324 The American Naturalist. [April, 
P. Blood capillary. 
c. Carbon-laden leucocytes. 
Note the presence of ingested leucocytes in extravascular 
tissue as well as on the ental surface of the lung. 
B. Section of kidney of Cryptobranchus. 
I. Transection of the ureters and cloaca, showing masses 
of ingested cells. i 
a. Ureters. ; 
c. Carbon-laden leucocytes. 
l. Non-ingested leucocytes. 
II. Transection of urinary tubules. 4 
~ ¢. Carbon-laden leucocytes. 
III. Nephrostomic funnel, showing ciliated mouth. 
c. Ingested leucocytes. 
l. Non-ingested leucocytes. 
IV. Vertical section of the kidney near the ventral surface. 
. Glomerulus. 
Capillaries of blood-vessels. 
Urinary tubules. 
s. Lymph space around the glomerulus. 
o. Origin of a urinary tubules, with small ciliated 
epithelium. 
b. Red corpuscles. 
c. Carbon-laden leucocytes. 
Note the presence of extravascular ingested cells. 
Bye 
Prare VII. 
A. Vertical section of stomach of Cryptobranchus, near the 
pyloric part. 
I. Submucosa. 
II. Muscularis mucose. 
IIT. Mucosa. 
c. Carbon-laden leucocytes. eo 
Note the presence of the extravascular ingested cells. 
The figure is diagrammatic in so far that the locations of the 
ingested cells are taken from different sections and put vei 
one figure. a 
