66o 



INDEX 



Rastrites, 2S2 



Ratarula larva, 302 



Rathkea, 265, 270 



Ratio (Spencer's) between bulk and sur- 

 face of organism, 14, 23 f., 31 f. 



Reactions, chemical, of protoplasm and of 

 vacuoles, 13 ; motile, of Protozoa, 19 f. 



Receptaculites, 207 



Receptaculitidae, 207 



Rectal caeca, of Aster ias ruhens, 439 ; of 

 Asteroidea, 459 ; of Astropecten, 459 ; 

 of Aster ias, 459 ; of Asterina, 459 ; of 

 Echinasteridae, 459 ; of Astropectinidae, 

 459 



Rectum, of Asterias rubens, 439 ; of IIolo- 

 thuria nigra, 563 



Red colour of sea, due to Dinoflagellata, 

 132 



Red Corals ( = Coralliidae, 352) 



Red marrow of bones, habitat of resting 

 states of malarial parasites, 106 n. 



Red snow, 125 



Redi, on reproduction of Blowflies, 42 



Reduction divisions, 75 n. ; of nucleus, 

 116 u. ; in Monocystis, 96 ; in Gucci- 

 dium, 100 ; in Acystosporidae, 104 f. 



Reef Corals, distribution of, 3S9 



Reefs, Coral-, 390 ; barrier-, 390 f. ; fring- 

 ing, 390 f. ; atolls, 390 f. 



Regeneration, 35 ; of Stentor, 35 ; of 

 Thalassicolla nucleata, 79 n. ; of In- 

 fusoria after division, 145 ; of oral 

 apparatus of Ciliata during conjugation, 

 151 



Regular Urchins, 529, 530 = Endocyclica, 

 q.v. 



Relapses of malarial fevers explained, 106 



Relapsing fever, inoculated by Zambezian 

 Tick, 121 u. 



Relationship, cellular, explained, 10 



Reniera, 217, 223 



Renilla, 340, 359, 360, 363; R. reni- 

 formis, 363 



Renilleae, 363 



Renillidae, 363 



Reiqihax, 59 



Repellent stimuli, response to, 20 f. 



Reproduction, 10, 23 f. ; of Actinophrys 

 sol, 72 ; of Radiolaria, 84 f. ; of 

 Flagellata, 107 ; of Choanotiagellates, 

 122 ; of Opalina, 123 f. ; of Volvocidae, 

 126, 127 f., 129 f.— see also Brood- 

 division, Spore, Syngamy 



Reproductive cells, 31 — see also Gametes, 

 Brood-cell 



Reproductive organs — see Genital organs 



Reserve(s), 16, 37 ; accumulation of, 9, 13, 

 32 f. ; digestion of, 16 ; consumption of, 

 in brood-formation, 24, 32 f. ; of Flagel- 

 lates, 110, 115 ; -products, of brood- 

 mother-cell, 32 



Reservoir of contractile vacuole, of Flagel- 



lates, 110, 115 ; in Euglenaceae, 125 ; 

 of Vorticella, 157 



Respiration, 8, 14 ; intramolecular, 14 n. ; 

 in Asteroidea, 432 ; in Asterias rubens, 

 437 ; in AstrojJecten, 469 ; in Luidia, 

 469, 470 ; in Porcellanasteridae, 470 ; 

 in Ophiothrix fragiUs, 485 ; in Echinus 

 escule7itus, 517, 527 ; in Echinarachnius 

 jxirma, 544, 547 ; in Echinocardium 

 cordatum, 551 ; in Holothuria nigra, 

 563, 564, 566 ; in Molpadiida, 575 ; in 

 Synaptida, 576 ; in Antedon rosacea^ 

 582 ; in Cystoidea, 597 f. ; in Blas- 

 toidea, 600 



Reipiratory tree, of Holothuria nigra., 563 ; 

 of Holothuroidea, 569; of Aspidochirota, 

 569 ; of Dendrochirota, 569, 572 ; of 

 Molpadiida, 569 ; represented by 

 caecum of Elasipoda, 569 ; absent in 

 Synaptida, 576 ; in Pelagothuria, 572 



Response, 8 



Rest, of cell, 32 ; vegetative and absolute 

 contrasted, 37 — see also Cyst, Encyst- 

 ment, Hypnocyst 



Resting state of malarial parasites, 106 n. 



Reticulate, structure of protoplasm, 6 ; 

 endoplasm of Cystoflagellates, 110 ; of 

 Loxodes and Trachelitis, 144, 153 f. 



Retiograptus, 282 



Retiolites, 282 



Retiolitidae, 282 



Retractor muscles, of Aristotle's lantern, 

 526 ; of anterior part of body of Holo- 

 thuroidea, 568 ; of Dendrochirota, 568, 

 572 



Reusenapparat, 145 



Rhabdocrepid, 215, 224 (Crepis is the 

 term applied to the fundamental spicule 

 by deposition of silica upon which a 

 desma is formed. A desma of which 

 the crepis is uniaxial is called a rhabdo- 

 crepid desma) 



Rhabdoliths, 110, 114 



Rhabdoplev^ra, 617 



Rhabdosphaera, 110 



Rhabdospheres, 114 



Rhabdus, 183, 184 



Rhagon, 209, 213 



Rheotaxy, 20 f. ; its role in syngamy of 

 Mammals and Sauropsida, 34 



Rhipid aster, 453 463 



Rhipidodendron, 111, 112 f. 



Rhizocrinidae, 588, 589, 500 f. 



Rhizocrinus, 588, 501 



Rhizophysaliidae, 302, 308 



Rhizopoda, 50, 51 f. ; formation of 

 chromidia, 29 f. ; relations, 48 f. ; 

 shell, 49, 51 f. ; Filosa, 50, 52 f. ; 

 Lobosa, 50, 51 f. ; test-beariug, 53 f., 

 55 ; literature, 58 



Rhizostoma, 325 ; R. pulmo, 312, 325 



Rhizostomata, 310, 323, 324 



