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Plate 10. 



Fig. 1. Sclerothamnopsis compressa. From a photograph ; \. 



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2. Bathyxiphus, sp. From a photograph. A small piece has been taken out, and 



the two parts fastened together with a pin ; \. 



3. Sclerothamnopsis compressa. From a photograph ; \ . 



4. Hexactinella labyrinthica. Scopula; upper and lower ends; x 600. 



5. Chonelasma calyx F. E. Sch. (sp.?). From a photograph.. Sponge wall cut away 



so as to show septum ; \, 



6. Hexactinella labyrinthica . From a photograph ; \. 



Group of slender, spinose hexacts and pentacts, 

 partially fused ; x 300. 



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