574 STUDIES ON SPONGES. 



Fig. \\. — Raphyriis Hixonii. E. v. L. 



Bulb ac. spicule. The head showing a spine. 



1:250 magnified. 

 Fig. 12. — Raphyrus Hixonii. R. v. L. 



Bulb ac. spicule, with a large spine. The head. 



200:1 magnified. 

 Fig. 13. — Raphyrm Hixonii. R. v. L. 



Bulb ac. spicule, the truncate end showing the extended terminus 

 of the axial canal. 



1:500 magnified. 

 Fig. 14:. — Rajjhyrufi Hixonii. R. v. L. 



Tr. tr. sp. spicule of the dermal armour. Straight kind. 



1 :700 magnified. 

 Fig. 15. — Raphyrus Hixonii. R. v. L. 



Tr. tr. sp. spicule of the dermal armour. Curved kind, 



1:700 magnified. 

 Fig. 16. — Rajjhyrus Hixonii. R. v, L. 



Ac. ac. sp. spicule of the soft tissue. 



1:400 magnified. 

 Fig. 17. — Raphyrus Hixonii. R. v. L. 



Tr. ac. spicule. 



150:1 magnified. 



Plate 43. 

 Fig. 18. — Chalinopsis imifatus. R. v. L. 



Photographed from a skeleton. 



J of the natural size. 

 Fig. 19. — Dactylochalina cylindrica. R. v. L. 



Photographed from a skeleton. 



\ of the natural size. 



Plate 44. 

 Fig. 20. — Chalinopsis dichotoma. R. v. L, 



Photographed from a skeleton. 



^ of the natural size. 

 Fig. 21, — Dactylochalina reticulata. R, v, L, 



Photographed from a skeleton, 



J of the natural size. 



