Westergren, A. - Reports on the scientific results of the expedition to the tropical Pacific, in charge of Alexander Agassiz, by the U. S. Fish Commission steamer "Albatross" from August, 1899, to March 1900, commander Jefferson F. Moser, U. S. N., commanding. XV. Echini. Echinonëus and Micropetalon.

Cambridge, MA, Museum of Comparative Zoology, 1911. 4to. 28 pp., 31 lithographed plates of which one coloured. Original printed wrappers. = Detailed monograph on some irregular sea urchins with fine plates, of the whole animals, anatomical details, and sculpture details. Uncut. Wrappers a bit chipped (rear, spine), otherwise a very good clean copy.

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