Reproduction of Cy stop us Caudidus , Ldv. 299 
portions, each of which shows in the centre a small feebly- 
coloured vacuole. 
Some minutes after the division, the papilla swells, opens, 
and the zoospores are pushed to the outside through the 
opening one by one, without giving the least sign of move- 
ment ; they take a lenticular form, and group themselves 
before the opening of the sporange in a globular mass. They 
soon commence to move, vibratile cilia show themselves and 
the whole mass is set oscillating, the zoospores ultimately 
become free and move away through the liquid. The zoo- 
spores are of the form of a plano-convex or slightly concavo- 
convex lens. Under the plane or concave surface is a disc-like 
vacuole, and the cilia are attached on the edge of the vacuole, 
a short one in front, a long one behind, both on the same side. 
The generation of zoospores in the sporangia commences in 
2 1 to 3 hours after being placed in water. They appeared 
always in sporangia recently formed, or which had been kept 
a month and a half. But sporangia which were kept longer 
than that would not produce zoospores, and did not develop 
in any other way. 
The oospores only change after a repose of several months. 
The oospore becomes a large sporange : placed in water the 
epispore bursts and the endospore protrudes. It contains 
a mass of protoplasm in which are to be seen several large 
vacuoles, which are constantly changing in form and volume. 
Soon this fluctuation is stopped, and in an instant the whole 
protoplasm is divided into polyhedral portions similar to the 
zoospores produced in the conidia. The endospore swells up 
to a much larger size and ultimately the zoospores are grouped 
in this vesicle in the form of a globular mass, which offers 
nearly the same phenomenon as in the case of the ordinary 
zoospores. Finally the spores separate from one another ; for 
some minutes they swarm in the vesicle, then this bursts and 
disappears and the zoospores become free in the surrounding 
water. 
The number of zoospores thus produced is very considerable ; 
it is almost impossible to count them, but one may fairly 
