42 LORD HOWE ISLAND. 



The purple-blue fan-shaped growths of Iantliella probably grow to a con- 

 siderable size at Lord Howe. Several varieties of the sponge of commerce 

 occur, and are used by the Islanders. They are, however, small. The tufts 

 of Cacospongia are the most numerously represented. 



Protozoa. — We found that the beach sand, besides comminuted coral, and 

 some shell detritus, is to some extent composed of Orbitolites complanahcs, 

 Lamk., and either Tinoporus or Calcarina. The latter is that peculiar 

 radiated, tuber-like Poraminifer discovered by the late Prof. J. B. Jukes, in 

 Torres' Straits. 



E. ETHEKIDGE, Jtjne. 



