176 ANCEIDZE. 
speed. Now we contend, and our own observations con- 
vince us, that fig. 10 is the larval stage of the male, and 
that fig. 11 is a similarly advanced condition, or the larval 
stage of the female. At the period when the larve 
quit the ovigerous pouch of the parent, the simi- 
larity of the two sexes, it is true, is very close, and 
not readily distinguishable ; but even at this early period 
the transparent membranes enveloping the terminal seg- 
ments of the pereion, seen in the woodcut in page 177, 
indicates a form more nearly approaching to that of the 
adult female (or Praniza form of Anceus), than to that of 
the male or true Anceus. 
We have examined great numbers of the larvze just as 
they are ready to quit the ovi-pouch, and think that we 
could determine a sexual distinction, but we hesitate 
to pronounce this with certainty, because it appeared 
to us that both sexes were never developed in the same 

DEVELOPMENT OF ANCEUS. 
