PLATE 41. 



Geodia ovis Lendenfeld. 



Figures 1-20. 



1-20. — Aster.s and parts of such; magnified 1800; u. v. phot. Zeiss, q. monochr. 1.7, compens. oc. 10: 

 1, 2, small strongylosphaerasters; 



3, thin-rayed oxyaster; 



4, strongj'losphaeraster; 

 5-8, medimn strongj'lasters; 



9, group of asters from a centrifugal spicule-preparation; 



a, small, thick-rayed aster; b, oxyaster with thin, more cylindrical rays; 



10, 11, group of asters from a centrifugal spicule-preparation; 



10, focu.sed higher; 11, focused lower; 



a, small thick-rayed aster; b, large thick-rayed oxyaster with one ray bifurcate; 



12, oxyaster with rays intermediate in thickness; 



13, M, large strongylaster; 



13, focused higher; 14, focused lower; 



15, large oxyaster with slender rays; 



16, large oxyaster with thick rays; 



17, part of a large oxj'aster with thick rays; 



18, a ray of a large thick-rayed oxj-aster; 



19, a ray (the left below) of the large thin-rayed o.xyaster represented in Fig. 15, focused lower; 



20, a ray of a large thick-rayed oxyaster. 



