PLATE 18. 



Geodia variospiculosa Thiele. 



Figs. 1-7, 9, 11, 12, 21, 23-26.— var. micraster Lendenfeld. 

 Figs. 8, 10, 13-20, 22, 27. — var. intermedia Lendenfeld. 



1.— Large hexactine oxyaster of var. niuraster; magnified .300; u. v. phot. Zeiss, q. monochr. 6, q. oc. 7. 

 2.— Group of asters from a centrifugal spicule-preparation of var. micraster; magnified 300; u'. v. phot! 

 Zeiss, q. monochr. 6, q. oc. 7: 



a, large triactine oxyaster; b, smaller oxyasters; c, small strongj'lo.sphaerasters. 

 3.— Large^hexactine oxyaster of var. micraster; magnified .300; u. v. phot. Zeiss, q. monochr. 6; q. 



oc. / 



4 



Large triactine oxyaster of var. micraster; magnified 300; u. v. phot. Zeiss, q. monochr. 6, q. oc. 7. 

 5.— Group of spicules from a centrifugal spicule-preparation of var. micraster; magnified 300; phot! 

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



c, small strongylosphaerasters; d, large monactine oxyaster; e, parts of dermal styles. 

 6.— A large monactine oxyaster of var. micraster; magnified 300; phot. Zeiss, hom. imm. apochr. 2. 

 7.— Group of asters from a centrifugal spicule-preparation of var. micraster; magnified 300; phot. Zeiss, 

 apochr. 4, compens. oc. 6: 



b, smaller oxyasters; c, small strongylosphaerasters. 

 8.— Part of a radial section through the subcortical layer of var. intermedia; magnified 100; phot. 

 Zeiss, apochr. 16, compens. oc. 6: 

 a, cortical sterra.ster-armour ; b, bundle of radial megascleres; c, a subcortical group of small 

 dermal styles: d, cladome of an anatriaene. 

 9.— View of part of the surface of var. micraster, showing a pore-sieve; magnified 75 ; phot. Zeiss, apochr. 

 16, compens. oc. 6. ' ' ' 



10.— Group of spicules from a centrifugal spicule-preparation of var. in^crmerfia; magnified 300; phot. 

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



a, large triactine oxyaster; b, small oxyast«r; c, small strongylosphaerasters; f, oxy.sphaeraster. 

 11.— Group of small strongylosphaerasters from a centrifugal spicule-preparation of var. micraster; 



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

 12.— A small oxyaster of var. micraster; magnified .300; phot. Zeiss, apochr. 4, compens. oc. 6. 

 13.— An ox-ysphaeraster of var. intermedia; magnified .300; u. v. phot. Zeiss, q. monochr. 6, q. oc. 7. 

 14.— Group of asters from a centrifugal spicule-preparation of var. intermedia; magnified 300; u. v. 



phot. Zeiss, q. monochr. 6, q. oc. 7: 



b, smaller oxyaster; c, small strongylosphaerasters. 



15-20.— Large oxyasters of var. intermedia; magnified 300; u. v. phot. Zeiss, q. monochr. 6, q. oc. 7: 



15, 17, 19, large pentactine oxyasters; 



16, a large triactine oxyaster; 

 18, 20, large tetractine oxyasters. 



2K— Radial section through the superficial part of var. micraster; magnified 10; phot. Zeiss, planar 

 50: 



a, sterraster-armour; b, achone; c, .subcortical cavities; d, choanosome. 

 ^"•~ ^^''* °f 1 '■adial section of the proximal portion of the choanosome of var. intermedia; magnified 

 200; phot. Zeiss, apochr. 8, compens. oc. 6: 

 a, large oxyasters; b, smaller oxj'asters. 

 23.— Part of a radial section of the proximal portion of the cortex of var. micraster, passing through a 

 (closed) chonal canal; magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6: 

 a, oxysphaerasters surrounding the (closed) chonal canal. 

 24.— Part of a radial section through the distal portion of the cortex and the spicule-fur of var. micraster; 

 magnified 200; phot. Zeiss, apochr. 8, compens. oc. 6: 

 a, minute dermal anaclades: b, rhabdome of a large protruding anatriaene; c, surface of the 

 sponge. 



