Coker: Two New Species of Water Molds 
287 
few of the outermost gently rocked themselves away a little distance from 
the main mass and then settled down. The spores that remained in a mass 
at the tip of the sporangium also showed a very slight rocking movement, thus 
proving the presence of cilia, but in a couple of minutes they became quite 
still. In the other sporangium the spores charged out with great rapidity and 
everyone dashed rapidly away. 
A sporangium emptied at 11:13 and all the spores sank slowly to the 
bottom of the dish separating themselves considerably by a gentle rocking 
motion. After settling, individuals would move spasmodically at intervals, 
turning and jerking, but none swam actively or any distance. This interrupted 
movement continued for at least a half hour after emergence. 
The existence of cilia thus indicated by the behavior of the 
spores was demonstrated by treatment with potassium iodide solu- 
tion at the moment of emergence. A sporangium so treated is 
shown in fig. 4. All the spores can be distinctly seen to have cilia. 
From these observations it will be seen that the behavior of the 
spores in Achlya paradoxa has no parallel in the genus. 
In figs. 5, 6, 7, 8, a series of oogonia are shown with normal 
variation. Oogonia without stalks and with their bases formed 
from a section of a hypha are not at all rare (fig. 5.) The varia- 
tion in size of the oogonia is extreme. The smallest are not more 
than 23 ix, in diameter, the largest may reach 74 /*. 
Slender upgrowths into the oogonium from the partition below 
are occasionally seen. Such growths often appear in other species 
of Saprolegnia and Achlya, but, while they give the effect of 
antheridial tubes, they are usually quite functionless. The anther- 
idia themselves are peculiar. They are sudden enlargements of the 
tips of the antheridial branches and are short, thick and tuber- 
like. They often proliferate, and usually by growth from near 
the base of the antheridial cells themselves. These outgrowths 
are then cut off as separate antheridia (figs. 7 and 8). When 
first formed the antheridia are well filled with protoplasm and con- 
trast strongly with the almost colorless branches that bear them. 
Later the antheridia appear almost empty as if they had dis- 
charged their contents into the eggs. This, however, was not 
actually observed. Chlamydospores unlike the oogonia, are not 
rare, but appear plentifully, though not densely, in almost all 
cultures. The majority terminate short branches and approximate 
the oogonia in size, shape and position (fig. 9) : others are ar- 
ranged in chains (fig. 10) which are usually curved or contorted. 
