PLATE 39. 



Geodia japonica (Soll\s). 



Figures 1-41. 



1_9._ Small dermal rliabds (amphioxes); magnified 300; phot. Zeiss, apoehr. 4, compens..oc. 6. 

 10-12.— Groups of small strongj'losphaerastcrs and a single one from a centrifugal spieule-preparation; 



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

 13._ Group of spicules from a centrifugal spieule-preparation ; magnified 300; phot. Zeiss, apoehr. 4, 

 compens. oc. 6: 



a, large oxyasters; b, small strongylosphaerasters; c, a raiimte dermal anaclade. 

 14-17.— Minute dermal anaclades; magnified 300; phot. Zeiss, apoehr. 4, compens. oc. 6: 

 14, 15, with well-developed eladoraes; 

 16, 17, with reduced eladoraes. 

 18-24. — Large oxyasters; magnified 300; phot. Zeiss, apoehr. 4, compens. oc. fi. 

 25, 26.— Parts of large oxyast«rs; magnified 1800; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10. 

 27. — Group of asters from a centrifugal spieule-preparation; magnified 54t); u. v. phot. Zeiss, q. mon- 

 ochr. 6, q. oc. 10: 



a, large oxyaster; b, small strongylosphaerasters. 

 28-32.— Sterrasters; magnified 300; phot. Zeiss, apoehr. 4, compens. oc. 6: 

 28, 29, en face views with the umbilicus near the centre of the upper side; 

 30-32, profile \-iews with the umbilicus at or near the margin. 

 33.— A large oxy.sphaeraster ; magnified 1800; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10. 

 34, 35.— The umbilical part of the surface of a sterraster; magnified 1800; u. v. phot. Zeiss, q. monochr. 

 1.7, q. oc. 10: 

 34, focused higher; 35, focused lower. 

 36, 37.— Two strongj-losphaerasters from a centrifugal spieule-preparation; magnified 1800; u. v. 

 phot. Zeiss, q. monochr. 1.7, q. oc. 10: 

 36, focused lower; 37. focused higher. 

 38, 39.— Cladomes of minute dermal anaclades; magnified 1000; phot. Zeiss, hom. imm. apoehr. 2, 



compens. oc. 6. 

 40, 41.— Large oxysphaeraster; magnified 1800; u. v. phot. Zeiss, q. monochr. 1.7, q. oc. 10: 

 40, focused higher; 41, focused lower. 



