PLATE 47. 



Geodia acanthtylastra Lendenfeld. 



Figures 1-8. 



1, 2.— Large acanthtylaster; magnified 1800; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10: 



1, focused higher; 2, focused lower. 

 3._ Group of asters from a centrifugal spiculc-preparat ion; magnified 1800; u. v. phot. Zeiss, q. 

 monochr. 1.7, q. oc. 10: 



a, small strongylosphaeraster; b, large acanthtylasters. 

 4_(5._ Acanthtylasters; magnified 1800; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10. 

 7.— Group of asters from a centrifugal spicule-preparation; magnified 1800; u. v. phot. Zeiss, q. mon- 

 ochr. 1.7, q. oc. 10: 



a, small strongylosphaeraster; b, large acanthtylaster. 

 8.— Large acanthtylaster; magnified 1800; u. v. phot. Zeiss, q. monochr. 1.7, q oc. 10. 



Geodia lophotriaena Lendenfeld. 



Figures 9-36. 



9_2l.— Side views of lophotriaenes and plagiotriaenes; magnified .50; phot. Zeiss, apochr. 16, compens. 

 oc. 2: 

 9-12, 14,19, lophotriaenes with more or less irregular cladomes and long simple, pointed rhabdomes; 

 13, 15, 16, 18, dichotriaenes with regular cladomes and long pointed rhabdomes: 

 17, plagiotriaene; 



20, lophotriaene with bifurcate rhabdome; 



21, plagiotriaene with shortened and terminally roundeti rhabdome. 

 22. — The sponge seen from above; magnified 3.5; phot. Zeiss, anastig. 167. 



23.— Radial section through the superficial part of the sponge; magnified 100; phot. Zeiss, apochr. 16, 

 compens. oc. 6: 



a, dermal membrane; b, sterraster-armour ; c, choanosome. 

 24.— Radial section through the superficial part of the sponge; magnified 10: phot. Zeiss, planar 50: 



a, cortex; b, choanosome. 

 25-33.— Cladomes of dicho- and other lophotriaenes seen from below (the rhabdome is directed verti- 

 cally upwards); magnified 50; phot. Zeiss, apochr. 16, compens. oc. 2: 

 25-29, cladomes of dichotriaenes; 



30, 33, cladomes of lophotriaenes with one trifurcate and two bifurcate clades; 



31, cladomes of a lophotriaene with one bifurcate, one trifurcate and one quaterfurcate clade; 



32, cladome of a lophotriaene with one quaterfurcate and two trifurcate clades. 

 34. — Mesoprotriaene; magnified 50; phot. Zeiss, apochr. 16, compens. oc. 2. 



35, 36. — Cladomes of anatriaenes; magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6. 



