634 
GILBEET E. JOHNSON. 
clear that the females are often — if not always — hermaphrodite. 
On the other hand, in spite of the fact that males have never 
been observed to exhibit any sexual instincts whatever, it seems 
probable, from the cases, especially in the parental generation, 
in which the females have propagated only when males have 
been present, that reproduction is sometimes bisexual. This 
Table 4.— Culture F. 
\ 
o o 
Fi 
F2 
F3 
F4 
O 
O 
O 
O 
O 
O 
o 
o 
9 ^ 
P 9 9 ? 9 9 
CH- 
? 5 
P 5 
P ^ 
^ o o o o o 
^^^^OO OOOO 
Fs 
would mean that a number of true females exist side by side 
with the hermaphrodites as in Rh. marionis, a species 
described by Maupas (14, p. 506). 
Rh. marionis affords also a remarkable instance of in- 
cipient hermaphroditism. Among the hermaphrodites not 
only are true females occasionally found, but also individuals 
which are partly hermaphrodite and partly female, the one 
half of the paired genital gland producing both eggs and 
