1911 Encyclopædia Britannica/St Paul's Rocks

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ST PAUL’S ROCKS, a number of islets in the Atlantic, nearly 1° N. of the equator and 540 m. from South America, in 29° 15′ W. The whole space occupied does not exceed 1400 ft. in length by about half as much in breadth. Besides sea-fowl the only land creatures are insects and spiders. Fish are abundant, seven species (one, Holocentrum sancta pauli, peculiar to the locality) being collected by the “ Challenger ” during a brief stay. Darwin (On Volcanic Islands) decided that St Paul’s Rocks were not of volcanic origin; later investigators maintain that they probably are eruptive.

See Reports of the Voyage of H.M.S. Challenger: Narrative of the Cruise, vol. 1.