INDEX 



To names of Classes, Orders, Sub-Orders, ami Genera ; to technical terms ; and to 

 names of Authors discussed in the text. 



Acanthascinae, diagnosis 



and genera, 122 

 Acantluiscus, 122 

 Acanthactinella, 123 

 Acantlidla, 153 

 Acanthin, 43 

 Acanthodictya, 123 

 Acanthometridae, 43 

 Acanthorrhaphis, 153 

 Acanthosaccus, 122 

 Acarnus, 138, 152 

 acerate spicules, 101 

 Acervochalina, 151 

 Acheliderma, 152 

 Aciculina, 78, 146 



diagnosis and classifica- 

 tion, 150 



Acicidites, 149 

 acrepid, 135 

 actinoblast, 40, 107 

 aesthacytes, 47 

 Agdas, 152 

 alate spicules, 102 

 Alectona, 151 

 Algol, 148 

 Ammoconia, 154 

 Ammoconidae, diagnosis 



and genera, 154 

 Ammolynthus, 154 

 A mmosolenia , 154 

 amoebocytes, 28, 58, 62, 



72, 85, 120 

 amoeboid movement in 



collencytes, 52 

 Amorphinopsis, 153 

 amphiaster, 134 

 Aniphiastrella, 152 

 amphiblastula, 75, 81, 145 

 Amphibleptula, 149 

 amphidisc, 138 

 Amphidiscophora, 121 



(footnote) 



diagnosis and classifica- 

 tion, 122, 123 



amphidiscs, 65, 117 



Amj)hilectus, 152 

 A ri tph isponyia ,123 

 Amphisponyidae, 123 

 amphitriaene, 134, 146 

 Amphius, 150 

 Amp/mite, 110 

 Amphoriscidae, diagnosis 



and genera, 110 

 Anijilniriscus, 110 

 Anamixilla, 110 

 auatriaene, 133 

 Ancorina, 148 

 Anisoxya, 150 

 Anomocladidae, 149 

 Anomocladinae, 149 

 Anomodonella, 149 

 Anomodonellidae, 149 

 Auoplia, diagnosis and 



classification, 149, 150 

 Antares, 148 

 Anthastra, 148 

 aphodal type of canal 



system, 35, 130 

 aphodus, 34, 127 

 Aphcmne, 122 

 Aphrocallistes, 124 

 apical formative cell, 107 



ray, 101 



Aplysilla, 44, 64, 78, 154 

 Aplysillidae, 141, 144, 153 



diagnosis and genera, 

 154 



Aplysina, 26, 154 

 Aplysinidae, diagnosis and 



genera, 154 

 apopyles, 33 

 aragonite, 167 

 archaeocytes, 31, 57, 62, 



63, 69, 73, 75, 80, 83, 



84 



Archaeoscyphia, 149 

 Archaeoscyphidae, 149 

 arenaceous sponges, 42, 



144 

 Artemisina, 152 



i articulated tubar skeleton, 



105 



Ascaltis, 110 

 Ascandra, 54, 55, 94, 100, 



110 



Ascetta, 109, 110 

 Asconema, 7, 122 ' 

 Asconematidae, diagnosis 



and genera, 122 

 Ascons, 7, 31, 51, 59, 64, 



85, 89, 90, 92, 109, 110, 



157, 160 



Ascyssa, 109, 110 

 aster, 117, 134 

 A steractinella, 156 

 Aster opus, 150 

 Astraeospongia, 154 

 Astroboiia, 150 

 Astrocladia, 149 

 Astroconia, 123 

 Astromimus, 151 

 Astropeplus, 150 

 Astrophora, diagnosis and 



classification, 147, 148 

 Astrosdera, 166 

 Astrosderidae, 168 

 Astylomanvn, 150 

 Astylospongia, 150 

 Astylospongidae, 150 

 Atractosdla, 153 

 attachment, mode of, in 



sponges, 2 

 Aulascus, 122 

 Aulaxinia, 148 

 Aulena, 152 

 Auletta, 153 

 Aulocalyx, 122 

 Aulodwne, 122 

 Aulocopidae, diagnosis and 



genera, 149 

 Aulocopium, 149 

 Aulocystis, 120, 124 

 Aulosaccus, 122 

 autodermalia, 118 

 autophya, 37 



