1881.| The Bee's Tongue, and Glands connected with tt. 117 
while those from the head are larger, different in shape, and 
composed of much smaller cells. Keeping to the floor of the 
head, the main duct passes on to the sub-mentum. Here on 
joining the spiral tube coming from the ligula, it passes by an 
opening common to both into the mouth at 4, Fig. 1. Below 
the opening the spiral tube dips into the mentum, and is imbed- 
ded in its muscles. 
Fic. 3.—One of the glands of the thorax, magnified thirty diameters. 
At a (Fig. 1) it seems to terminate, judging from a side view, 
but a series of cross sections shows it to gradually widen from @ 
(Fig. 1) to near the’ base of the ligula, where it terminates in a 
chamber that leads above into the sack, and below by a valvular — 
opening into the groove in the rod. This trumpet-shaped part 
from (a) to the chamber at the base of the ligula, is collapsed, the 
upper half of the tube being pressed down into the lower half. 
