

EXPLANATION OF PLATE 8. 



Fig. 3. Distal moiety of a large trophonema from one of the spiracles, to show the 

 superficial texture and the outstanding vein. 14. 



Fig. 4. Apex of the same trophonema, to show the compound duct-openings, 

 x 66. 



Fig. 5. Transverse section of a trophonema in its distal half, to show the glands 

 in vertical section, x 120. a, artery ; V, main trunk ; and V, V, branches 

 of vein with coagula in their lumina. 



