VLATE XXI. 55 



state of preservation, and for affording a good view of 

 both surfaces of the sponge by the large natural 

 folding of the expanded surface of the sponge. The 

 Rev. A. M. Norman has a specimen of this species 

 formed of two sponges which have grown together at 

 their margins, and each of these has a folding of their 

 proximal margins so, as it were, to avoid touching each 

 other as much as possible. The width of the double 

 specimen is seven inches, and the height of the largest 

 one four inches. 



Figs. 14, 15. Two of the skeleton spicula from the 

 axial column. X 80 linear. 



Figs. 16, 17. An acerate and an acuate spiculum 

 from the ramuli. X 80 linear. 



These two forms of spicula are common to the 

 dermal surface as well as to the ramuli. 



