PLATE III
EXPLANATION OF FIGURES
34. A view of the fundus end of a vesicle which contained embryos measuring
31 mm. head rump length.4 In the portion of the vesicle lying within the margin
of the placenta are seen four w'indow-like spots. These are the areas where the am¬
nia come in contact with the wall of the vesicle. The fundus end is now practically
free of villi. X 5
35. A view of the cervix end of a vesicle in which the embryos measured 31
mm. The clear yolk-sac is seen through the opening in the rather thick placental
overgrowth. The margin of this opening represents the place where the placenta
is attached to the uterine mucosa at the cervix end of the uterus. X §
30. The dorsal view of a vesicle which is still attached to the cervix of the con¬
tracted uterus. This vesicle shows a distinct placental bridge (p.b.) connecting
the lateral placentae, and also a number of blood vessels at the fundusend. Em¬
bryos 32 mm. in length. X 3
37. A view of the fundus end of a vesicle which contained embryos measuring
33 mm. This view shows two points worthy of especial note: (1) the four-lobed
appearance of the fundus membrane, due to constrictions occurring between the
fundus areas of the individual embryos (seen more clearly before fixation); (2)
the persistence of a few villi, which in the photograph appear as scattering black
specks. X §
38. A view of the ventral side of vesicle, with embryos measuring 3G mm. The
cervix end of the yolk-sac is clearly visible, and blood vessels are seen at the fundus
end. The placental bridge although present is not clearly brought out in the
photograph. X I
39. A view of the ventral side of a vesicle which contains embryos measuring
53 mm. The division of the zone-like placenta into right and left halves is clearly
brought out. The fundus end of the vesicle is now practically free of both villi
an 1 blood vessels, and the membranous area at the cervix is much larger than in
the preceding figure. X §
’Unless otherwise stated, the length of the embryo will mean the head-rump
measurement.
PLATE III.
DEVELOPMENT OF THE NINE-BANDED ARMADILLO.
H. H. NEWMAN ANDJ. T. PATTERSON.
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37
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JOURNAL OF MORPHOLOGY, VOL. 21, NO. 3.