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Show 1900.] FROM THE FALKLAND ISLANDS. 537 the fingers are rather longer than the palm, and certainly not filiform. The subchelate penultimate legs have the penultimate joint broad and flat, with a very narrow rasp. Mr. Vallentin's specimen was obtained from " root of kelp, 3 fms., Stanley." SCHIZOPODA. 1817. Schizopoda, Latreille, Eegue Animal, vol. iii. 1827. Schizopoda, Latreille, Eegne Animal, Nouv. ed., vol. iv. p. 99. 1867. Schizopoda, Sars, Crust, d'eau douce de Norvege, p. 11. 1885. Schizopoda, Sars, ' Challenger' Schizopoda, Eeports, vol. xiii. In 1883 Boas, Morphol. Jahrb. vol. viii. pp. 487, 569, in place of the Schizopoda, adopts two orders, the Euphausiacea and the Mysidacea. In this he is followed by Ortmann, ' Ergebnisse der Plankton-Expedition der Humboldt-Stiftung,' vol. ii. 1893, who explains that in using " Decapoden und Schizopoden " for the titular heading to his work, he is only making a concession to long established usage. The advantage gained by cancelling the name Schizopoda is not easy to perceive, with full allowance made for the importance of the differences between the two groups which it has long conveniently embraced. Claus in 1863, Zeitschr. fur wiss. Zool. vol. xiii. pt. 3, p. 442, suggests the names Thysanopodea or Euphausidea for a group to be distinguished from the Mysidea; but probably he only intended to give the names of families, which should rather be Thysanopodidse or Euphausiidae, and Mysidae, respectively. His reason for proposing Thysanopodea is obvious, inasmuch as Thgsanopoda Milne-Edwards is far older than its companion genus Euphausia Dana. Fam. EUPHAUSIIDAE. 1852. Euphausidce, Dana, U.S. Expl. Exp. vol. xiii., Crust, p. 636. 1883. Euphausiidce, Sars, Christiania Vidensk.-Selsk. Forh. no. 7, p. 11. 1885. Euphausiidce, Sars, 'Challenger' Schizopoda, Eeports, vol. xiii. pp. 10, 62. 1885. Euphausiidce, Norman, Ann. Mag. Nat. Hist. ser. 6, vol. ix. p. 456. 1893. Euphausiidcx, Stebbing, Hist. Crust., Internat. Sci. Ser. vol. lxxiv. p. 261. 1893. Euphausiidce, Ortmann, Decapoden u. Schizopoden, Plank-ton- Exp. vol. ii. p. 7. To Thysanopoda Milne-Edwards, Euphausia Dana, and Thysa-noessa Brandt, Sars has added Nyctiphanes, Nematoscelis, Stylo-cheiron, and Bentheuphausia, and Caiman in 1896 added Nemato-dactylus. The distinguishing feature of the family is found in the |