THE SOUTHERN SEA LION 



i39 



No. 446, however, had very small ovaries, short and slender cornua and a small and 

 apparently unstretched common passage as well as comparatively small body size. 

 There was, moreover, no trace of milk and, at a time (June) when pregnant cows have 

 foetuses several centimetres in length which cannot escape observation, there was no 

 suspicion of the presence of a foetus. It is, therefore, my opinion that no. 446 was non- 

 parous, and almost certainly a virgin in an advanced stage of pseudo-pregnancy. 



Note on measurements of ovaries and uteri. Fixation usually causes the muscles of the 

 living uterus to contract. It has therefore not been considered advisable to measure the 

 thickness of the uterine stroma. But since it was considered desirable to make some 

 comparison of the sizes of the uteri the entire segments were measured for outside 

 diameter with callipers which read to 0-5 mm. and the result is shown in Fig. 4 against 



200i 



190 



180 



u 



c 



£ 170 

 tm 



c 

 <u 



_l 



zr 

 1! 160 



CD 



150- 



140 



• • • « • 



• • • • 



t 

 % • • 



1 • • 



• ••• • 



I 2 



External Diameter of Cornua in cm 



Fig. 4. Body length and average thickness of cornua. 57 non-pregnant females. 



the total length of the animals. It was observed during collection that there was a great 

 difference in size of the ovaries. They have therefore been weighed and their weight as 

 well as the outside diameter of the cornua has been found to vary approximately with 

 the size of the animals from which they were procured, that is, with age (Fig. 5). In 

 making these comparisons, cornua of pregnant cows were omitted, and cornua showing 

 obvious post-partum enlargement were also shut out. Test plotting, in which oestrous 

 and post-ovulation specimens were differentiated, showed no significant correlations. 

 Table VII shows the figures resulting from the measurements. 



OESTRUS, IN THE MALE 

 In order to ascertain if there is an anoestrous season in the male 1 1 bulls were killed 

 to provide material for microscopic examination. These animals varied from 213-4 to 

 246-4 cm. in length and were with one exception the largest males I could find at the 



