A Manual of Zoology for the Use of Students With a General Introd On the Prin
A Manual of Zoology for the Use of Students With a General Introd On the Prin
Nicholson Henry Alleyne
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116, C) is an embryonic structure, which is developed out of the middle or " vascular " layer of the germinal membrane. It ap- pears at first as a solid, pear-shaped, cellular mass, arising from the under part of the body of the embryo. In the process of development, the allan- tois increases largely in size, and becomes converted into a vesicle which envelops the embryo in part or wholly. It is abundantly supplied with blood, and is the organ whereby the blood of the foetus is aerated. The par...t of the allantois which is external to the body of the embryo is cast off at birth; but the portion which is within the body is retained and is con- verted into the urinary bladder. DIVISIONS OF THE VERTEBRATA. 339 a single piece, and the lower jaw is united with the temporal (squamosal) element of the skull, and is not articulated to a quadrate bone. There are special glands the mammary glands for the nourishment of the young for a longer or shorter period after birth, and the red blood-corpuscles are non- nucleated.
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