DEVELOPMENT OF THE OPOSSUM 541 | 
Eggs were found in both tubes of female No. 56; and, since 
both batches of eggs had practically no albumen deposited on 
their surface, they must have been discharged simultaneously 
from both ovaries a short time before their removal. None of 
these eggs possesses any granulosa cells nor was any semblance 
of a ‘corona radiata’ ever observed on any tubal ova. Their 
naked condition when discharged is positive evidence that 
Selenka (87) was in error when he considered the shell mem- 
brane of uterine eggs as the modified granulosa cells—an 
error made despite Caldwell’s correct interpretation of this 
structure. 
Litter No. 76 was taken from one Fallopian tube only, the oppo- 
site one not yet having received the ova, which had, however, 
been discharged from the ovary on that side, as indicated by 
the presence upon it of fresh corpora lutea. I infer that the 
eggs must have been lost in the body cavity. Since the eggs 
secured from the right uterus had already been provided with a 
small quantity of albumen, one may assume that they had an- ° 
ticipated the eggs from the other ovary by a short space of 
time. 
No. 351 had ovulated at 5 p.m., when the animal was first 
opened, but no eggs were found in the left Fallopian tube, they 
having also been lost in the handling of the organs. Two and 
a half hours later the right tube contained eggs which had a 
distinct albumen layer on all sides (fig. 2, pl. 3). If this repre- 
sent the amount of albumen deposited in two and a half hours, 
it would require twenty-four hours for the eggs to traverse the 
Fallopian tube and receive their entire quantum of albumen. 
Professor Hill thinks that the eggs of Dasyurus pass through the 
tube very quickly, since he has never found a whole litter of 
eggs in the tube. But the uterine eggs of Dasyurus are very 
scantily provided with albumen; in fact, never relatively more 
than the incomplete deposit around the eggs of my litter No. 351 
(hoa pl: 3). 
Eggs No. 307 (fig. 7, pl. 1) show a greater deposit of albumen 
on one side of the egg. Since this is true to some extent in all 
the eggs found in the upper part of the tube, and since, later, 
JOURNAL OF MORPHOLOGY, VOL. 32, NO. 1 
