PLATE 43. 



Geodia ovis Lendenfeld. 

 Figures 1-8. 



1-8. — Cladomes of mesoproclades and teloclades; magnified 100; phot. Zeiss, apoehr. 16, compens. oc. 6: 



1, of an irregular mesoprodiaene; 



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



3, 4, of quite regular mesoprotriaenes; 



5, of a quite regular mesopromonaenc ; 



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



7, of a prodiaene; 



8, of an irregular mesoprotriaene with one clade reduced to a rounded knob, and another much elon- 



gated. 



Geodia ataxastra Lendenfeld. 



Figs. 9-25, 28-38. — var. angustana Lendenfeld. 

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



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

 16, compens. oe. 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. Zeiss, 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. angustana; magnified 10; phot. Zeiss, planar 50: 



a, cortex; b, choanosome. 



26. — An afferent pore-sieve of var. latana; 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 group of efferent pore-sieves of var. angustana; magnified 30; phot. Zeiss, planar 20. 



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

 q. oc. 10: 



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

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

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



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



monochr. 1.7, q. oc. 10. 



36. — Part of a large thick-rayed oxyaster of var. angustana; magnified 1890; 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. oc. 10. 



