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MR. J. GOODSIR ON THE SUPRA-RENAL, 
renal capsules being' developed in connection with the omphalo-mesenteric vessels, 
the thymus to the jugular and cardinal veins, and ductus Cuvieri ; and the thyroid to 
the anastomosing branches of the first and second aortic arches, as organs perform- 
ing functions, whatever these may be, analogous to those of the blastoderma, differ- 
ing from them only in this, that the blastoderma not only elaborates nourishment 
for the embryo, but absorbs it also from without, that is, from the yelk ; whereas the 
three organs in question only elaborate the matter which has already been absorbed 
by the other parts, and is now circulating in the vessels of the more perfect indivi- 
dual. 
Description of the Plate. 
PLATE XXXVI. 
Fig. 1. A portion of an early embryo of the Sheep. 
a . Heart. 
b. Lungs still in front of the intestinal tube. 
c. Wolffian body. 
d. Lateral mass of blastema, out of which is formed the supra-renal cap- 
sule, thymus and thyroid. 
e. Cardinal vein. 
f. Jugular vein. 
g. Ductus Cuvieri. 
Fig. 2. A portion of the early embryo of the Sheep. 
a. Intestinal tube and ductus vitelli. 
b. Liver. 
c. Omphalo-mesenteric vein. 
d. Omphalo-mesenteric artery. 
e. f. Mass of blastema on the inner side of the Wolffian body, and around 
the trunks of the omphalo-mesenteric vessels ; this is the posterior 
part of the lateral mass of blastema marked d in fig. 1, and becomes 
in the course of development the supra-renal capsule. 
Fig. 3. An early embryo of the Sheep. 
a. Head, branchial arches, and rudiment of the eye. 
b. Heart. 
c. Ductus Cuvieri entering the auricle, and receiving 
d. The jugular, and 
e. The cardinal vein. 
f. The lateral blastema. 
g. Wolffian body. 
h. Umbilical cord, to which is passing 
