pom. feet 

 com 



com. cb. // /luc.me^.F' —5^ 



com.ch.l. 



n. im 



fr sp. t. 

 tr/r. b. 



Fig. 21 Through the dorsal part of the recessus lateralis, illustrating the plexi- 

 form lateral wall. 



Fig. 22 Section 0.4 mm. farther ventrad. 



Fig. 23 Section 0.18 mm. farther ventrad, through the ventral part of the re- 

 cessus lateralis. 



Fig. 24 Section 0.165 mm. farther ventrad, through the floor of the recessus 

 lateralis. 



27 



