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, Regue Animal, vol. iii. 



1827. Schizopoda, Latreille, Regne Animal, Nouv. ed., vol. iv. 

 p. 99. 



1867. Schizopoda, Sars, Crust, d'eau douce de Norvege, p. 11. 



1885. Schizopoda, Sars, ' Challenger ' Schizopoda, Reports, 

 vol. xiii. 



In 1883 Boas, Morphol. Jahrb. vol. viii. pp. 487, 569, in place 

 of the Schizopoda, adopts two orders, the Buphausiacea and the 

 Mysidacea. In this he is followed by Ortmanu, ' 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 estab- 

 lished 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 

 Thysanopodidae or Euphausiidae, and Mysidse, respectively. His 

 reason for proposing Thysanopodea is obvious, inasmuch as 

 Thysanopoda Milne-Edwards is far older than its companion 

 genus Euphausia Dana. 



Earn. Euphausiidce. 



1852. Euphausidce, Dana, U.S. Expl. Exp. vol. xiii., Crust, p. 636. 



1883. Euphausiidce, Sars, Christiania Vidensk.-Selsk. Eorh. 

 no. 7, p. 11. 



1885. Euphausiidce, Sars, 'Challenger' Schizopoda, Reports, vol. 

 xiii. pp. 10, 62. 



1885. Euphausiidce, Norman, Ann. Mag. Nat. Hist. ser. 6, vol. ix. 

 p. 456. 



1893. Euphausiidce, 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 



