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PACIFIC SCIENCE, Vol XI, October, 1937 
Fig. 2. Longitudinal section of the proximal vas deferens of An i cuius maximus (slightly distal to Fig. 1) 
showing: a, muscle layer; b, elongate epithelial cells; c, sectioned portion of arch; d, precursory stalk ma- 
terial; e, foot; /, short epithelial cells of narrow portion of lumen secreting the foot material. (The numbers 3, 
4, 5 show regions through which Figs. 3, 4, 5 are taken.) 
crons wide and appears like a distinct am- 
pulla resting on the broad foot (e). 
In subsequent sections through this region 
of the vas deferens (Fig. 4) although the foot 
forming epithelial cells (/) do not shorten, 
the epithelial cells ( b ) "above” the sectioned 
portion of the arch (c) attain a length of ap- 
proximately 182 microns. Again it is note- 
worthy that the sectioned portion of the arch 
(c) appears like a distinct ampulla 171 microns 
high and 118 microns wide. Whereas, in 
Figure 3 the "ampulla” appeared to rest 
firmly on the broad, basal foot, in Figure 4 
it is "elevated” approximately 12 microns by 
the sectioned portion of the stalk precursor 
{d). 
In still other cross sections through this 
region of the vas deferens (Fig. 5) neither the 
foot forming epithelial cells ( f) nor the 
epithelial cells (b) above the sectioned portion 
of the arch (c) change appreciably in length. 
And again it is noteworthy that the sectioned 
portion of the arch (c) appears like a distinct 
ampulla, 171 microns high and 118 microns 
wide. The "ampulla” is elevated approxi- 
mately 35 microns above the foot (e) by the 
sectioned portion of the stalk precursor (d). 
The broad groove so characteristic of this 
portion of the lumen is no longer encountered 
in cross sections through the enlarged, apical 
portion of the vas deferens (Fig. 6) . Gradually, 
the epithelium becomes folded and two ty- 
phlosole-like regions (b) appear at opposite 
sides of the lumen. From the epithelial cells 
bordering the crypts of these typhlosole-like 
folds, a new mucus-like secretion forms the 
matrix (c) which encompasses the completed 
spermatophores. 
Because of its tortuous nature, both cross 
sections (e) and longitudinal sections (d) of 
