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 



PIG. 10. a, Scapliosporn speciosa, with antheridia and presumptive oogonia. 

 ft, Ilaplogpora globosa, with presumptive oogonia : highly magnified. 



case of Sccuphospora one nucleus, Haplospora four, and 

 Tiloptcris 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 Scaplio- 

 spora they are partly immersed in the branches, one 

 of the cells of which acts as a basal cell. If we 



