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



thopsis, Cleippides, and Laothoes. In his later work, 1872-187G, lie retained these 

 two subfamilies as respectively the sixth and seventh of the GaminaridaB, only changing 

 the preoccupied name Lampra into Tritseta, and almost uniformly printing the name of 

 the subfamily as Dexaminas, even when referring to the earlier work in which it is 

 Dexamininae. In 1882 Sars established, though without defining, the family Atylidse, 

 placing in it the genera Lampra, Dexamine, Atylus, Halirages, Calliopius, Amphi- 

 thopsis, Laothoes, no doubt omitting Pontogeneia and Glei'p'pides only because they 

 were not included in the fauna with which he was concerned. 1 If Boeck's definition of 

 the Dexamininse were correct, it would be proper to uphold that group as distinct, for he 

 states that in it the mandibles are without palp, the first maxillas have a one-jointed 

 palp, and the maxillipeds are without the last joint of the palp, whereas in all these 

 particulars the Atylinse are normal. But of these three important characters of the 

 Dexaminina? two seem not to be constant, since in Tritseta kergueleni at any rate the 

 palp of the first maxilla? is apparently two-jointed, and in Dexamine JUndersi the ungui- 

 form fourth joint is certainly present on the palp of the niaxillipeds. 



Genus Halirages, A. Boeck, 1870. 



1870. Halirages, Boeck, Crust, am ph. bor. et arct., p. 114. 



1876. „ Boeck, De Skand. og Arkt. Amph., p. 337. 



187G. „ Sars, Prodromus descriptionis Crust, et Pyen., p. 357. 



1877. ,, Meinert, Crust. Isop. Amph. et Decap. Danise, p. 117. 

 1880. Fherusa, Nebeski, Beitraige zur Kenntniss der Amph. der Adria, p. 36. 

 1882. Halirages, Sars, Oversigt af Norges Crust., p. 102. 



1884. ,, J. S/Schneider, Crust, og Pycn. Kvamangsfjorden, p. 102. 



1885. Fherusa (pars), Carus, Prodromus Faunre Mediterrauese, Pars ii. p. 404. 



1885. Halirages, Sars, Den norske Nordhavs-Exp., p. 172. 



1886. Atylus, Gerstaecker, Bronn's Klassen und Ordmmgen, Bd. v. Abth. ii. p. 507. 



For the original definition of the genus see Note on Boeck, 1870 (p. 401). 



Boeck, it will be observed, says that " the mandibles have the palp elongate, the third 

 joint shorter than the second," yet in describing Halirages fulvocinctus, M. Sars, he 

 rightly says that the palp's third joint is a little longer than the second ; the statement 

 in the definition, that the back is not carinate, is not essential, and would not suit the 

 species now to be included ; the statement that the upper antennae are shorter than the 

 lower may be less rigidly expressed by saying that they are not longer ; Boeck's further 

 statement that the third uropods have a peduncle longer than the telson is not in 

 agreement with Llalirages huxleyanus, but neither is it with LLalirages inermis, Sars, 

 nor apparently with Halirages tridentatus, Bruzelius, if I rightly understand Boeck's 

 own remark upon the proportions in that species ; it should therefore be omitted from 



1 Oversigt af Norges Crustaceer. 



