Treatise on Invertebrate Paleontology: Archaeocyatha and Porifera. 1955

abdomen aboral end aboral horn Acantharina Acanthometridae alveoles apical horn apophyses arms aspinal pores axis basal feet Basal shell mouth BORGERT branched BRANDT by-spines Calif Cam.-Rec central capsule cephalis chamber cilia collar columella concentric lattice shells conical cortical shell Cret Cret.-Rec cupolas Cystidium Dev.-Rec dissimilar distally double medullary shell emend Eoc.-Rec equatorial spines Family faunas fenestrated forked fossils genera girdle Haeckel Heliozoa heliozoans HERTWIG irregular JÖRG Jur.-Rec lacks apical horn lorica Main spines margin Mio.-Rec MÜLLER Nassellina Network regular Ord.-Rec partim patagium Phaeodarina plate Plio polar spines pole Pores regular pyramidal radial ribs radial spines radial tubules Radiolaria Rec.FIG Rüst sagittal ring SD herein similar simple skeleton solid species spherical spicules spines or thorns spines unbranched spiral Spumellina structure Subfamily Suborder Superfamily Surface smooth surface spiny sutural thorax thorny Tintinnina Tintinnus Trias.-Rec U.Eoc VINASSA