176 



ANCEIDiE. 



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^l^of the female. At the period when the larvae 

 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 larvae 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 



