Fig. 3.  Longitudinal sections of the walls of the sacs of the pond larva, 
a young larva (5 mm.), E—G of a full grown larva. Å is a section of the rlrlbel 
wall, the dimensions are the follow ” a 
length of the «heads» 1,8 4, breath of the dark stripes 1,4 4, of the grey stripes 
0,5 i p É: 
layer 1,8 4, chitine 4,2 4. «heads» 0,8 4, dark stri 5, grey strip Cc 
of the ventral side an he one end. D part of the lateral surface, the ends of 
str others, stri- 
r 
side: dimensions: Total 21,8 44, chitine 
side; dimen 
w. All figure ucida, 
Winkel complan. oc.5 5 (entarged ca. diam.). the mu anes with L. 8, W, compl. 
5 (ca 
. 1200 dia 
