PLATE XXVIL 
PAGE 
Caminus spheroconia, . 
214 
re 1. Sponge ; nat. size. 
2. Vertical median section through one lobe, showing the general character 
of the excurrent canal system ; nat. size. 
3-9. Spicules — 
10. Part of the section seen at the left hand upper corner of the cloaca in 
fig. 2, more highly magnified; x 4. 
11. Tangential but slightly oblique section through the ectochrote, showing 
at the left hand side the pores, to the right the cavities into which 
they open ; x 14. 
12. Tangential section through the sterrastral layer; x 14. 
13. Transverse section through the cortex and part of the choanosome ; 
14. Transverse section through the ectochrote ; x 292. 
15. Section through a part of the choanosome, showing the aphodal character 
of the chamber-system ; x 180. 
16. Similar, showing the spherules in situ (within cells not distinguishable 
from sarcencytes) ; x 430. 
17. A flagellated chamber seen en face, showing the fenestrated membrane; 
X 430. 
18. A young sperm cell ; x 292. 
19. A sperm-cluster, showing the residual nucleus in the midst ; x 292. 
20. A sperm-cluster ; x 292. 
21. Isolated spermatozoa ; x 430. 
Mg. 3. Strongyle; x 125. 
„ 4. Ortliotriaeiie ; x 125. 
„ 5. Sterraster; x 125. 
„ 6. Somal spherule ; x 430. 
Mg. 7. Exceptionally large somal 
spherule ; x 430. 
„ 8, 9. Composite spherules, consist- 
ing of two or more united 
together; x 430. 
X 14. 
22. Section showing the sarcenchyme, with spherules in some of the sarcen- 
cytes ; X 430. 
