| OCR Text |
Show 590 DR. R. VON LENDENFELD ON THE SYSTEMATIC [Dec. 21, (4 ) { With cylindrical chambers * '' [With spherical chambers ... 5. (6.) (6.) Chambers radial, opening direct into gastral cavity 4. Syconidce. Chambers opening into exhalant canals which lead into the gastral cavity 5. Sylleibidm. " Exbalants lead into oscular tubes 6. Leuconidce. Exbalants open direct on one side of tbe lamellar sponge; inhalant pores on tbe other side exclusively 7. Teichonidce. (2.) 7. 11- '•{ With hexact spicules and thimble-shaped cbambers Without hexact spicules, with sac-shaped or spherical cbambers Tbe spicules remain isolated or partly coalesce afterwards irregularly The supporting spicules early coalesce in a regular Dictyonid manner Hexaster in tbe interior N o bexasters, but ampbidiscs Hypodermalia hexact sword-shaped, with centripetal radial ray longest; no pinnulse Pinnulse in the gastral and dermal surfaces ... Dermalia without centripetal ray; no pinnulae 7. (8.) 9. (10.) 11. (12.) 8. Euplectellidce. 9. Asconematidce. 10. Eossellidce. (12.) With numerous pinnuhe 11. Hyalonematidce. n ft "> I With uncinates "* ''\ Without uncinates 13. f With radially situated clavulas \ With radially situated scopulae ' Branched and anastomosing tubes; tbe skeleton-net forms several layers Branching tubular or calyculate, honeycombed; cavities traversed by reticular membrane ... 15. \ Calyculate or expanded, traversed transversely by funnel-shaped canals opening alternately on one or other surface Canals irregular, traversing the dense dictyonal skeleton obliquely or longitudinally 13. (14.) 12. Farreidce. 15. 13. Euretidce. 14. Melittionidce. 15. Coscinoporidce. 16. TetrodictyidcB. (14.) Meandrically winding tubes 17. Meandrospongida. (8.) ' With cartilaginous ground-substance and spherical cbambers. Spicides polyact, tetract, lithistid, tylostylote, or stylote, never cemented with spongin. Askeletous forms with spherical chambers 16. With soft ground-substance, spherical or sac-shaped chambers, Spicules monaxon, never tylostylote, cemented with spongin. Or skeleton composed of horny fibre without proper spicules. Askeletous forms with sac-shaped cbambers (17.) |
