HiMoyo jo inhowv 
GROWTH-CHANGES IN MAMMAEY APPARATUS OF DASYURUS. 219 
the size of the gland daring lactation, and finally the two 
structures die away together. 
In a previous section it has been pointed out that 
when ovulation is not followed by fertilisation the 
mammary glands undergo an enlargement similar to that 
Text-fig. 2. 
4 
5 6 7 0 8 F 9 10 II IZ 13 14 15 16 17 
AFTER BIRTH 
EMBRYONAL DEVELOPMENT 
The Growth Curves of the Mammary Glands and 
Corpus luteum in Dasyurus viverrinus. The con- 
tinuous line represents the growth of the mammary glands. The 
dotted line represents the growth of the corpus luteum. The 
numbers along the base line represent stages in the develop- 
ment of the embryo, the details of which have been given in the 
table above or in the list of material. The letters d and F are 
intermediate stages in the development of the embryo taken 
from Sandes’ list, and the details of them are given in the above 
table. (i) End of the formation of the corpus luteum. 
(ii) Beginning of marked growth in mammary glands, (iii) 
Height of growth activity in the corpus luteum. (iv) Height of 
growth activity in the mammary gland, (v) End of growth 
of the corpus luteum. (vi) End of growth of the mammary 
gland. 
VOL. 57, PART 2. NEW SERIES. 
17 
