PLATE 2. 



Geodinella robusta Lendenfeld. 



Figs. 1,3. — var. megasterra Lendenfeld. 

 Figs. 2, 8. — var. megaclada Lendenfeld. 

 Figs. 4-7, 9-lL — var. carolae Lendenfeld. 



1. — Group of sterrasters in a spicvile-preparation of var. megasterra; magnified 100; phot., Zeiss, apochr. 



16, compens. oc. 6: 



a, sterrasters of the usual ellipsoidal form lying flat: b, a three-lobed sterraster lying flat. 



2. — Group of sterrasters in a spicule-preparation of var. megaclada ; magnified 100; phot., Zeiss, apochr. 



16, compens, oc. 6: 



a, sterrasters of the usual ellipsoidal form lying flat; b, a three-lobed sterraster lying flat; 

 c, a sterraster of the usual ellipsoidal form standing on one of its longer narrow sides. 



3. — Group of euasters in a centrifugal spicule-preparation of var. megasterra; magnified 300; phot., 



Zeiss, apochr. 4, compens. oc. 6: 



a, oxyaster; b, strongylosphaerasters. 

 4 — Part of a section of the choanosome of the specimen of var. carolae from Charlotte Sound; congo- 

 red, aniline-blue; magnified 350; phot., Zeiss, hom. imm. 2, compens. oc. 2: 



a, surface view of a flagellate chamber with sparse collar cells; b, sectioned flagellate chambers. 



5. — Group of sterrasters in a spicule-preparation of the specimen of var. carolae from Charlotte Sound; 



magnified 100; phot., Zeiss, apochr. 16, compens. oc. 6: 



a, sterrasters lying flat; c, a sterraster standing on one of its longer narrow sides. 



6. — Radial section of the specimen of var. carolae from Charlotte Sound; magnified; phot., Zeiss, 



planar 50: 



a, cortex (sterraster-armour) ; b, choanosome; c, wide choanosomal canals. 



7. — Part of a section of the choanosome of the specimen of var. carolae from Charlotte Sound; congo- 



red, aniline-blue; magnified 300; phot., Zeiss, apochr. 4, compens. oc. 6: 

 a, ova; b, connective tissue forming capsules enclosing the ova. 



8. — Group of strongylosphaerasters in a centrifugal spicule-preparation of var. megaclada; magnified 



300; phot., Zeiss, apochr. 4 compens. oc. 6. 



9. — Group of strongylosphaerasters in a centrifugal spicule-preparation of the specimen of var. carolae 



from Charlotte Sound; magnified 300; phot., Zeiss, apochr. 4, compens. oc. 6. 



10. — Group of euasters in a centrifugal spicule-preparation of the choanosome of the specimen of var. 



carolae from Charlotte Sound; magnified 300; phot., Zeiss, apochr. 4, compens. oc. 6: 



a, large oxyaster; b, small oxyaster; c, small sphaeraster. 

 IL — Part of a section of the choanosome of the specimen of var. carolae from Charlotte Sound; congo- 

 red, azm-e; magnified 300; phot., Zeiss, apochr. 4, compens. 6: 



a, flagellate chambers. 



