254 ARTHUR DENDY. 



Fig. 5.— Sycon gelatinosum. Portion of a tangential section, cutting 

 across the radial chambers. Drawn under Zeiss C, ocular 2. 



Fig. 6.— Sycon gelatinosum. Portion of a tangential section of the 

 dermal surface showing the tufts of nail-shaped oxea which crown the distal 

 ends of the radial chambers, and the pore-bearing membrane stretched between 

 them. Drawn under Zeiss C, ocular 2. 



Fig, 7. — Sycon boomerang. Portion of a transverse (horizontal) sec- 

 tion, showing one much-branched radial chamber. Drawn under Zeiss A, 

 ocular 2. 



Fig. 8. — Sycon boomerang. Portion of a tangential section of the 

 dermal surface, showing the tufts of oxea which crown the distal ends of the 

 radial chambers, and the pore-bearing membrane (containing a few spicules) 

 stretched between them. Drawn under Zeiss C, ocular 2. 



PLATE 11. 



YiG. 9. — Grantia extusarticulata. Portion of a transverse (hori- 

 zontal) section. Drawn under Zeiss A, ocular 2. 



Fig. 10.— Grantia Vosmaeri. Portion of a longitudinal (vertical) sec- 

 tion. Drawn under Zeiss A, ocular 2. 



Fig. 11. — Grantiopsis cylindrica. Portion of a transverse section. 

 Drawn under Zeiss A, ocular 2. 



Fig. 12. — Ute syconoides. Portion of a transverse (horizontal) sec- 

 tion. (The majority of the spicules have been dissolved out by the action of 

 acid alcohol, but the large oxea of the dermal cortex are shown cut across.) 

 Drawn under Zeiss C, ocular 2. 



Fig. 13. — Ute syconoides. Portion of a tangential section cutting 

 across the radial chambers. Drawn under Zeiss C, ocular 2. 



Fig. 14. — Ute syconoides. Portion of a tangential (longitudinal) sec- 

 tion, passing above through the dermal surface and below through the dilated 

 distal cuds of the radial chambers. Drawn under Zeiss A, ocular 2. 



PLATE 12. 



Fig. 15. — Synute pulchella. Portion of a transverse (horizontal) sec- 

 tion, showing the central gastral cavities of three Ute individuals, each sur- 

 rounded by radial chambers and all together invested in a common cortex. 

 Drawn under Zeiss A (with the bottom lens removed), ocular 2. 



Fig. 16. — L eucandra phillipensis. Portion of a transverse (horizontal) 

 section. Drawn under Zeiss A, ocular 2. 



Fig. 17. — Leucandra australiensis. Portion of a transverse (hori- 

 zontal) section. Drawn under Zeiss A, ocular 2. 



