PHAHOPHYCEA 67 
a protoplasmic layer which is connected by fine 
threads with the layer lining the wall. The chro- 
matophores vary slightly in shape, being flat discs 
usually round but frequently elongated. 
The Reproductive Organs—The larger unilocular 
bodies which occur in all three genera contain but one 
oosphere each, unprovided with cilia, and having in the 
Fic, 10.—a, Scaphospora speciosa, with antheridia and presumptive oogonia, 
b, Haplospora globosa, with presumptive oogonia: highly magnified. 
case of Scaphospora one nucleus, Haplospora four, and 
Tilopteris two or more. In Tilopteris and Haplospora it 
is clothed with a membrane before emission, but in 
Scaphospora the wall is not secreted until after it is 
set free. In Tilopteris these bodies are intercalary 
in the filaments, and occur in pairs or in fours; in 
Haplospora they are shortly stalked ; and in Scapho- 
spora they are partly immersed in the branches, one 
of the cells of which acts as a basal cell. If we 
F 2 
