PLATE 43. 



Geodia ovis Lgndgnfelo. 

 Figures 1-8. 



1-8. — Cladomesof mesoprocladesand teloclades; magnified 100; phot. Zeiss, apochr. 16, corapens. oc. 6: 



1 , of an irregular mesoprodiaene ; 



2, of an irregular plagiotriaene with clades convex towards the rhabdome; 



3, 4, of quite regular mcsoprotriaenes; 



5, of a quite regular mesopromonaene ; 



6, of an irregular mesoprotriaene, with one elongated clade; 



7, of a prodiaene ; 



8, of an irregular mesoprotriaene with one clade reduceti to a rounded knolj, ami another much elon- 



gated. 



Geodia ataxastra Lknuenfeld. 



Figs. 9-25, 2S-3S. — var. angustana Lendenpeld. 

 Figs. 26, 27. — var. latana Lendenfeld. 



9-14. — Cladomes of orthotriaenes (plagiotriaenes) of var. angiistana; magnified .50; phot. Zeiss, apochr. 

 16, compens. oc. 2: 



9, of a young one; 



10, of an adult, somewhat irregular one ; 

 11-14, of adult regular ones. 



15-22. — Orthotriaenes of var. angustana; magnified 20; phot. Zei.ss, planar 20. 



23, 24. — Groups of megascleres from .spicule-preparations of var. angustana; magnified 20; phot. Zeiss, 



planar 20: 



a, orthotriaene; b, mesoprotriaene; c, anatriaenes; d, large amphioxes. 

 25. — Part of a radial section of var. anyiistatui; magnified 10; phot. Zeiss, planar 50: 



a, cortex; b, choanosome. 

 26. — An afferent pore-sieve of var. lalana; magnified 100; phot. Zeiss, apochr. 16, compens. oc. 6. 

 27. — Group of megascleres from a spicule-preparation of var. latana; magnified 20; phot. Zeiss, planar 



20: 



a, orthotriaenes; d, large amphioxes. 

 28. — A gi'oup of efferent pore-sieves of var. angustana; magnified .30; phot. Z'/iss, planar 20. 

 29-32. — Large oxysphacraster of var. angustana; magnified 1800; u. v. phot. Zeiss, q. monochr. 1.7, 



q. oc. 10: 

 29, focu.sed higher; .30, focused lower: 31, focused still lower; 32, focused lowest. 

 33, 34. — Groups of small strongylosphacrasters from a centrifugal spicule-preparation of var. angustana; 



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

 35. — Part of a large slender-rayed oxyaster of var. angustana; magnified ISOO; u. v. phot. Zeiss, q. 



monochr. 1.7, q. oc. 10. 

 36. — Part of a large thick-rayed oxyaster of var. angustana; magnified 1800; u. v phot. Zeiss, q. 



monochr. 1.7, q. oc. 10. 

 37. — Group of spicules from a centrifugal spicule-preparation of var. angustana; magnified 1800; u. v. 



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



a, part of a large thick-rayed oxyaster; b, small strongylosphaeraster. 

 38. — Part of a large thin-rayed aster of var. angustana; magnified 1800; u. v. phot. Zeiss, q. monochr. 



1.7, q. 00. 10. 



