DESCRIPTION OF FIGURES ON PLATE I. 

 RECENT SILICEOUS SPONGES 



(BRIGHTON MUSEUM), 



One-Fourth Natural Size. 



1 Corallistes, a siliceous Sponge from Barbadoes. 



2 Pheronema Grayi, a singular Sponge dredged off the coast 



of Portugal, and found at depths of from 2,000 to 

 3,000 feet. The roots are a tangled mass of fine hair- 

 like fibres of silica. 



3 Hyalonema Sieboldii, dredged in Pacific Ocean, particularly 



off the coast of Japan. The long root is of beautiful 

 glass-like threads of pure silica. 



4 Euplectella aspergillum, commonly known as Venus' 



flower-basket. This, the most beautiful of sponges, is 

 found at depths of from 1,000 to 2,000 feet in several 

 parts of the Pacific. 



5 Patuloscula precumbens. Australia. 



6 Caulospongia plicata. A Sponge with spiral convolutions 



similar to forms often observed in Flint. There is a 

 good example of this, near the specimen figured, in the 

 Museum. 



