1006 THE VOYAGE OF H.M.S. CHALLENGER. 



1789. Gammarus, Abildgaard, Miiller's Zoologia Danica, vol. iii. p. 33. 



1791. „ Olivier, Hist. Nat. Insectes, torn. vi. p. 182. 



1793, Fabricius, Entom. Syst. emendata et aucta, torn. ii. 



1796. Cancer (Gammarellus), Herbst. Versuch einer Naturgescbicbte der Krabben und Krebae, Bd. ii. 



1796. Gammarus, Latreille, Precis des Caract. generiques des Insectes. 



1798. „ Fabricius, Suppleaientum Entomologies Systematicae. 



1801. ,, Lamarck, Systeme des Animaux sans vertebres, p. 164. 



1802. „ Bosc, Hist. Nat. des Crustac<5s, tome i. p. 78, tome ii. p. 139. 

 1802. Cancer Gammarus, Turton's Translation of Gmelin's Linnajus, vol. iii. 

 1802. Gammarus, Latreille, Hist. Nat. des Crustaces et des Insectes, tome iii. 



1805. ,, Viviani, Phosphorescentia maris. 



1806. „ Dunieril, Zoologie Analytique. 



1806. „ Latreille, Genera Crustaceorum et Iusectorum. 



1808. Cancer Gammarus, Montagu, Trans. Linn. Soc. Lond., vol. ix. p. 93. 



1810. Gammarus, Latreille, Consid. gen. Crust. Arachn. Insectes, p. 103. 



1813. ,, Leacb, Crustaceology, Edinburgh Encyclopedia, vol. vii. p. 402. 



1814. ,, Leach, Crustaceology, Appendix, Edinburgh Encyclopaedia, vol. vii. p. 432. 



For the original definition of the genus Gammarus, see Note on Fabricius, 1775 

 (p. 40). From the time of Leach the genus has been so universally accepted (for more 

 or less numerous species) by writers on the Amphipoda, that it is scarcely necessary 

 here to continue the synonymy, a clue to which will be found in the index. The 

 following definition is given by Boeck in 1876 : — 



" Mandibles with the third joint of the palp elongate, narrow. 



" First Maxillae with the inner plate broad, long, furnished on the inner margin 

 with very many plumose setse. 



" The body not carinate. The three hinder segments of the pleon furnished hi the 

 middle with fascicles of spines. The anterior side-plates of moderate size. 



" Upper Antennas longer than the Lower ; the peduncle moderately elongate. 



" Lower Antennas with a short flasjelluni. 



" First and Second Gnathopods with the hand small ; the Second larger than the 

 First. 



" The Third Uropods with long rami, furnished on the margin with spines and 

 plumose setse, extending beyond the rami of the two preceding pairs ; the inner ramus 

 more or less shorter than the outer. 



" Telson long, cleft to the base." 



For Dybowsky's definition of the genus, see Note on Dybowsky, 1874 (p. 427). 

 Definitions of later date than Boeck's wUl be found in Carus, Prodromus Faunae Medi- 

 terraneae, p. 411 (1885), and in Gerstaecker, Bronn's Klassen und Ordnungeu, Bd. v. 

 Abth. ii. p. 511 (1886). 



