176 



INDEX TO THE PORIFERA 



Rhagon, 61, Vll, 1^5, 164 

 Rhuphidistiiu, 150 

 Rhuphklorus, 151 

 lilMxella, 148 

 lihizaxinella, 151 

 Rhizochalina, 152 

 Rliizomoriiia, 148-150 

 lih izojjotcrion, 1 25 

 Jihopalospongia, 149 

 RiillcUt, 151 

 Ridley, 157 

 Rimella, 148 

 Roemer, 155 

 root tuft, 3, 41, 88, 118 

 rosette, 117 



— cells, 80 

 Rossella, 122 

 RosseUidae, diagnosis and 



genera, 122 

 Rossellinae, diagnosis and 



genera, 122 

 Rostanga, 88 



Sarcocalt/x, 122 



sagittal triradiates, 101 



Aim IIS, 147 



-saiiidaster, 134 



S<i II u/a.steri7ia, d iaguosis 



and genera, 148 

 >Saiiidasin'/la, 148 

 sareenchynia, 52 

 Savile-Kent, 55, 89. 158 

 Scfptriiitii.s, 151 

 Scfiaudiiinia, 121, 122 

 SchizorhaMiis, 125 

 Suhniidt, 14:3, 165 

 ydiulze, 42, 44 (footnote), 



52, 62, 64, 76 (footnote), 



111, 120, 121, 127. 135, 



143, 156, 159, 162, 165 

 Scleritodennu, 149 

 ikleritodermidae, diagnosis 



and genera, 149 

 sclerobliists, 27, 39, 47, 53, 



62, 107, 120 

 Srkrochulina, 151 

 Sclenihdia, 124 

 Scleropleijma, 124 

 Sclerothamiiiis, 124 

 Si'olapes, 150 

 soopula, 117, 118 

 Hcopulari.o, diagnosis and 



(.hissiticutioii, 123, 124 

 Scjipltidium, 122 

 Snjtalia, 149 

 second type of canal 



system, 32 

 secondary cell dilferentia- 



tion, 73 



— spicules, 40, 131, 134 



— symmetry. 23 



segmentation of ovum, 67, 



68, 73 

 Seiriola, 148 

 Seliscothon, 150 

 Semisuberites, 151 

 Semjierella, 123 

 iScmpt'relluiae, 123 

 sensitiveness, 87 

 sessile sponges, 4 

 Sesirocladia, 125 

 Sestrodictyon, 124 

 Sestrostomella, 106, 111 

 Selidium, 149 

 sheath of spicule, 40, 100 

 Sidcrodcriiia, 152 

 sieve membraneof osculuni. 



27 

 signia, 138 

 si'iraaspire, 134 

 tiigmateUa, 152 

 Sigmatophora, diagnosis 



and classification, 147 

 SiginaxineUa, 153 

 Siiicea, 162 

 siliceous spicules, 40 



— spicules, origin of, 161 

 Siphonia, 13, 148 

 Siphoniditnn, 149 

 Siphonochalina, 1 51 

 skeletal spicules, 39, 100, 



137 

 skeletogenous cells, 85 



— layer, 46 



— stratum, 31. 51, 62, 71 

 skeleton, 27 



— in general. 37-43 



— of Cakarea, 100-107 



— of Deniospongiae, 130- 

 144 



— of Hexactiuellids, 118- 

 120 



— of Keratosa, 140-144 



— of Monaxonida, 137-140 



— of Telraxonida, 130-137 



— origin of, 161 



smooth cortical skeleton, 



105 

 S .lias, 44, 47, 52, 58, 135, 



148, 158, 1.59 

 S„UaseU(u 153 

 Sollas's nuMnhrane, 56 

 SpanUijihin, 152 

 s]K'rmatocyst, 60 

 spermatocj-te, 60 

 spcrmatogentjsis, 60 

 spermatogonium. 60 

 sph.ieraster, 134 

 Sfihaeni.ipoiigia, 1 23 

 Sp/iaeruli/liix, 151 

 SpheiHiulii.r, 124 

 ' Sphenophorinii, 110 



spherule, 167 

 sphincter, 27, 36, 46, 48 

 SphinctreUa, 147 

 spicular system, 40 

 spicule, definition of, 41 

 spicules, 27, 71 



— calcareous, 40, 100 



— development of, 40 



— formation of, in Calcarea, 

 107, 108 



— mori)hology of, 37 



— of JJarwineUa, 141 



— of Hexactinellids, 116- 

 118 



— of Monaxonida, 137, 

 138 



— of Octactinellida and 

 Heteractinellida, 155 



— of Tetr.ixonida, 131-135 



— organic axis of, 40, 100, 

 116, 118, 167 



— origin of. 161 



— sheath, 40, 100 



— siliceous, 40 

 Spiculispongiae, 146, 163 

 Spiitosella, 151 

 Spiractinella, 123 

 Spirastrella, 43, 151 

 Spirastrelliilae, diagnosis 



and genera, 151 

 Spiroxya, 150 

 Spongelia, 154 

 Spongeliidae, 142, 144 



— diagnosis and genera, 

 153, 154 



Spongiaila, 88 



Spoitgidae, diagnosis and 



genera, 153 

 Spongil/a, 42, 51. 53, 56, 



58, 61, 80, 82, 86, 89, 



151, 159 

 SpiiviilUime, 1, 25, 65, 67. 



137, 138 



— diagnosis and genera, 

 151, lf.2 



spongin, 138, 163 



-- chemical nature, 41 



— fibres, 26 

 spongoblasts, 42, 46, 62 



138, 141 

 spongocl.-usts. 141 

 SjiDiigiidixciis, 149 

 spongoj)hare. 126 

 Spoiigd.iorih's, 1 50 

 spongozoon, 89 

 Spiiriidopjilc, 124 

 Sporadoscin ia, 1 25 

 sporaster, 134 

 Staiiiyspatigia, 150 

 stalk, 3 



S/,nn>„ri,>.„. 1 .'.4 



