42 LOUD HOWE ISLAND. 



Tlie purple-blue fan-shaped growths of lanthella probably grow to a con- 

 siderable size at Lord Howe. Several varieties of the s])onge 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 Orhitolltes complanatus, 

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

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

 Torres' Straits. 



E. ETHEEIDGE, Junr. 



