Scientific Reports of the Whales Research Institute (1975)


(…) This 114 cm male specimen had a small hole in the genital aperture just in between the anus and the penis opening. Investigating with a surgical tool, the examiner felt the cavity was about 2 cm deep and had closed end. Then Nishiwaki was invited to join the examination. The opening hole was on the center line of ventral surface and looked like a small vagina. Al dissection, it was found that the hole was the opening of a blind sac 3 mm in diameter and 24 mm in length inside. The sac narrows immediately at the close end and connected to the hind part of the urinary bladder with thin connective tissue. There was no organ such as uterus or ovaries besides it nor any gland found around the sac by naked eyes. (…)