PLATE 20. 



Geodia amphistrongyla Lendenfeld. 

 Figures 1-41. 



5, 6.- Cfeclomes'of anatriacnes; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6: 

 5, with smaller clade-rhabdome angle; 

 fi with larger clade-rhabdome angle. 

 7. 8.-Cladome' of mesoproclades, magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6: 



7 of a niesopromonaene ; 

 9_krt of^raltZ'through the distal portion of the choanosome, shoving a cluster of young 



st^rrasters in situ; magnified 200; phot. Zeiss, apochr 8, compens. oc. 6 

 10 - Cladome of an anatriaene; magnified 300; phot. Ze.ss, horn mm., apochr. 2. 

 1-Cladomeofananatriaene; magnified 100; phot. Ze.ss, apochr. 16, compens. oc. 6^ 

 •> - Large choanosomal oxyaster; magnified 450; u. v. phot. Ze.ss, q. monochr. 6, q^ oc. 10. 

 is; 14 -farts (rays) of large choanosonxal oxyasters; magnified 750; phot. Ze.ss, hom. num. apochr. 



15, 16.- pTMraj^tof large choa,.o.so.nal oxyasters; magnified 1800; u. v. phot. Zeiss, q. monochr. 



17.-OnI'L°of fcyhndrical amphistrongyle with thicke.fings; magnified 200; phot. Zeiss, apochr. 



18-21.- ^nhoalLal rhabds a,.d parts of such; magnified 100; phot. Zeiss, apochr. 100, com- 



pens oc. 6.: 

 18, a short anisoactine, somewhat style-like amph.strongyle ; 

 19' a larger, nearly isoactine, cylindrical amphistrongyle; 

 20', the rounded end of a large style (the pointed end of this spicule is represented m F.g. -1 , 



21 the pointed end of a large style (the rounded end of this sp.cule .s represented in F.g. .0) 

 22-25.- Cladomes of plagiotriaenes and derivates of such: magnified 100; phot. Ze.ss, apochr. 16, 



compens. oc. 6: 



22 cladome of a regular plagiotriaene with short clades; 



23! cladome of a plagiomonaene with normal rhabdome and simple clade; 

 24, an orthodichomonaene with shortened rhabdome; 

 25^ clado.ne of a regular plagiotriaene with long clades. 

 26-30.— Groups of microscleres from a centrifugal spicule-preparation ; magnified .300: 

 26-28, 30, phot. Zeiss, apochr. 4, compens. oc. 6; 



29, phot. Zeiss, hom. imm. apochr. 2; „ , . ,„„„. a 



a, large choanosomal oxyasters; b, large oxj'sphaerasters; c, small strongylosphaerasters, d, 



young sterrasters. 

 31 _ View of the sponge; magnified 1.1; phot. Zeiss, anastig. 480/412. 

 32.- Group of sterrasters from a spicule-preparation; magnified 200; phot. Zeiss, apochr. 8, compens. 



33.- Radial section through the superficial part of the sponge; magnified 20; phot. Zeiss, planar 



20: 



a cort<"x; b, a chone; c, subcortical cavities; d, choanosome. 



34-36.- Small strongylosphaerasters, two single ones and a group, from a centrifugal spicule-prepa- 

 ration; magnified 1800; u. v. phot. Zeiss, monochr. 1.7, q. oc. 10. , , y • 

 37, 38.— The umbilicus of a sterraster and the adjacent parts; magnified ISOO; u. v phot, ^e.ss, q. 

 monochr. 1.7, q. oc. 10: 

 37, focused lower; 38, focused higher. -71 rr, 

 39.- Radial section through the superficial part of the sponge; magnified 10: phot. Zeiss, planar au. 



a, cortex; c, subcortical cavities; d, choanosome. 

 40, 41. Part of the surface of the side of a st^^rraster; magnified 1800; u. v. phot. Ze.,ss. q. monochr. 

 1.7, q. oc. 10: 

 40, focused lower; 41, focused higher. 



