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



Genus LUjeborgia, Spence Bate, 1862. 



1860. Iduna, Boeck, Forh. ved de Skand. Naturf. 8de M0de, p. 656. 

 1862. LUjeborgia, Spence Bate, Brit. Mus. Catal. Amph. Crust., p. 118. 

 1862. „ Bate and Westwood, Brit. Sess. Crust., vol. i. p. 202. 



1864. Amathilla, Grube, Die Insel Lussin und ihre Meeresfauna, p. 74. 



1865. Microplax, Lilljeborg, On the Lysianassa magellanica, p. 18. 

 1870. Lilljeborijia, Boeck, Crust, amph. bor. et arct., p. 74. 

 1876. LUjeborgia, Boeck, De Skand. og Arkt. Amph., p. 496. 



1876. Lilljebonjia, Sars, Prodromus descr. Crust, et Pycn. Exp. Norv., p. 355. 



1880. Eusirus, Haswell, Proc. Linn. Soc. N.S.W., vol. iv. p. 331. 



1880. LUjeborgia, Nebeski, Beitrage zur Kenntniss der Amph. der Adria, p. 34. 



1882. Eusirus, Haswell, Catal. Australian Crust., p. 247. 



1882. Lilljebonjia, Sars, Oversigt af Norges Crustaceer, pp. 27, 106. 



1885. ,, Cams, Prodromus Faunas Mediterranean, pars ii. p. 411. 



1886. „ Gerstaecker, Bronn's Klassen und Ordnungen, Bd. v. Abth. ii. p. 501. 



For an account of Iduna see Note on Boeck, 1860 (p. 324). Iduna being pre- 

 occupied has been superseded by LUjeborgia, for the original definition of which see 

 Note on Spence Bate, 1862 (p. 333). In 1865, Lilljeborg, unaware of the identity of 

 Spence Bate's genus with Boeck's, changed Iduna into Microplax, which he placed in 

 his third subfamily " Gammarina, Dana," and defined as follows : — 



" Antenme superiores flagello appendicular! praxlitse. Caput antice non productum. 

 Pedunculus antennarum superiorum mediocris et segmenta ejus ultima duo elongata. 



"Pedes maxillares laminis interioribus praxliti, laminaeque hse et exteriores minimse 

 et interiores vix basin palpi assequentes. Mandibular inter se similes." 



Boeck in 1876 gives the following definition of LUjeborgia, for which in the list of 

 errata he substitutes the erroneous spelling LUljeborgia : — 



"Mandibles apically strongly dentate ; molar tubercle obsolete. 



" Upper Antennas shorter or little longer than the peduncle of the Lower; the 

 accessory flagellum very long. 



" First Gnathopods with the hand a little smaller than that of the Second pair, but 

 of similar shape ; the wrist rather short, produced into a heel behind and downwards. 



" The Fourth Perseopods longer than the Third, and the Fifth than the Fourth. 



" The Telson cleft to the base." 



The last character must be modified as at any rate not applicable to all the species 

 within the genus ; it may be changed into — Telson more or less cleft. Lilljeborg's 

 statement that the mandibles are alike is not entirely accurate, since the secondary plate 

 on the right mandible is very different from that on the left. 



LUjeborgia consanguinea, n. sp. (PI. XCL). 



Rostrum narrow, sharply pointed, not half the length of the first joint of the upper 

 antenna?, lateral lobes of the head narrow, distally rounded, outdrawn between the upper 



