I40 DISCOVERY REPORTS 



and small. No follicles were visible. The other ovary weighed 14 oz. and contained four old resorbed 

 corpora lutea b. Some follicles up to 15 mm. in diameter were visible below the surface. No foetus 

 was found. The vulva was swollen and the mammary glands were lactating, but not freely. This 

 whale, as No. D 156, was therefore a multipara which had just ovulated or was in the earliest stages 

 of pregnancy. 



No. D 158. Length 9-95 m. 26. viii. 30. Durban. Pregnant. One ovary weighed i lb. 14 oz., 

 and contained a corpus luteum a of mean diameter 8-i cm. and one corpus luteum b of mean dia- 

 meter 1-75 cm. No follicles were visible. The other ovary weighed 8 oz. and contained two corpora 

 lutea h, both old and resorbed and older than the corpus luteum b on the other ovary. One large 

 follicle about 40 mm. in diameter projected on the surface. A foetus 2-6 m. long was present. The 

 pregnant cornu of the uterus measured 54 cm. across and the non-pregnant one 49 cm. The vulva 

 was open and full of mucus. The mammary glands were involuted. This whale was probably about 

 halfway through pregnancy, and the reason for the presence of the large follicle in one ovary is dif- 

 ficult to find. It was probably an enlarged follicle remaining over from the previous sexual cycle and 

 in process of resorption. 



No. D 176. Length 9-6 m. 12. ix. 30. Durban. Pregnant. One ovary contained a corpus luteum 

 a 10 cm. in mean diameter and 11 oz. in weight. There was one corpus luteum b of mean diameter 

 2-3 cm. ; no follicles were visible. The other ovary weighed 13 oz. and contained two corpora lutea b, 

 one 4-0 cm. diameter, the other old and resorbed. A foetus 1-5 m. long was present. The mammary 

 glands were involuted. This whale had been pregnant before. 



No. D 177. Length 10-9 m. 12. ix. 30. Durban. Ovulating. One ovary weighed i lb. 8 oz. and 

 contained a corpus luteum a 8-i cm. in mean diameter and 10 oz. in weight. There were four old 

 resorbed corpora lutea b. No follicles were visible. The other ovary weighed 13 oz. and contained 

 eight corpora lutea b, the largest two of mean diameter 2-4 and 2-0 cm. respectively, the rest old and 

 resorbed. The mammary glands were involuted and no foetus was found. This whale was a multipara 

 and had either just ovulated or was in the earliest stages of pregnancy. 



No. D 178. Length 10-2 m. 12. ix. 30. Durban. Pregnant. One ovary weighed i lb. 4 oz. and 

 contained a corpus luteum a 8-8 cm. in mean diameter and 1 1 oz. in weight. The largest of the three 

 corpora lutea b was 3-3 cm. in mean diameter. No follicles were visible. The other ovary weighed 

 9 oz. and contained one corpus luteum 6, old and resorbed. No follicles were visible. A foetus 

 3-15 m. long was present and the mammary glands were involuted. This whale, a multipara, was 

 advanced about three-quarters through pregnancy. 



No. D 179. Length io-6 m. 12. ix. 30. Durban. Pregnant(?). One ovary weighed i lb. i oz. and 

 contained a corpus luteum a of mean diameter 9-5 cm. and 13 oz. in weight. There were four corpora 

 lutea b, the largest 3-1 cm. in mean diameter, the rest old and resorbed. No follicles were visible. 

 The other ovary weighed 10 oz. and contained four corpora lutea b, all old and resorbed. Several 

 small follicles projected on the surface. One uterine cornu measured 30 cm. across, and the other, 

 not measured, was noted as "not congested". The mammary gland was involuted but had recently 

 lactated. No foetus was found, but it appears very likely that this whale was in an early stage of 

 pregnancy because it had recently ovulated, and in addition, one cornu of the uterus was so greatly 

 enlarged. 



No. D 180. Length 9-9 m. 12. ix. 30. Durban. Ovulating. One ovary weighed 15 oz. and con- 

 tained a corpus luteum a 7 cm. in mean diameter and 6 oz. in weight. There was one corpus luteum b 

 of mean diameter 3-3 cm. No follicles were visible. The other ovary weighed 10 oz. and contained 

 one corpus luteum b of mean diameter 2-6 cm.: no follicles were visible. No foetus was found. The 

 uterine cornu on the side of the corpus luteum a was 19 cm. across and the other 18 cm. The mam- 

 mary glands were lactating slightly. This whale was ovulating or in a very early stage of pregnancy, 

 and had been pregnant at least once before, although she had only ovulated twice previously. 



Of these whales two were lactating, seven were pregnant, three were ovulating while 

 lactation had not yet finished, and two were ovulating or in very early pregnancy after 



