydra, 53 



see also Ectoderm 

 Epithelial layers, of hydra, 51 

 Epithelial muscle fiber, 51 

 Epithelio-muscular cell, hydra, 1, 8, 10 



of bud, 42 



embeds cnidocyte, 30, 32 



histology of, general, 2 



of hypostome, 34 



muscle filaments, relation of, 5 



of peduncle, 7 



receptor cell, acts like a, 6 



surface of, 2 



of tentacle, 7 

 Epithelium, basal processes, of, 51 

 Eurytele, 189 

 Extracellular space, 



granules in, 22, 26, 30, 32 



glycogen of, 79 

 Extrinsic factors, on regeneration, 404 



