346 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
I shall describe briefly the principal blood vessels that I have found 
in Desmognathus fuscci, and their distribution, as well as the capillary 
conditions in this lungless form. Both the larger and smaller vessels 
differ in certain points from those of Spelerpes. The operation of 
injecting so small an animal was exceedingly difficult and only after 
repeated failures was success attained. A warm carmine-gelatin 
mass was used, with a freshly killed specimen, the body of which was 
constantly bathed in warm water. For forcing the fluid into the heart, 
a small hypodermic syringe was employed, with the point of the needle 
filed down blunt, and a groove filed near the end to keep the ligature 
from slipping. This blunt end of the needle was introduced through 
the snipped-off tip of the ventricle and tied in place. The accompany¬ 
ing figures (pis. 23-25, figs. 1-6) show the parts enlarged to five times 
their natural size, except fig. 4 (pi. 24) which is about ten times nat¬ 
ural size. It was impossible to include all the blood vessels in one 
drawing with any clearness, and therefore the six drawings are in¬ 
tended to supplement one another. The colors are to indicate ana¬ 
tomical distinctions, blue for veins and capillaries, red for arteries. 
Beginning with the venous system, which is the one most super¬ 
ficial on opening the animal from the ventral side (pi. 23, figs. 1, 2), 
we find the blood from the anterior region of the body brought to the 
sinus venosus through the ductus Cuvieri by a large vein, the vena 
jugularis interna. In pi. 25 (fig. 5) is shown the origin of this vein, 
formed by the union of the venae maxillares, superioris and inferioris. 
The vena maxillaris inferioris is shown in pi. 23 (fig. 1). It starts at 
the tip of the jaw from an anastomosis with the vein of the opposite 
side, and follows the course of the lower jaw. The vein of the left 
side in many specimens studied, but not in all, received a large branch 
near the anterior end of. the jaw, that arose in a peculiar bunch of little 
white tubules near the base of the tongue. The vena maxillaris supe¬ 
rioris is made up of branches from each side of the eyeball (pi. 25, 
fig. 5). 
Opening into the ductus Cuvieri at the same point as the vena jugu¬ 
laris interna is the large vena cutanea magna (pi. 23, fig. 1). This 
receives on its course branches from the sides of the animal (pi. 25, 
fig. 5), and one relatively large branch from the skin of the dorso-lat- 
eral part of the head, that seems to correspond to Bethge’s vena cu¬ 
tanea parva (pi. 25, fig. 6). 
The vena jugularis externa is a small branch made up of the vena 
