90 PLATE XXXV. 



remarkable specimen is in a fine state of preservation, 

 and it is probable tbat the species is of rapid growth as 

 the shell, Fusus Islandicus ? is in as fresh a state as if the 

 animal had but recently been living in it; the peri- 

 ostracum being in a perfect state of preservation. 

 The spoon-shaped expansion of the distal extremity 

 of the sponge is the only instance of the assumption 

 of such a form among the species that I have yet seen. 

 The figures are from the dried specimen of the natural 

 size. 



Fig. 4. — One of the skeleton spicula. X 250 

 linear. 



Fig. 5. — A group of three of the inflato-cylindrical 

 spicula of the dermal membrane. X 530 linear. 



