A current is an extension of the same medium and the animals in it may suffer no change during even a long voyage, since they may be brought from one litoral to another where they will still be in the same or but slightly altered environment.
"Darwin and Modern Science"
A.C. Seward and Others
The litoral of the Sahara was in those days, we may presume, from the accounts we have far later from Leo Africanus and Arab writers, more luxuriant and heavily populated than it is at present.
"West African studies"
Mary Henrietta Kingsley