XX.—Descriptions and figures of deep-sea sponges and their spicules, from the Atlantic Ocean, dredged up on board H.M.S. ‘Porcupine,’ chiefly in 1869 (concluded)

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(1876). XX.—Descriptions and figures of deep-sea sponges and their spicules, from the Atlantic Ocean, dredged up on board H.M.S. ‘Porcupine,’ chiefly in 1869 (concluded) Annals and Magazine of Natural History: Vol. 18, No. 105, pp. 226-240.