54 On a new African Fish. 



VI. — Description of a new African Fish of the Oenus 

 Clarias//'o??i Lake Rukwa. By G. A. BouLENGEK, F.R.S. 



(Published by permission of the Trustees of the British Museum.) 



Little is known of the fislies of Lake Rukwa, south-east 

 of Lake Tanganyika. Twelve species have been enumerated 

 by Hilgendorf and Pappenlieiiu (Sitzb. Ges. naturf. Fr. 

 Berl. 1903, p. 259), the determinations of some of which 

 appear to be in need of revision. On the occasion of a recent 

 visit Mr. F. H. Mellard has been so good as to preserve a few 

 fish for the British Museum ; among these I may notice 

 Amj^hiUus platychir, Gthr., C^or^as ^anVpmws, Burch., and a 

 new Glorias which I propose to name, in memory of the late 

 Prof. Franz Hilgendorf, 



Clarias MJgendorfi. 



Depth of body 6^ times in total length, length of head 4f 

 times. Head 1| times as long as broad, smooth ; occipital 

 process longer than broad, acutely pointed ; frontal fontanelle 

 sole-shaped, 2^ times as long as broad ; occipital fontanelle 

 narrow, elongate, partly on occipital process ; eye very small, 

 3 times in length of snout, 6 times in interorbital width, 

 which is a little less than ^ length of head ; band of prse- 

 maxillary teeth not quite 4 times as long as broad ; vomerine 

 teeth granular, forming a curved band which is nearly as 

 broad as the prsemaxillary band ; nasal barbel | length of 

 head, maxillary Ij, outer mandibular nearly 1, inner man- 

 dibular |. Gill-rakers few, 12 on first arch. Clavicles 

 concealed under the skin. Dorsal 73, its distance from 

 occipital process \ length of head. Anal 62. Dorsal and 

 anal extending almost to the very root of the caudal. Pectoral 

 not quite ^ length of head, spine short, strongly serrated on 

 both sides. Ventrals very small, 1| times as far from caudal 

 as from end of snout. Caudal ^ length of head. Uniform 

 blackish brown ; caudal with a narrow light edge. 



Total length 130 mm. 



A single specimen. 



Allied to 01. Iceviceps, Gill. Distinguished by the granular 

 vomerine teeth, fewer gill-rakers, fewer dox'sal and anal rays, 

 and a longer and narrower occipital process. 



