in der Spougiologie währeud der Jahre 1888 — 1891. 225 



Gen. Astropeplus n. g 

 Group II: Heterosclera Sollas. Spintharophora in which megascleres are 

 always pi'esent and sometimes also microscleres. 

 Demus I: Centrospinthara Sollas. Heterosclera in which the micro- 

 sclere when present is a euaster. 

 Farn. Axinellidae (O. Schm.). The ectosome is not a cortex, the 

 mesoderm of the choauosome is collenchymatous, the 

 chamber-system is eurypylous. The skeleton consists of 

 axial übres and radial fibres proceeding from them to the 

 surface. The megascleres are styles and rhabdi, which 

 inay he isoactinate or anisoactinate, or both. The micro- 

 sclere when present is a spheraster or oxyaster or stron- 

 gylaster (in one genus, Tricentrium, the aster is sometimes 

 a microcalthrops). 

 Gen. Hymeniacidon (Bwk.), Phacellia (ßwk.), Ciocalyi)ta (Bwk.), 

 Acanthella (0. Schm.), Axinella (0. Schm.), Raspailia 

 (Nardo), Dendropsis Ridl. Dendy, Trinacophora Ridl. 

 Dendy, Dictyocylindrus Bwk., Epallax n. g. Hemi- 

 asterella Gart. 

 Farn. Dorypleridae Sollas. The ectosome is not a cortex, and the 

 choanosome not regnlarly folded, the mesoderm is collen- 

 chymatous. The megascleres are oxeas arranged without 

 Order. The microsclere is a large oxyaster. 

 Gen. DoryjDleres n. g. 

 Farn. Tethyidae Vosra. The ectosome is a well-differentiated cortex 

 with a distinct fibrous layer. The megascleres are stron- 

 gyloxeas, radially arranged. The microscleres are sphe- 

 rasters, but other forms of euaster are frequently present. 

 Gen. Tethya Lm., Columnitis O. Schm., Xenospongia Gray (?), 

 Magog n. g. (?). 

 Demus II: Spiraspinthara Sollas. Spintharophora in which the micro- 

 sclere IS some form of spiraster. 

 Fam. Scolopidae Sollas. The ectosome is a thin fibrous cortex, 

 contaiuing oxeas and microxeas closely and radially 

 arranged. The megascleres are oxeas, mostly collected 

 in fibres, radially arranged. The microsclere when present 

 is an amphiaster. 

 Gen. Scolopes n. g., Stylocordyla W. Thoms. 

 Fam. Suberitidae (0. Schm.). The ectosome is a more or less 

 distinctly differentiated cortex, with a skeleton of micro- 

 styles radially arranged, palisade fashion. Microscleres 

 are usually absent (except microstyles); in two species — 

 Suberites ficus (Bwk.) and S. virgultosa (Bwk.), which 

 are possibly identical, a centrotylote microstrongyle occurs, 

 The megascleres are tylostyles. 

 Gen. Suberites (Nardo), Polymastia (Bwk.), Protelcia Ridl. Dendy, 

 Trichostemma Sars, Tentorium Vosm., Quasillina (Norm.), 

 Cliona (Grant). 



Ärch f. Natm-gesch. ,Tahig.l890. Bd.II. H.3. 15 



