354 THE AMERICAN NATURALIST. | (Vor. XXXIX. 
just posterior to the iliac process. The smaller vein left the fin 
on the anterior side of the first or pre-axial fin-ray. 
II. Raia erinacea: young male. 
1. Renal portal system injected, via the caudal vein, with blue 
celloidin. 
A small amount of the celloidin appeared in the cardinal 
sinus. 
2. Left lateral vein injected posteriorly with red celloidin. 
The mass did not appear on the rectum. 
During the progress of the injection the posterior margin of 
the left pelvic fin was cut away. The red celloidin escaped 
from a small vessel lying along the median edge of the clasper. 
In the dissection of this fish the lateral vein was traced to the 
wall of the cloaca, where it was lost in fine branches. A large 
vein from the pelvic fin was found opening into the lateral vein 
ata point dorsal to the girdle and just posterior to its iliac 
process. 
III. Raia erinacea : female. 
1. Renal portal system injected, via the caudal vein, with 
blue (raw) starch. ; 
The starch mass did not pass into the cardinal sinus. 
2. Left lateral vein injected posteriorly with red celloidin. 
A fine anastomosing network on the cloaca and rectum was 
injected, as in I. 
The left pelvic fin was cut, asin II. There was slight evi- 
dence of the red celloidin at the cut surface. 
By dissection, the lateral vein was traced back along the pelvic 
region of the abdominal wall and onto the lateral wall of the 
cloaca along which it ran, giving off numerous branches and 
rapidly diminishing in caliber, to a point about 15 millimeters 
posterior to the rectal gland, where it became completely lost in 
a fine network. 
The lateral vein was found to receive from the pelvic fin a 
fairly large trunk which emerged from the fin on the anterior 
side of the first or pre-axial fin-ray. 
