PEOM THE LAKE NGAMI BASIN", BECHUANALAND. 405 



Clavicles striated, distinct under the thin skin. Dorsal 60, its distance from occipital 

 process ^ length of head, its distance from caudal fin ^. Anal 50, narrowly separated 

 from caudal. Pectoral not quite ^ length of head, its spine serrated on the outer 

 border and f the length of the fin. Ventral equally distant from end of snout and 

 from caudal. Caudal fin ^ length of head. Olive, marbled with darker ; belly white. 



The single specimen measures 245 mm. 



This fish comes very close to Clarias mellandi Blgr., described from a single 

 specimen from L. Bangwelu, and might be referred to it but for the difierence in the 

 shape of the patch of vomerine teeth. As this is, however, a character which varies 

 with age, I should have felt inclined to suggest uniting CI. mellandi with CI. ngamensis 

 were it not that the type of the latter is larger (460 mm.) than that of the former 

 (245 mm.), and yet, judging from Castelnau's description, the condition of the 

 vomerine teeth, " en forme de zone transversale," agrees with that seen in the small 

 specimen brought home by Mr. Woosuara. 



8. Claeias THEODORiE M. Weber. 



The specimens in Mr. Woosnam's collection are in some respects intermediate 

 between CI. theodorm, known from Natal, Zululand, and the Upper Zambesi, and 

 CI. foiilonilSlgr. from L. Bangwelu. Ventral 1^ to If times as distant from caudal 

 as from end of snout. Nasal barbel f to f length of head, maxillary f to once. 

 Clavicles striated, covered with thin skin. Pectoral spine feebly serrated on outer 

 side. Dorsal 80-84. Anal 70-72. 



9. SCHILBE MYSTUS L. 



10. AUCHENOGLANIS NGAMENSIS. 



Bouleng. Cat. Afr. F.W. Fishes, ii. p. 371, fig. 

 Depth of body 5J times in total length, length of head 3^ times. Head moderately 

 depressed, 1^ times as long as broad, upper surface smooth ; operculum with radiating 

 striae ; occipital process small, longer than broad, in contact with the moderately large 

 interneural plate ; snout pointed, ^ length of head ; eye supero-lateral, 8 times in 

 length of head, twice in interorbital width ; mouth small, nearly terminal, with thick 

 papillose lips ; prgemaxillary teeth in a small patch a little broader than long, with 

 notched posterior border. Maxillary and inner mandibular barbels ^ length of head; 

 outer mandibular slightly shorter than head, reaching base of pectoral fin. Gill-rakers 

 rather long, 8 on lower part of anterior arch. Humeral process short, triangular, 

 feebly striated. Dorsal I 7 ; spine moderately strong, smooth, ^ length of head, as 

 long as longest soft rays. Adipose dorsal 9 times as long as deep, originating 

 immediately behind rayed dorsal and extending nearly to root of caudal. Anal 13 



