INDEX TO THE PORIFERA 



177 



Staniioma, 154 

 Stannowidae, 142, 143 

 — diagnosis and genera, 



154 

 Stannoj^hyllum, 154 

 statocj-tes, 60, 62, 65 

 StanradineUa, 123 

 Staurocahjptus, 122 

 Stauniderma, 124 

 Staunxlcrmidae, 124 

 Staurwlerminoe, 124 

 Stauronema, 124 

 SteUetta, 43, 128, 148 

 Stellettidae, diagnosis and 



genera, 148 

 Stelliyera, 153 

 Stellisjyongia, 111 

 Stelospongus, 142, 153 

 StejiluDioscypJiHs, 88 

 ster raster, 134 

 Sterrastrosn, 148 

 Stewart, 47 

 Stichiijjhyma, 150 

 stomions, 127 

 Stro.mbergia, 111 

 streptaster, 134, 138 

 Streptasterida4>, diagnosis 



and genera, 150 

 Strejitastrosa, 147 

 strongylote, 137 

 Strt/2}hnus. 148 

 Stuckenhergia, 149 

 style, 133 

 Stylocordyla, 151 

 Stylocordylidae, diagnosis 



and genera, 150, 151 

 Stylostichon, 152 

 Stylotdla, 152 

 Stylot r ich oph or a , 152 

 stylus, 116, 137 

 subcortical crj'pt, 129 

 subdermal cavities, ] 28 



— trabecular layer, 112 

 Suberites, 88, 151, 157 

 Suheritidae, 140 



— diagnosis and genera, 

 151 



Sitberotelites, 152 

 subgastral trabecular layer, 



112 

 Sulcastrella, 148 

 Sycantha, 110 

 Sycetta, 110 

 Sycetlidae, 111 



— diagnosis and genera, 

 110 ^ I. 



Sm>it, 8, 27, 48, 55, 56, 

 61, 76, 77^ 81, 82, 100, 

 105, 107, 110 



syconoid type of canal 

 system, 96, 97 



Sycons, 90, 92, 96, 109 



Syculwis, 110 

 Sycyssa, 110 



symmetry, secondary, 23 

 Sympogella, 122 

 Sympyla, 149 

 synajtticula, 119 

 syncytium theory, 62 

 synocils, 47 

 Sywpdla, 111 

 Syiiops, 148 

 Syringella, 153 



Taegeria, 122 



Taegerinae, diagnosis and 



genera, 122 

 Tedonio, 152, 156 

 Teganium, 123 

 TeichoneUa, 110 

 Tentorium, 13, 20, 36, 151, 



167 

 Terpios, 151 

 tertiary cell differentiation, 



73 

 Tetliya, 64, 67, 150 

 Tethyidae, 133. 138 



— diagnosis and genera, 

 150 



TethyopsiUa, 147 

 Tethyopsis, 148 

 Tethyorrhcqyhis, 150 

 TetiUa, 127, 128, 147 

 Tetillidae, diagnosis and 



genera, 147 

 Tetroxlculidae, diagnosis 



and genera, 148 

 tetracrepid, 135 

 tetractiual, 38, 116 

 tetractine, 132 

 Tetractinelli<la, 1, 3, 78. 



132, 146, 157 



— diagnosis and classifica- 

 tion, 147-150 



tetralophous, 134 

 TetrantMla, 153 

 tetraxon spicules, 38, 132 



— spicules, origin of, 135, 

 162 



Tetraxonia, 162, 164 

 Tetraxouida, 1, 145, 146, 

 163 



— diagnosis and cla.ssifica- 

 tion, 146-150 



— skeleton, 130-137 

 Thcdaranpora, 111 

 Thdvinnspongia, 149 

 Theccqthora, 151 

 Thecosipkonia, 149 

 Thenea, 147, 157 

 Tlitneidae, diagnosis and 



genera, 147 



I Theonella, 148 



I thesocytes, 58, 59, 62 



I third type canal system, 



i 33 



! Tholiasterella, 156 



I Thoosa, 151 



Thorectd, 154 



Tlirinacophora, 153 

 I Thrombus, 147 



Thymosiu, 147 

 i tokocj-tes, 58, 59, 62, 83 

 I Topsent, 49, 59, 65, 67 

 j 127, 144, 165 



toruote, 137 



Toulminia, 124 



toxa, 138 



Toxochalina, 151 



trabeculae, 112, 120 



Trachya, 150 



Trachycaulus, 122 



Trachycladus, 150 



Troxhysimia, 111 

 : Trachysycon, 148 

 ' Trachytedaaia, 152 

 , Trugusui, 153 

 i Tremadidyon, 124 

 ; Tremaididium, 149 



Tretodictyidae, diagnosis 

 and genera, 124 



Trdohqjhvs, 149 



triactinal, 38 



— spicules, 101 

 triaene, 132, 135 

 triaenes, 162, 163 

 Triaenosa, 148 

 triaxon spicules, 38 



— origin of, 162 

 I Triaxonia, 111, 162, 164 

 I Trihruchion, 13, 148 

 I Trichasterina, 122 

 I Trichospongia, 153 



Trichostemvia, 151 

 1 Trikentrion, 138, 153 



trilophous, 134 

 I tripods, 104 

 I Triptolemus, 147 

 i triradiate spicules, 101 

 ' — spicules, formation of, 

 107 



Trochobolus, 125 

 I Trochospoiigilla, 151 

 I trophocytes, 58, 62 

 ' Tuba, 151 



tubar skeleton, 105 



— system, 93 

 TuMla, 152 

 Tidjcrdla, 150 

 tuning-fork spicules, 106 

 Turonia, 149 

 tylhexactine, 117 

 Tyfosii/iiia, 152 



