416 



In its outer appearance and colour M. testarum, ^, 

 resembles entirely ConchoceUs rosea Batters^), from which it is 

 only distinguishable by the microscopic examination. The plant 

 (only found once) has been dredged from 12 fathoms water in 

 Kattegat off Herthas Flak by Dr. Kolderup Rosenvinge ; it was 

 contained in a shell of Bosiiiia exoleta. 



^) Ed w. A. Batters: On Conchocelis, a new genus of perforating 

 Algae in Phycological Memoirs edited by George Murray, Part I, 

 1892. 



