198 STEIL: THE ANTHEROZOID OF THE GENUS RICCARDIA 
The major portion of the body consists of a long rod-like 
homogeneous-staining nucleus extending to almost the posterior 
part of the body, where it gradually tapers to a point. The 
extreme posterior portion consists of a cytoplasmic structure 
which also tapers to a sharp 
point. This is the vesicle which 
usually becomes more densely 
stained than the remainder of 
the cytoplasmic portions. <A 
cytoplasmic band or filament 
extends from the vesicle for some 
distance towards the anterior 
end where it becomes gradually 
narrower. It was difficult to 
determine its forward limit. A 
study of spermatogenesis al- 
ready begun will, no doubt, aid 
in deciding this doubtful point. 
At the anterior end of the 
body are attached the cilia; one 
a short distance from the end, 
and the other some distance 
farther back. The cilia are of 
unequal length, the posterior 
one being considerably longer 
than the other. The fact that 
the cilia are attached at differ- 
ent points and are of unequal 
length is of interest, since in 
these two respects the anthero- 
zoids of Riccardia pinguis seem 
to be unique among the arche- 
Fic. 1. An antherozoid of Ric- : 
cardia pinguis in the uncoiled condi- —— . 
ba, % yeas. The anterior end of the body 
of the antherozoid, extending 
forward from the point where the longer cilium is attached, 
stains less intensely with the gentain violet. It appears, 
therefore, that this portion is at least partially cytoplasmic. A 
darker staining portion at the point of attachment of each cilium 
can always be observed when the antherozoid is not over- 
