Abstract
As an example of the way in which the distribution of marine animals is complicated by ecological factors, I quote four species of nudibranch mollusc, all of which are large and conspicuous, and which, though common in Zanzibar, have been rarely recorded from the Red Sea. I have myself only lately seen specimens, though twenty-three out of the last thirty-five years have been spent on this coast: Asteronotus hemprichi Ehr. One specimen on Sudan coast, 1905 ; one specimen by Dolfuss, in Gulf of Suez, 1927–29 ; two here in 1934.
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