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



this genus belong to the deep-sea fauna, although the actual depth to which they may- 

 descend is known in one species only. The other species are known from one or 

 two individuals only, which wore picked up in an exhausted condition floating on the 

 surface. 



The foUowng are the species known of this genus : — 



Trachichthys australis. 



Traehichthys australw, Shaw, Nat. Misc., p. 378. 

 „ „ Giintb., Fish., i. p. 10. 



D3 A 2-3 



Scales small and very rough ; eight or nine abdominal scutes. The height of the 

 body is a little more than one-half of its length, without caudal. Suprascapular spine 

 longer than that of the angle of the praioporculum. A black Ijand along each caudal 

 lobe, the anterior rays of the dorsal and anal fins black. 



Besides the dry typical specimen I have seen only one other, 2 inches long, which 

 also is stated to have come from Australia. 



Trachichthys jacksonicnsis. 



Trachichthys australis, Castelnau, Proc. Linn. Soc. N.S.W., 1879, vol. iii. p. 364. 

 „ jacfisonicimg, Macleay, Ihid, vol. v. p. .511. 



I fully agree with Mr. Macleay that the fish described by Castelnau as Tixichichthys 

 austmlis cannot be that species, provided that the characters are correctly stated. 

 But it is somewhat unfortunate that Mr. Macleay himself has not confirmed the more 

 important of Castelnau's statements. Castelnau states that his specimen had no teeth on 

 the palate ; if that be correct, the fish should be referred to Hoplostethus. 



D. A- A. A- 



Scales rough ; abdominal scutes ten. The height of the body is rather more than 

 one-half of its length, without caudal. Fins coloured as in Trachichthys australis. 



One specimen, 5 J inches long, was found in Port Jackson on the 19th of September 

 1877. 



Trachichthys elongatus (PI. V. fig. C). 



Trarhichthya elongattis, Giinth., Fish., i. p. 10. 



D. /p A. g. L. lat. ca. 65. 



Eleven or twelve abdominal scutes ; the height of the body is one-third of its 

 length, without caudid ; suprascapulary spine very small, niudi smaller than that of the 



