62 DISCOVERY REPORTS 



was involuted, in which case this whale had been pregnant previously, but, in view of its size, pro- 

 bably not more than once. 



No. 3108. Length 12-35 ""i- -• ''• 3°- South Georgia. Pregnant. One ovary weighed i lb. 10 oz. 

 and contained a corpus luteum a of 10 cm. mean diameter and 14 oz. weight. The other ovary weighed 

 12 oz. No corpora lutea b were present in either ovary, but there were some follicles up to 10 mm. 

 in diameter visible below the surface in both. A foetus 0-76 m. long was present : the pregnant cornu 

 of the uterus was 41 cm. across and the non-pregnant one 23-5 cm. The mammary gland was 3 cm. 

 thick and had never lactated. This whale was therefore pregnant at the first ovulation of the first 

 sexual season. 



No. 516. Length 14-53 n^- ^- •'- 26- South Georgia. Pregnant. One ovary contained a corpus 

 luteum a, 1 1 cm. in mean diameter, and two corpora lutea 6 of 6 and 3 cm. mean diameter. The other 

 ovary was not examined. A foetus 0-75 m. long was present. The vulva was swollen and congested and 

 contained mucus. The mammary grooves were closed and there was no milk ; the mammary gland was 

 5-6 cm. thick and contained a brown sticky fluid which may have been pathological in origin, or may 

 have indicated the last stages of involution from the previous pregnancy, for the whale had probably 

 been pregnant before as shown by the two corpora lutea b in one ovary, together with the total length 

 of the whale. 



No. 3206. Length 13-9 m. ii.iii. 30. South Georgia. Ovulating. One ovary weighed 5 lb. 14 oz. 

 and contained a corpus luteum a 12 cm. in mean diameter and i lb. in weight. It also contained three 

 corpora lutea b (not measured). The other ovary weighed 4 lb. 13 oz. and contained seven corpora 

 lutea b of mean diameter 5-3, 3 cm. and less. No foetus was present and the mammary gland was 

 7 cm. thick and involuted. This whale was therefore a multipara and had just ovulated. 



No. 96. Length 13-55 ^^- i^>- ™- ~S- South Georgia. Lactating. This whale was lactating, the 

 mammary gland being "greatly swollen " and milk spouting from it on the flensing plan. The uterus 

 was 20 cm. across. Further details are lacking. 



No. D. 49. Length 14-0 m. 27. vi. 30. Durban, South Africa. Resting. One ovary weighed 



I lb. 2 oz. and contained four corpora lutea b of mean diameter 4, 3 cm. and less. No follicles were 

 visible. The other also weighed i lb. 2 oz. and contained five corpora lutea b, the largest, which was 

 the youngest in either ovary, of mean diameter 5 cm. The others were old and resorbed. No follicles 

 were visible on the surface. The uterine cornua measured 11 -5 cm. across on the right side and 



II cm. on the left. This whale was therefore a multipara in anoestrus, probably between pregnancy 

 and the next dioestrous cycles. 



No. 3426. Length 14-2 m. 6. xii. 30. South Georgia. Pregnant. One ovary weighed 5 lb. 14^ oz. 

 and contained one corpus luteum a of mean diameter 16 cm. and four pounds weight. It also con- 

 tained thirteen corpora lutea b of mean diameter 5-3, 3-5, 2-6 cm. and less. A few follicles up to 

 35 mm. in diameter projected on the surface. The other ovary weighed i lb. 6 oz. and contained 

 one corpus luteum h of 4 cm. mean diameter, and six old corpora lutea b, not measured. There 

 were a few projecting follicles up to 35 mm. in diameter. The largest corpus luteum b in this ovary 

 was of about the same age as the corpus luteum b measuring 3-5 cm. in mean diameter in the other 

 ovary. A foetus 0-04 m. in length was present, the pregnant cornu of the uterus measuring 50 cm. 

 across and the non-pregnant one 44 cm. The mammary gland was 10 cm. thick and involuted. This 

 whale was a multipara and had probably been pregnant on several occasions, as indicated by the 

 thickness of the involuted mammary gland and the size of the non-pregnant uterine cornu. Preg- 

 nancy was possibly established at the first ovulation of the last sexual cycle. The two corpora lutea 

 of approximately the same age represent either a simultaneous ovulation or, more probably that the 

 whale had ovulated once unsuccessfully, and become pregnant at the second ovulation of the previous 

 dioestrous cycle. It is of interest to note that in spite of previous pregnancies a tag representing the 

 remnant of the vaginal band was present in this whale. 



No. 2033. Length 13-66 m. 27. xii 28. South Georgia. Pregnant. One ovary contained a corpus 

 luteum a of mean diameter 14 cm., and two corpora lutea b not measured. The other contained two 



