1886.] POSITION AND CLASSIFICATION OF SPONGES. 
With lithistid irregular tetraxon spicules ...... 18. 
(With tetraxon spicules of irregular shape ; 
askeletous forms with large chambers, which 
16 have large outlets ............sscsecrecesseeerevees (19.) 
* ') With monaxon tylostylote spicules .......--.....- (20.) 
Without supporting spicules; flesh-spicules 
| when present polyact, with small chambers 
\ which have narrow outlets ..........ceeeeeeeee (21.) 
Spicules quite irregular  ...........seesceseeeeerees 18. Rhizomorinide. 
Spicules rod-shaped, with terminal tufts of 
branches 
wee eee eee ewer e ee ee rata ee nesses eae eeeeee 
Spicules tetractin, with terminal branches...... 
19. Anomocladinide. 
20. Tetracladinide. 
ANd candelabras ......:c.s.cecsessoncecscssoessvers 
There are large tetract spicules with three 
equal rays lying tangentially in or beyond the 
surface, and one difterentiated, radial ray .. 
With small inconspicuous ciliated pe 
with small outlets 
With large conspicuous ciliated chambers with 
Wide OWGLSEA. ae ccvecbcctcscnsecncodeescenssrsevdenae 
With candelabra 
With simple tetracts 
(19.) 
bo 
to 
bo 
= 
22. 
(23.) 
2. 
(25.) 
. Corticide. 
2. Pachastrellide. 
seas eeeee 
With scattered tetracts, triacts, diacts 
(25.) ) Without spicules 
{ The spicules are chiefly tetracts with equal rays 
Tetracts with differentiated large centripetal 
ray and large tangential rays numerous ...... 
Tetracts with differentiated large centripetal 
ray rare, with small tangential rays 
26 { Withispherastons'\..-55¢42sce-ccewasana cect -uesses eh: 
“* | Without spherasters 
(23.) 
( Flesh-spicules euaster and oxyaster 
28. } Flesh-spicules spirastrella  ...........ccscseeeeeeee 
Flesh-spicules spirula and sigmata 
seen e ree eeneeee 
(27.) Without flesh-spicules 
Peewee eee eet a rene aeeeneee 
bundles divide the regular subdermal cavities 
into ectochonz or vestibules at the entrance 
of the inhalant canals 
Peer errr r eee e reer e errr ress 
( 
| 
Om) at 
{canals 
eRe eCEUe ECOSOC OCOCOOeCe CSE e eee eee e errr rer) 
With spirastrellid flesh-spicules 
29. 4 With sigmate flesh-spicules 
Without flesh-spicules 
Sete we rene ene ennee 
A Ree meee eee eee eweeee 
eee e ewww en eneee 
With polyact flesh-spicules 
Gl) { Without flesh-spicules 
eee eee eee Cec eee rere rere res 
23. Plakinide. 
24. Oscarellide. 
26. 
(27.) 
. Geodide. 
28. 
. Stellettide. 
27. Theneide. 
28. Tetillide. 
Tethyopsillide. 
The widened distal ends of the radial spicule- 
. Lethyde. 
. Sollasellide. 
29. 
. Sptrastrellide, 
. Suberamatide. 
Suberitide. 
35. Chondrillide. 
36. Chondroside., 
591 
