. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 406 DISCOVERY REPORTS chorionic vesicle extends itself into the corpus and into the other cornu. There appears, however, to be no intimate union between the placenta and the uterine wall at any stage in the development. The non-pregnant part of the uterus also undergoes considerable enlargement with the size of the foetus, but the growth is far less marked than that of the pregnant cornu. When the pregnant cornu contains a foetus 4-0-5-0 m. in length and measures 90-0-95-0 cm. in diameter, the n
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 406 DISCOVERY REPORTS chorionic vesicle extends itself into the corpus and into the other cornu. There appears, however, to be no intimate union between the placenta and the uterine wall at any stage in the development. The non-pregnant part of the uterus also undergoes considerable enlargement with the size of the foetus, but the growth is far less marked than that of the pregnant cornu. When the pregnant cornu contains a foetus 4-0-5-0 m. in length and measures 90-0-95-0 cm. in diameter, the non-pregnant cornu may have enlarged to the order of 70-0 cm. The uterus recovers quickly after parturition and in lactating whales assumes its normal resting dimensions—namely about 17-0 cm. At their junction with the short corpus the cornua remain still separated by a median tongue (Fig. 12/2). In the 2-1 m. foetus this measured 3-0 cm. in length. This tongue projects backwards into the lumen of the corpus so that the cornua finally join together very obliquely. The corpus uteri (Fig. 12/3) is very short. In the 2-1 m. foetus the distance from the tip of the median tongue to the narrow entrance to the vagina was 3-0 cm. The lining mucous membrane of the cornua and of the corpus is raised into very numerous short parallel ridges, longitudinal in direction, with depressions between them. These ridges are firm and erect in the foetus, but in older whales, after weaning, they take on the character of loose folds. The corpus has one or two very slight circular constrictions (Fig. 12), foreshadowing, as it were, the vaginal pleats shortly to be described. The longitudinal ridges of mucous membrane are continued over these constrictions which do not make the complete circuit of the lumen of the corpus. Transverse sections of the cornua (Fig. 16) reveal the ciliated epithelium intact only between the parallel ridges. In the foetus 2-1 m. in length the glands were not yet properly de
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