. 80 65 30 LENGTH OFWHALE IN FEET 95 Fig. 6. Lengths of physically immature and mature whales (1932-3). (Pecked line, immature; solid line, mature.) summary, i. Blue females taken in pelagic whaling appear to attain sexual maturity on the average at the same length (78 ft.) as South Georgian whales. 2. The presence of a corpus luteum of pregnancy in the ovaries is taken to be the best index of pregnancy of the animal though some allowance must be made for whales ovulating in the summer and exhibiting a corpus luteum of ovulation, or pseudo- pregnancy. 3. A slight predominance of males is found
. 80 65 30 LENGTH OFWHALE IN FEET 95 Fig. 6. Lengths of physically immature and mature whales (1932-3). (Pecked line, immature; solid line, mature.) summary, i. Blue females taken in pelagic whaling appear to attain sexual maturity on the average at the same length (78 ft.) as South Georgian whales. 2. The presence of a corpus luteum of pregnancy in the ovaries is taken to be the best index of pregnancy of the animal though some allowance must be made for whales ovulating in the summer and exhibiting a corpus luteum of ovulation, or pseudo- pregnancy. 3. A slight predominance of males is found in foetuses, in agreement with the foetal figures in International Whaling Statistics. Males are about 54 per cent of the total and females about 46 per cent. 4. The foetal growth curve as indicated by the mean monthly lengths of foetuses agrees closely with the mean growth curve for Blue whales taken in South Georgia. This is a strong indication that the Blue whales in both regions are essentially similar in their breeding habits and observe the same mean pairing season. 5. Frequencies of corpora lutea numbers in Blue whales do not show the maxima and minima on which a deduction of age was made for Fin whales.
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