664 



INDEX 



Sphaeroidea, 77, 77 f. 



Sphaeronectes, 306 



Sphaeronectinae, 306 



Sphaerophracta, 78, 80 



Sphaerozoea, 77 n. 



Sphaerozoidae, 85 



Sphenopus, 404 



Spheraster (an aster in which the centrum 

 is large, with a diameter equal to or 

 greater than one- third the length of the 

 actines), 233 



Sphere, 184 



Spicatae, 362 



Spicules, calcareous, of Coccolithophoridae, 

 114 ; siliceous, of Heliozoa, 71, 74 ; of 

 Kadiolaria, 83 ; of Silicoflagellata, 110 ; 

 of Sponges, 170 f. ; composition, 170 ; 

 structure, 171, 172 ; classification, 183 ; 

 forms of, 184, 222, 224 ; development, 

 232 ; of Alcyonaria, 334 f., 336 



Spiudle, in cell-division by mitosis, 25 f. ; 

 intranuclear, of Euglypha, 29 



Spines, of pelagic Foraminiferal shell, 66, 

 69 ; of Globigerina bulloides, 69 ; of 

 Asteroidea, 454 ; of arms of Ophiothrix 

 fragilis, 479 ; of arms of Ophiuroidea, 

 491 ; of Echinus esculentus, 505 f. ; of 

 Endocyclica, 531 f. ; of Cidaridae, 532 ; 

 of Arbaciidae, 532 ; of Echinothuriidae, 

 532 ; of Colobocentrotus, 532 ; of Hetero- 

 centrotus,532 ; of Echinarachnius parma, 

 543 ; of Echinocardium cordatum, 550 



Spinipora, 284, 286 



Spintharophora, 216, 217 f. 



Spinulosa, 461, 462 f. 



Spiral, of stalk and stalk-muscle in Vorti- 

 cella, 156 f. ; ridge on tentacles of Suc- 

 toria, 160 f., 162 



Spiraster (a spire of one or more turns, 

 produced on the outside into several 

 spines), 222 



Spirillina, 59, 64 



Spirochaeta ( = Treponema, 111), 120 f. ; 

 " S." zeemannii, 120 f. ; & obermeieri, 

 121 



Spirochona, 138 ; adoral wreath of, 138 n. ; 

 bud-fission of, 147 



Spiroloculina, 59, 63 



Spirostomum, 137, 153 f. ; supposed nervous 

 fibrils in, 143 



Spongelia, 225 



Spongelidae, 220 



Sponges ( = Porifera), 163 f. ; spicules, 170 

 171, 172, 177 f., 183, 184, 187 f., 198 f. 

 222, 224, 231 f., 232 ; canal system, 

 170, 171, 191, 198, 210, 235 f. ; physi 

 ology, 234 f. ; distribution, in space 

 239 ; in time, 241 ; history, 166 ; re 

 production, 172, 226 f. ; nervous system 

 39 ; immune from Gregarines, 99 ; rela 

 tions to Protista, 41 ; to Choanoflagel 

 lates, 122 f., 168, 181 



Sponge -sand, a source of Foraminiferal 

 tests, 62 



Sponge -spicules, in arenaceous shell of 

 Foraminifera, 64 see also Spicules 



Spongicola ( = Nausithoe), 206, 318 ; S. 

 Jistidaris, 317 ; (a Decapod Crustacean), 

 206 ; S. venusta, 206 



Spongidae, 220 



Spongilla, 217, 225, 230, 232, 237, 238 ; 

 S. lacustris, spicule, 232 



Spongin, 176, 217, 239 



Spongioderma, 351 



Spongocardium gilchristi, 215 



Spongodes, 330, 335, 348, 349 



Spongophare, 210 



Spontaneous, generation, 42 f. ; rendered im- 

 probable by life-histories of Flagellates, 

 118 : movements of Protista, 23 



Sporadopora, 284, 285 



Sporange ( = a sac containing spores), of 

 Myxomycetes, 91 f. ; of Bidymiura, 92 ; 

 of Actinomyxidiaceae, 98 



Spore, 31 ; of A ctinophrys, 72 ; of A ctino- 

 sphaerium, 73 f. ; of Acantharia, 86 n. ; 

 of Myxomycetes, 90 f. ; of Didymiurn 

 difforme, 92 ; of Sporozoa, 94 f. ; of 

 Gregarinidaceae, 97 f. ; of Lankesteria, 

 95 ; of Gregarina blattarum, 98 ; of 

 Stylorhynchus, 100 ; of Coccidiaceae, 97 ; 

 of Coccidiidae, 97 ; of Coccidium schu- 

 bergi, 101 ; of malarial parasites, 104 ; 

 of Acystosporidae, 97 ; of Myxospori- 

 diaceae, 98, 107 ; of Myxobolus mulleri, 

 107 ; of Actinomyxidiaceae, 98 ; of 

 Sarcosporidiaceae, 98, 108 ; of Bodo 

 saltans, 117 ; of Flagellates highly re- 

 sistant to heat, 118 see also Oospore, 

 Zoospores, Zygotospore 



Sporocyst, 88, 89 ; of Proteomyxa, 88 ; of 

 Bodo saltans, 117 f. 



Sporoducts of Gregarina blattarum, 98 f. 



Sporogony, 296 



Sporont of Gregarines, 98 f. 



Sporozoa, 31, 33, 40, 48, 50, 94 f. ; forma- 

 tion of chromidia, 29 f. ; habitat, 48 ; 

 relations, 48 f. ; movements, 50, 125 n. ; 

 Acystosporidae most primitive group of, 

 106 ; distinction from Flagellata, 109 



Sporozoite, 95 f. ; of Lankesteria, 95 ; of 

 Coccidiaceae, 99 f., 101 ; of Haemo- 

 sporidae, 102 ; of Acystosporidae, 104 f. 



Sporulation, 31 ; in Noctiluca, 133 f. ; 

 = Brood-formation, q.v. 



Springer, on classification of Crinoidea, 589 



Springing movements, of Flagellates Dallin- 

 gsria, 114, and Bodo saltans, 114, 117 ; 

 of tailed Ciliata, 141 n. ; of Pleuro- 

 nema, 154 



Spumellaria (Peripylaea), 76, 76 f., 77 ; 

 skeleton, 77, 83 



Spyroidea, 78 



Squamulina, 59, 65 





