218 On Barbus eutaenia and B. holotsenia. 



fissures opening under the sea. In the caves of Lanza rote 

 the communication with the sea is more direct, and, partly 

 perhaps on account of the minimal rainfall, the water is salt. 

 The entrance of marine forms would therefore be compara- 

 tively easy, there being no outflow of fresh water from the 

 submarine fissures as is generally the case. 



XXXII, — Barbus eutsenia and B. holotsenia, new Names for 

 Barbus Kessleri, Gtintker nee Steindachner. By G. A. 

 BOULENGER, F.R.S. 



In accordance with the nomenclature in the British Museum 



* Catalogue of Fishes,' I have hitherto designated as Barbus 



Kessleri, Stdr., a little fish common in West Africa, from 



Cameroon to the Congo. On recently receiving a small 



collection made by Dr. Ansorge in Angola, I have discovered 



that a curious inversion of names has taken place in 



Dr. Giinther's 'Catalogue ' (vii. p. 107), where specimens from 



riuilla, Angola, and "River Ogome" [read Ogowe] are 



described as B. Kessleri, Steindachner, whilst the true 



B. Kessleri is described on the same page as a new species, 



B. candimacida, from specimens from " Polungo Alto " 



[read Golungo Alto]. The name B. caudimacula, Gthr., is 



a synonym of B. Kessleri, and as no name is available for 



B. Kessleri^ Gthr., from Angola, I propose that of B. eutcenia^ 



in allusion to the sharply defined black lateral band passing 



through the eye and extending on the caudal fin. In 



B. euto^nia the origin of the dorsal fin is a little behind the 



vertical of the first ventral ray, whilst in B. Kessleri the two 



exactly correspond. Dr. Giinther has pointed out in 1896 



(Ann. & Mag. Nat. Hist. xvii. p. 277) that specimens from 



the Ogowe have the barbels longer than those from Angola. 



As stated in my description in ' Poissons du Bassin du Congo/ 



p. 225, the posterior barbels are ahvays considerably longer 



than the eye in the Ogowe-Congo specimens, which differ 



besides from B. eutmnia in having the spine of the dorsal fin 



w'eaker, sometimes without serration, the origin of the dorsal 



fin opposite to that of the ventrals, and a black spot at the 



end of the dorsal fin. I propose the name Barbus holotcenia 



for this species. 



