590 
(4.) With cylindrical chambers 
*? | With spherical chambers ...........sssecosseeseeees 
{css radial, opening direct into gastral 
Fees ee ree eee eaeseneereae 
cavity 
Chambers opening into exhalant canals which 
lead into the gastral cavity 
( Exhalants lead into oscular tubes 
Renee nema anew meee eee meet eee ee teen es eeeeee 
5 
Exhalants open direct on one side of the lamel- 
lar sponge; inhalant pores on the other 
side exclusively 
(6) 
Sete eee e tees er renters e eee eeeennene 
DR. R. VON LENDENFELD ON THE SYSTEMATIC [Dec. 2], 
4. Syconide. 
5, Sylleibide. 
6. Leuconide. 
7. Teichonide. 
With hexact spicules and thimble-shaped 
2 Chambers J sas aeacks eke cetaueeegensencem ders tee Ue 
(4) Without hexact spicules, with sac-shaped or 
P i 
spherical chambers) <.....idc-senesco.es1eeceeves (8.) 
The spicules remain isolated or partly coalesce 
7 afterwards irregularly ............coesesseeeeceee 9. 
* ) The supporting spicules early coalesce in a 
regular Dictyonid manner ..............0se006- (10.) 
9 Hexaster in the interior .............sccesseeseeeee UF 
: | No hexasters, but amphidises ..............0.cc00- (12.) 
( Hypodermalia hexact sword-shaped, with centri- 
1 petal radial ray longest; no pinnule......... 8. Luplectellide. 
Pinnulz in the gastral and dermal surfaces... 9. Asconematide. 
Dermalia without centripetal ray; no pinnule 10. Rossellide. 
(12.) ‘With numerous pinnulee ..............02-cseeeeeees 11. Hyalonematide, 
10.) Whith imneinates!;: ces cacsctascevasensvetetusteceuesaas 13. 
(10-) | Without uncinates ....s.s-scssssseseseserseseseeer (14.) 
13 With radially situated clavule ...............04. 12. Farreide. 
* | With radially situated scopulee ...........-.06. 15. 
( Branched and anastomosing tubes ; the skeleton- 
| net forms several layers ............se0esescees 13. Euretide. 
Branching tubular or calyculate, honeycombed ; 
cavities traversed by reticular membrane ... 14. Melittionide. 
15. 4 Oalyculate or expanded, traversed transversely 
| by funnel-shaped canals opening alternately 
on one or other surface ...........-...s0seeeee- 15. Coscinoporide. 
Canals irregular, traversing the dense dictyonal 
| skeleton obliquely or longitudinally ......... 16. Tetrodictyide. 
(14.) Meandrically winding tubes ................06.6 17. Meandrospongide. 
With cartilaginous ground-substance and sphe- 
vical chambers. Spicules polyact, tetract, 
lithistid, tylostylote, or stylote, never ce- 
mented with spongin. Askeletous forms 
with spherical chambers .................:00000- 16. 
(8.) 4 With soft ground-substance, spherical or sac- 
shaped chambers, Spicules monaxon, never 
tylostylote, cemented with spongin. Or ske- 
leton composed of horny fibre without proper 
spicules. Askeletous forms with sac-shaped 
chambers 
Senter reese ee Come reece eres eererteeeneren 
