"HALICARCINUS PLANATUS (Fabr.), White.
Plate 24, fig.7 a, animal, enlarged; b, outer maxilliped.
Nassau Bay, Tierra del Fuego, abundant.
Length of carapax, four to five lines. Colour, mostly dark reddish brown, somewhat clouded. Carapax transversely orbiculato-elliptical. Upper surface of carapax smooth. Feet slender and very nearly naked. Tarsus of eight posterior legs but little shorter than preceding joint and nearly straight, short hirsute within. Second and third joints of outer maxillipeds nearly equal, surface pubescent. Buccal area nearly square.
Leucosia planata, FABR., Ent. Syst., Suppl., 350.
Haticarcinus planatus, WHITE, Ann. Nag. Nat. Hist., xviii. 178, 1846, pl. 2, f. 1.
Hymenosoma Leachii, GUERIN, Icon., pl. 10, f. 2, and Voy. de la Coquille, ii. 22.
Hymenosoma tridentatum ? HOMBRON and JACQUINOT, Voy. au Pole Sud, pl. 5, f. 27. This figure is referred to the planatus by White; but the form as represented, is more transverse; and as no description has yet been published, we feel still uncertain as to its identity with the above."
(Dana, 1852)
