Xs) 80 0 P20 2003 
QSeg? “LF OS 
ce aK oL 
0) ‘ 
Figs. 1 to 8 are successive sections. Between Figs. 8 and 9 
(10) one section is omitted, which shows nothing of importance. 
In Section 10 (Fig. 9 [10]) half of the terminal duct is cut 
through, and this should be sufficient for the proof of my asser- 
tions. Nevertheless, I have added one figure (Fig. 10 [17]) 
a 
