THE SPERM WHALE 139 



No. D 23. Length 107 m. 16. vi. 30. Durban. Lactating. One ovary weighed i lb. and con- 

 tained three corpora lutea b of mean diameter 2-25, 175 cm. and less. Some follicles were visible 

 below the surface. The other ovary weighed 14 oz. and contained two corpora lutea b, one of mean 

 diameter 1*25 cm. and the other small and old. The uterus was involuted, and the mammary gland 

 was lactating. The largest corpus luteum b was that of the last pregnancy, and the four older ones 

 probably represent at least one previous pregnancy. 



No. D 25. Length 10-4 m. 17. vi. 30. Durban. Resting(?). One ovary showed three corpora 

 lutea b, two of mean diameter about i cm. and the other very small. The other ovary showed no 

 indications of corpora lutea. The ovaries were, however, badly decomposed, and their exact state is a 

 matter of some doubt. The uterine cornu measured 24 cm. across and the mammary gland was 

 lactating slightly. The whale was probably resting at the end of lactation, but the size of the uterus 

 points towards the possibility of approaching ovulation. 



No. 932. Length lo-o m. 10. viii. 26. Saldanha Bay. Pregnant. One ovary contained a corpus 

 luteum a of mean diameter 8-5 cm. and four corpora lutea b of mean diameters 2-5, 2-3, i-6, 1-5 cm. 

 The other ovary contained six corpora lutea b of mean diameters 2-8, 2-1, i-8, i-6, i-i and 0-9 cm. 

 Both ovaries contained many tiny follicles of 3-4 mm. diameter. The whale was pregnant with a 

 foetus 3-05 m. long and was not lactating. This whale was evidently a multipara. 



No. D 151. Length 97 m. 26. viii. 30. Durban. Pregnant. One ovary weighed i lb. 9 oz. and 

 contained a corpus luteum a of mean diameter 7-8 cm. and 1 1 oz. weight. It contained two corpora 

 lutea b of mean diameter 17 and 1-4 cm. No follicles were visible in it. The other ovary weighed 

 I lb. I oz. and contained five corpora lutea b, the largest two measuring 2-0 and 1-5 cm. in mean 

 diameter and being younger than the corpus luteum b measuring 17 cm. in diameter in the other 

 ovary. The remaining corpora lutea were old and small. A few follicles were visible below the sur- 

 face of the ovary. A foetus 0-2 m. long was present. The pregnant cornu of the uterus measured 

 25 cm. across and the non-pregnant one 23 cm. The vulva was filled with mucus. The mammary 

 gland was lactating very slightly. This whale was a multipara and lactation from the previous preg- 

 nancy was overlapping the beginning of the present one. 



No. D 152. Length lo-i m. 26. viii. 30. Durban. Resting. The ovaries weighed i lb. each. One 

 contained nine corpora lutea b, the largest of mean diameter 27 cm., the rest old and resorbed. The 

 other ovary contained four corpora lutea b, all old and resorbed. A few follicles up to 15 mm. in 

 diameter were visible below the surface. Lactation was slight and the nipples were protruded. This 

 whale, a multipara, was near the end of lactation, and the approach of the next sexual cycle was in- 

 dicated by the presence of enlarging follicles. 



No. D 153. Length 97 m. 26. viii. 30. Durban. Pregnant. One ovary weighed i lb. 5 oz. and 

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

 2-1 cm. The other ovary weighed 9 oz. and contained one corpus luteum b of mean diameter 2-8 cm. 

 No follicles were visible in either ovary. A foetus 1-55 m. long was present. The vulva was full of 

 mucus and the mammary gland was involuted. This whale, although it had only ovulated three 

 times, was in at least its second pregnancy, and possibly its third. 



No. D 156. Length 11-3 m. 26. viii. 30. Durban. Ovulating. One ovary weighed i lb. 8 oz. and 

 contained a corpus luteum a of mean diameter 4-1 cm. containing a large cavity and composed of 

 young luteal tissue. Many follicles up to 30 and 40 mm. in diameter projected from the surface. 

 Four old corpora lutea b were also present. The other ovary weighed i lb. 3 oz. and contained seven 

 corpora lutea b, all old and resorbed. A fair number of follicles up to 25 mm. in diameter projected 

 from the surface of the ovary. The uterine cornua both measured 17 cm. across and the mammary 

 glands were involuted. This whale, a multipara, had just ovulated and may have been in the earliest 

 stages of pregnancy. 



No. D 157. Length 9-8 m. 26. viii. 30. Durban. Ovulating. One ovary weighed 15 oz. and con- 

 tained a corpus luteum a of mean diameter 5-1 cm. with a large cavity and composed of very young 

 luteal tissue. There were three corpora lutea b, the largest of mean diameter 2-i cm., the others old 



