Two side-by-side, head-to-tail. They were probably in a mating behaviour; nudis are both male and female, and they exchange sperm only which they use to fertilise their own eggs. Now that's true equality of the sexes!
2 nudibranch drawings (4 x 7 cm. and 4 x 8 cm.)Repository: Ernst Mayr Library, Museum of Comparative Zoology, Harvard UniversityCall number: bAg 15.60.4 (9A)u