REPORT ON THE AMPHIPODA. 1543 



Tryphana. From Tryphana nordenshioldi, Bovallius, the present species differs in 

 having the second gnathopods decidedly longer than half the first peraeopods, the first 

 perseopods not as long as the fourth, the third perseopods longer than the perseon, the 

 telson not longer than, though projecting a very little beyond, the peduncles of the third 

 uropods. Bovallius' species was taken " off the Fsero Islands at lat. 65° N.," at a 

 great distance therefore further north than the locality of the present species. Bovallius 

 in one description of Tryphana nordenshioldi says, — " Dactylus of first pair of pereiopoda 

 [Gnathopods~\ pedunculated," an expression which does not seem applicable to the 

 Challenger species, but in the absence of a figure I do not clearly understand it. The 

 type-species, Tryphana mahnii, Boeck, was taken by Boeck in the Hardangerfjord, and 

 by Sars somewhat further north at Folger0en. 



Genus Brachyscelus, Spence Bate, 1861. 



1852. Daira (pars), Dana, U.S. Explor. Exped., vol. xiii. pt. ii. pp. 981, 993. 

 1852. Dairilia (pars), Dana, U.S. Explor. Exped., vol. xiii. pt. ii. pp. 1519, 1596, 1604 (the 

 spelling Dairinia, p. 1442, probably a misprint). 



1861. Brachyscelus, Spence Bate, Ann. and Mag. Nat. Hist., ser. 3, vol. viii. p. 7. 



1862. „ Spence Bate, Brit. Mus. Catal. Amph. Crust., p. 333. 

 1862. Thamyris, Spence Bate, Brit. Mus. Catal. Amph. Crust., p. 335. 



1871. Schnehagenia, Claus, Unters. iiber den Bau und die Verwandschaft der Hyperiden, 

 Nachrichten K. Gott. Soc, p. 157. 



1878. Thamyris, Claus, Zool. Anzeiger, Jahrg. i. p. 270. 



1879. „ Claus, Die Gattungen und Arteu der Platyseeliden, p. 32. 



1885. „ Carus. Prodromus Fauna Mediterranean, pars ii. p. 426. 



1886. „ Gerstaecker, Bronn's Klassen und Ordnungen, Bd. v. Abth. ii. p. 485. 



1887. .. Bovallius, Systematical List of Amph. Hyper., Bihang till K. Svensk 



Vetensk.-Akad. HandL, Bd. 11, No. 16. p. 30. 

 1887. ,. Bovallius, Arctic and Antarctic Hyperids, Vega-Exped., Bd. iv. p. 574. 



1887. „ Claus, Die Platyseeliden, pp. 55, 56. 



Dana's Dairilia being rejected for its inherent obscurity, the name next in order is 

 Brachyscelus, Spence Bate, which was probably set aside by Claus as coming too close 

 to the already occupied Brachyscelis, but, though it is no doubt a disadvantage to have 

 names so nearly alike, it is still more confusing to make the law of priority subject to 

 individual judgment upon the more or less similarity that one name may bear to 

 another. For the original definition of Brachyscelus, see Note on Spence Bate, 1861 

 (p. 327) ; for that of Thamyris, Note on the same author, 1862 (p. 337). For a short 

 definition by Claus of the same genus, see Note on Claus, 1879 (p. 492). It is more 

 fully defined by Claus as follows : — 



" Body with thick, anteriorly rounded head, moderately broad perseon, and narrower 

 elongate pleon. Hinder antennas in the male with long shaft and short terminal joint, 



