PLATE III. 

 " HYMENIACIDON HILLIERI, BowerbanJc. 



Fig. 1. Represents the sponge in the condition in 

 which it came from the sea. Natural size. 



Fig. 2. A subspinulate spiculum from the skeleton. 

 X 158 linear. 



Fig. 3. An acuate skeleton spiculum. X 158 

 linear." 



" HYMENIACIDON SOLIDUS, Bowerbank. 



Fig. 4. Represents the sponge in the dry state. 

 Natural size. 



Fig. 5. A small portion of the reticulate, dermal 

 membrane. X 94 linear. 



Fig. 6. One of the fusiformi-acerate spicula of the 

 dermal rete and of the skeleton. X 158 linear. 



Fig. 7. Two of the slender acerate spicula of the 

 skeleton. X 158 linear. These spicula are frequently 

 more or less flexuous." 



