21,1 Shaw: Merrillosphaera 117 
outer membrane m by a thick gelatinous wall w. The space 
within the outer membrane of a typical cell is hemispherical in 
its outer half and hexagonally prismatical in its inner half, with 
a somewhat convex inner side. The protoplast is well within 
the outer half of the space. The outer membranes of the pris- 
matical portions of neighboring cells are united to form what 
has the appearance of a middle lamella that is thickened at the 
corners k. A peripheral membrane 7 of the coenobium covers 
an intercellular space system 0, that is filled with an intercellular 
substance, between the hemispherical parts of the somatic cells. 
The gonidia were described as reaching diameters as great 
as 50 », and dividing either before or after the birth of the 
coenobia containing them. Cells similar to the gonidia were 
Fig. 1. Protoplasts and membranes of the body cells of Merrillosphaera tertia (Meyer) Shaw. 
a, tangential optical section at about the level of the middle of the outer half of the cell; 
b, similar section at about the middle of the inner half of the cell; c, diagrammatic radial 
section through body cells, The peripheral lamella, p, of the coenobium covers the inter- 
cellular space, o, filled with an intercellular mass, between the outer lamellae, m, of the 
neighboring body cells. Each protoplast is separated from the outer lamella of its wall 
by a thick gelatinous wall, w. After Meyer. 
Said to become dark green and become transformed into oospores 
when they reached diameters of 40 to 50 ».- The fertilization 
Was supposed to take place while the coenobia containing the 
eggs were still within their mothers. The antheridia were 
produced in the reproductive halves of the male coenobia. The 
androgonidia segmented when 13 » in diameter. Each produced | 
a hemispherical or tabular bundle of spermatozoids while the 
male coenobium was yet within its mother. The oospores that 
Were supposed to have been seen were described as having 
Smooth walls. 
Fuller accounts of both Merrillosphaera migulae and M. tertia 
will be needed before we shall be in a position to make a final 
decision as to whether the organisms represented by these names 
properly belong in the same or in different species. With our 
