FERTILIZATION IN THE HONEY-BEE 241 
figs. 1 and 3, 7). One arm of the U, representing the gland (d), 
increases in size, while the other, that representing the vas 
deferens (h) remains relatively small. The result is, first, that 
the vas deferens becomes a fine duct leading into the massive 
gland and, second, that as the gland protrudes toward the ejac- 
Text fig. 3 Diagram to explain the derivation of the third or internal muscle 
layer of the mucous gland. Lettering as for text figure 1, with addition of the 
following: A-B-C-E, original direction of the lumen of the gland-vesicle funda- 
ment in development; A~B-—C-D, direction of lumen in mature gland, whose base 
has enveloped the blind end of the ejaculatory duct 7; XYZ, path of the circular 
muscle fibers around the end of the vas deferens in the wall of the gland; X’’"Y’"’Z"’, 
fibers around the body of the gland; X’Y’Z’, fibers distorted out of the cireum- 
ferential position by the protrusion of the gland’s base to meet the end of the 
ejaculatory duct at 7, and by the second protrusion into the elbow of the gland, 
m; X-X'’, Y-Y"’, Z-Z"’, three inner longitudinal muscle tracts derived from fibers 
of the circular layer by change in shape of the gland’s base ati and m. See text 
for further explanations, also text figure 1. 
ulatory duct to form a definite basal pocket (7), the entrance of 
the vas deferens into the gland is left distal to and at one side 
of this secondarily formed basal region; that is, it comes to enter 
not at the end of the gland, but at some distance up its side. 
From a U shape, the lumen of the two organs, mucous gland and 
THE JOURNAL OF EXPERIMENTAL ZOOLOGY, VOL. 31, NO. 2 
