` | General Notes. ra 
{Mesoderm thin, sii a irregular 
2. Mesoderm thin, radial cylindrical chambers 
des, Mesoderm thick, og hard ohn b 
With cylindrica cal c cha 
3:4 With s ne 
Chambers opening directly into gastral cavity Sya 
4. J Chambers opening into exhalent canals which lead into the gastral 
cavity Sylleibide. 4 
Exhalents lead into oscular tubes Leuconide, 
‘5.4 Exhalents fete direct on one side of the lamellar sponge; inhalent 
pore her side exclusive ely df: ore 
6. Vith ARE spicules and thimble-shaped cha 
{Without hexact spicules; with spherical or res: ed chambers.. s.. 
P 
The spicules remain isolate T r partly coalesce, afterwards ‘megan 
7 . he supporting spicules early coalesce in a regular dictyonid manner... 
8. is exaster in the interior. i 
4 ROS but amphidis 
rmalia hetact, i, with centripetal radial ray “the 
lon als est: pinnul æ 
9. a in tie ual and dermal surfaces 
. Dermalia Aang’ ag ray; no pinnulz 
Jo. With numerous davai wo : 
i With uncinates... 
al “ ease 
5 With radially iaat clavu ~ O 
With Nr give situated scopulze ERE E 
| 3 Branc and anastomosing tubes; the skeleton-net forming several 
yers Py . Euret. 
Bra nching tubular or calyculate, honeycombed ; -cavities “traversed by 
13 Jeon monhe an eia aatas aE i Meli 
% | Calyculate or expanded, een f augit ss by funnel-shaped canals _ 
mS À ning cates on one o r surface.. i ‘i i i aoe 
nals irregu spia tr: s eleton o à 
Deis aversing the ube dictyona jh ide 
14. Meandrically winding tubes spuds 
(Wi ith c artilaginous ground-substance and spherical chambers i 
a jaien hist, tylostylote, or oat er cement : 
spong Askeletous forms with spherical c amberseni i 
15.4 With ol ground: aie a spherical or sac-shaped cham 
ever tylostylote, cemented with spongin. 
4 composed of horny fibre without proper here Aske 
F With lithistid irregular tetraxon x fg JOS. sishevedizcseqenmaetneesnee? 
With tetraxon spicules of irregular shape askeletous “forms 
16. - heart ers, which have large outlets arena © 
on t Jipii: a E gata 
Without ce ee spicules ; fesh-spicules when prestat, poy“ 
| _ _ small chambers which have narrow ou 
-f Spicules quite irregular = 
17. 4 Spicules rod-shaped, with Rik ra Salts ar tranche! e 
es a tetractin, with termin Vese boeeee, Tetras 
spicules chiefly tetracts, rhai e won eal can causes oan h beyond 
18. ET tetract raia. with heg equal rays lying daen nor à 
the sleet and one differentiated radial ray..se.sessesereetere tt 
= 3-1 Win inconspicuous ciliated c eken with small out 
With jarge conspicuous ciliated chambers with wide outlets. 
t With can PEE E i 
Eoas emmy tetr; EVITOS A e Pach, ; 
‘ith scattered t seen tri diacts R 
Without s ed EE ien 
du 
creppp ote eoteeeneerrs ” 
erous sexes oid 
| sac with differentiated large centripetal ray n Tare, 
sansa 
