366 H. H. Newman and J. T. Patterson. 



of entrance of the fallopian tubes are about equadistant from 

 the tip of the fundus and the vagina, thus rendering the cavity of 

 the uterine body much larger as compared with that of the cervix 

 than is the case in the human uterus, where the tubes enter prac- 

 tically at the distal end of the organ. 



The ovaries are kidney-shaped having the convex side directed 

 anteriorly, with reference to the axis of the animal. In virgin 

 females the two ovaries are approximately equal in size, but in 

 individuals that are or have been recently pregnant there is always 

 a considerable difference in the size of the two ovaries. The larger 

 one may be two or three times as large as the smaller, and this 

 greater size is invariably due to the presence of a single enormous 

 corpus luteum, the actual bulk of which may be much greater than 

 that of the remaining ovarian tissue. There are found notinfre- 

 quently smaller bodies (resembling in histological appearance the 

 large corpus luteum) which are crowded to one end of the ovary and 

 suggest by their shrunken and irregular form that they are either 

 relics of a previous pregnancy or simply the lutea of ova which 

 were never fertilized. It may be stated without hesitation how- 

 ever that there is never more than one large and prominent corpus 

 luteum in the ovaries of a pregnant female. 



The mucosa of the uterus is undoubtedly deciduate in charac- 

 ter, as may be seen in the illustration of a section taken from a series 

 cut through a pregnant uterus and its contents (fig. 1). Even 

 at the comparatively early period represented it can readily be 

 seen that the mucosa is separated from the outer layers of the uterus 

 by a lymph space of considerable magnitude. 



Since the young embryonic vesicle always gains attachment to the 

 mucosa near the tip of the fundus it is not a difficult matter to 

 orient it with reference to the uterine axis. It will be found con- 

 venient to refer to the fundus and cervix ends of the vesicle, the 

 former being the original attached and the latter the original free 

 end. The axis of each embryo is also related to that of the 

 uterus, in that its anterior extremity is directed towards the 

 cervix end of the vesicle, except in advanced conditions when the 

 length of the umbilical cord occasionally permits an embryo to 

 reverse its position within its amniotic sac. 



