MONOGRAPn OF THE LABOrLBEXIACF.T:. 217 
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tlie opening in the diaphragm into the cavity of the neck, and flils profrndod portion, 
having reached a definite size, becomes separntod as a free mass of profoplnsm, "wliich, 
having been, as a ride, moulded to a cjlindiical form in (lie cavity of tlio neck, makes its 
exit through the terminal pore. When free, the endogenous anflierozoids exactly re- 
semble bacilli or cocci in appearance, becoming rounded at the cuds so that the short 
forms are almost spherical (Plate I, fig. 2G ; Plate VI, fig. 5 ; Plate 11, fig. 2; Plate III, 
fig. 19). Their substance is refractive and homogeneous, and I have been unable, by 
staining, to differentiate a definite nucleus. Although, ^vhcn first separated from the 
contents of the venter, they are undoubtedly naked protoplasmic masses, in some 
cases at least a thin wall seems to be secreted around them after their exit from the 
antheridial cell. In Enarthromyces, for example, ^vhich possesses antherozoids larger 
than those of any other known form, such a wall appears to be present, and the same 
may very probably be the case in other forms in which the antherozoids are so minute 
that exact observations In this respect are made with difficulty, even after they have 
become attached to the trichogyne. When freshl}^ discharged (hoy are usually sufTi- 
ciently characteristic in appearance to he readily distinguished from the bacteria and 
yeasts which are often so numerous on certain individuals as to completely corticate 
the appendages. 
The discharge of the antherozoids from the antheridial cell is a slow process^ and 
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probably does not occur more frequently than once every two or three hours; at 
least this is about the rate observed in individuals Avhich have been separated from 
the host and placed in water. It may be, however, that the rate is more rnpid under 
natural conditions; since the parasite does not survive very long after separation from 
the host, which doubtless disturbs not only its nutrition, but also its general turges- 
cence. From the secondary neck of compound antheridia the discharge is, of course, 
often much more rapid at times, and a dozen or more antherozoids may be seen to 
make their exit within a few minutes after an individual of Camptomyces. for ex- 
amj^le, has been mounted in water. Cultures of the antherozoids in water, continued 
for many days, have never shown any indication of an attempt at development. 
Eeference has already been made to the duration of the active period of the anthe- 
ridia, and it remains to note the fact that the numbers of antherozoids formed during 
this period from a single antheridium must be counted by hundreds, or even thou- 
sands, in the case of the more highly-developed compound forms. 
Female SlxuoI Organs. — It has been previously mentioned that in a majority of 
forms the antheridial appendage is developed from the terminal cell of the germina- 
ting spore. The femal 
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Liys formed from the prod 
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