SEELYE: CIRCULATORY SYSTEM OF DESMOGNATHUS. 351 
3. A side tributary of the vena lingualis, observed, however, only 
on the left side. 
4. The arteria cutanea, a branch of the arteria pulmonalis, instead 
of a branch of the arteria subclavia. 
5. Four arteriae gastrieae at anterior end of stomach, instead of 
two; three of these go to one side (the left). 
6. The presence of the arteria epigastrica, an important branch 
from the aorta just anterior to the arteria iliaca. 
We have next to consider the capillary distribution in mouth, 
pharynx, and esophagus. The integumental capillaries have already 
been described in the section on the skin. While my investigations 
were in progress an article appeared, by F. Maurer ( 97 ), entitled 
“Blutgefasse im epithel. ” Maurer showed the presence of capil¬ 
laries in the epithelium itself of the mouth cavity of a frog. Following 
the technique which he outlined, I made sections through the buccal 
epithelium of Desmognathus, and succeeded in showing capillaries 
even nearer to the surface than Maurer had done. These sections 
are shown in plate 26 (figs. 9, 10); sup. indicates the superficial 
surface, and the nearness of the capillaries (cap.) to it is remarkable. 
The pharyngeal capillaries measured from 4 to 28 micra in diameter, 
but the results of these capillary measurements and those of Bethge 
seem to me untrustworthy because they were taken on injected blood 
vessels, and the diameter of a capillary might vary with the amount of 
injecting fluid forced into it. A study of a bit of injected pharyngeal 
epithelium, dehydrated and cleared, revealed curling and twisting 
capillaries in a close network, as shown in plate 26 (fig. 13), but no 
diverticula nor marked swellings such as Bethge described and pic¬ 
tured for Spelerpes. An appearance of a diverticulum or swelling, 
shown in the drawing of the outline of the capillaries, always proved, 
by focusing up and down on the object, to be a bend in the capillary as 
it passed in a plane at right angles to the slide (pi. 26, fig. 13, places 
marked b). 
A careful study of the esophageal region in a well injected specimen 
brought to light a marvelously fine and extensive network of capillaries 
on the esophagus. Branches of the arteria maxillaris externa on the 
dorsal side, and of the arteria pharyngea on the ventral wall, become 
finely subdivided as shown in plate 24 (fig. 4). From these capillaries 
the blood is taken up by the veins, especially the esophageal vein with 
its tributaries. Further details of these esophageal capillaries are 
