REPORT ON THE AMPHIPODA. 771 



Family LedcothoiD/E. 



In 1852 Dana^ established the Leucothoinse as subfamily 3 of the family Gammaridaj. 

 Ill it he includes the genera Stenothoe and Leucothoe, of which the former was placed by 

 Spence Bate in the subfamily Stegocej)halides, the latter in the subfamily Gammarides. 

 Lilljeborg in 1865 adopts Dana's subfamily, writing the name Leucothoina, and adding 

 the genera Pleustes, Spence Bate, and Montagua, Spence Bate. In 1874 Boeck adopted 

 the name " Leucothoinae, Dana," as the name of the ninth subfamily of the Gammaridte, 

 and in 1876 as the sixth subfamily of the Leucothoidse. In it he placed the genera lAlje- 

 borgia, Spence Bate, Eusirus, Krdyer, Leucothoe, Leach, Tritropis, Boeck, and Pleustes, 

 Spence Bate.^ The last of these genera was transferred to this subfamily by an after- 

 thought, and Boeck's own account of the first side-plates, the third uropods, and the telson 

 in species oi Pleustes does not agree with his definition of the subfamily. In 1882 Sars 

 adopted the name Leucothoidae for a family containing the genera LeucotJioe, Tritropis, 

 Eusirus, " LiUjeborgia," presumably therefore corresponding with Boeck's Leucothoinae, 

 minus the genus Pleustes, which Sars places in the family Paramphithoidse. Why Spence 

 Bate and Boeck and Sars have removed Leucothoe from its proximity to Stenothoe I do 

 not understand. In Leucothoe the third uropods are biramous, in the Stenothoidae 

 uniramous, but the mouth-organs bring the former near to the latter, as Dana and 

 Lilljeborg have evidently felt. Gerstaecker in 1886 places Leucothoe next to Stenothoe. 

 Costa in 1857 assigns to the Leucotoini only the genus Leucothoe, and I am so far in 

 agreement with him that I have not seen reason to place in this family the other genera, 

 assigned to it by Boeck. It must be remembered that the loosely defined family, 

 Leucothoidae, Boeck, in which there is scarcely a single fixed character (almost everything 

 mentioned being either large or small, present or absent), is quite distinct from the 

 subfamily Leucothoinae here changed into the family Leucothoidae in accordance with 

 the precedent set by G. 0. Sars. 



Genus Leucothoe, Leach, 1813. 



1813. Leucothoe, Leach, Edin. Encycl., vol. vii. pp. 403, 432. 



1815. „ Leach, Trans. Linn. Soc. Lond., vol. xi. 



1816. Lycesta, Savigny, M6m. sur les Anim. sans vert., l'" partie, p. 109. 

 1825. Leucothoe, Desmarest, Consid. gen. sur les Crust., p. 263. 



1829. „ Latreille, Le rfegne anim., t. iv. 



1830. „ Milne-Edwards, Ann. d. Sci. Nat., t. xx. p. 380 (29). 

 1840. „ Lucas, Hist. Nat. des Crust., p. 230. 



1840. „ Milne-Edwards, Hist, des Crust., t. iii. p. 56. 



1852. „ Dana, U.S. Explor. Exped., vol. xiii. pt. ii. p. 909. 



1853. „ Costa, Rend. d. Soc. r. Borb. Acad, di scienze. 

 1855. „ Gosse, Manual of Marine Zoology. 



' See Notes on Dana, pp. 257, 261. '^ See De Skand. og Arkt. Amph., p. 496. 



