This little khown and peculiar species was first described by Purcell in 1898 from Walvis Bay. The eyes are unusually far back on the carapace, twice as far from its anterior as from its posterior margin. The superior terminal process on the postetior tarsi of legs is very thick and the claws are peculiar in being of different lengths and, unlike those of most species, long and aImost straight, resembling in this respect O. adustus longiceps Lawrence from Orangemund. The peculiar claw character at least must I think be attributed to an existence on sand.