. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. MULTIPAROUS FEMALES 455 The appearance of the corpora lutea in the case where there were four simultaneous ovulations is illustrated in Text-fig. 10 a. The female which had 13 corpora lutea in the ovaries was examined by Dr R. H. Clarke on 25 February 1948 in 6i° 14' S., 870 25' E., and measured 78-5 ft. in length. This female carried 5 male foetuses of lengths 2-03, 2-26, 2-28, 2-54, and 2-67 m., the first of which was necrotic, the others healthy. There were 16 corpora albicantia in the ovarie
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. MULTIPAROUS FEMALES 455 The appearance of the corpora lutea in the case where there were four simultaneous ovulations is illustrated in Text-fig. 10 a. The female which had 13 corpora lutea in the ovaries was examined by Dr R. H. Clarke on 25 February 1948 in 6i° 14' S., 870 25' E., and measured 78-5 ft. in length. This female carried 5 male foetuses of lengths 2-03, 2-26, 2-28, 2-54, and 2-67 m., the first of which was necrotic, the others healthy. There were 16 corpora albicantia in the ovaries and details of the 13 corpora lutea are given in Table 27. It will be seen that none of the corpora lutea is of very small size, ranging from 7 to 14-5 cm. in diameter, and all would therefore be expected to leave a permanent record in the ovaries (p. 375). Making due allowance for these supernumerary corpora lutea it is estimated that on average 1 -034 corpora lutea are formed each ovulatory cycle, that is to say the proportion of extra ovulations is 3-4 ±1-02%. With a smaller sample (part of the present sample) in which the corpora lutea were examined in detail the proportion of accessory corpora lutea was 3*7% (p. 361). Proportion of females in oestrus or pregnancy Another aspect of the variation in sexual activity with age can be studied by examining, for successive groups of corpora numbers, the percentage of adult females which show one or more active corpora lutea in the ovaries. The majority of these females will be pregnant, but a small proportion are in a 100 b z u 250 s NUMBER IN SAMPLE 776 416 268 192 116 67 42 20 3 2 5 100 NUMBER IN SAMPLE 490 281 178 128 76 49 29 IS 3 2 I. A 1 h O 5 10 15 20 25 30 35 40 45 50 55 NUMBER OF CORPORA O 5 10 15 20 2 5 30 35 40 45 50 55 NUMBER OF CORPORA b Text-fig. 52. a, Percentage of mature females which have an active corpus luteum in the ovaries. b, Percentage of these corpora lutea which represent pregnancies. post-oestrus con
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