172 HIALMAR RENDAHL 



1. Copioglanis brevidorsalis Günth. (Ann. Mag. Nat. Hist. 

 1867, vol. XX., p. 66.) 



2. Copidoglanis hyrtlii Steind. (Sitz. Ber. Akad. Wien, 1867 

 p. 14.) 



3. Copidoglanis ater Perugia. (Ann. Mus. Civ. Genova, 2, 

 XIV, 1894, p. 551) = C. mediobarbis Ogilby (Ann. Queensl* 

 Mus., 1908, p. 12.) 



4. Copidoglanis robustus Ogilby. (ibidem, p. 13.) 



5. Silurichthys australis Cast. (Res. Fish. Austr.; quoted after 

 Macleay, Proc. Linn. Soc. N. S. Wales, 1881, p. 211.) 



6. Cainosilurus australis Cast. (Proc. Linn. Soc. N. S. Wales 

 1877, p. 239.) 



7. Plotosus argenteus Zietz. (Rep. Horn. Exped., II, 1896. p. 410.) 



The present new species may i. a. be separated from the 

 above species by the following characters: — 



from C. brevidorsalis i. a. by its considerably shorter nasal 

 barbels and by the different proportions the diameter of the eye 

 and the length of the head, 



from C. hyrtlii by longer nasal barbels and by having the 

 width of the interorbital space subequal to that of the mouth 

 and not more than 1 ^2 times the diameter of the eye, 



from C. ater, the species to which it is evidently nearest 

 allied, by fewer gill-rakers, by having the first dorsal fin not so 

 high as the body below it, and by havmg the interocular 

 space 2,9 times the eye-diameter, the bony interorbital region 

 3,5 — 3,8 times the same, 



from C. robustus by the absence of filaments, less deep 

 body, longer barbels, and narrower interorbital region, 



from the insufficiently described Silurichthys australis by 

 decidedly higher body, and from Cainosilurus australis by the 

 number of barbels, which in the latter are stated to be only six^ 



The description of Plotosus argenteus is very inadequate, 

 so I can but state that my species, compared with the state- 



