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Show 26 MR. G. A. BOULENGER OX [Jan. 20, which is rounded and projects a little beyond lower jaw; posterior nostril midway between eye and end of snout; praemaxillary teeth forming a very short band, measuring about \ width of mouth; maxillary barbel | length of head, reaching root of pectoral; mandibular barbel \ length of head. Dorsal I 6, nearer end of snout than root of caudal, first ray J length of head. Adipose short, as long as dorsal. Anal I 5, midway between root of ventral and root of caudal. Pectoral a little longer than ventral, \ length of head. Caudal forked. Caudal peduncle 1| as long as deep. Dark olive-brown above, mottled with black, white beneath ; dorsal, pectorals, and ventrals light, with two transverse series of blackish spots ; caudal whitish, with some black spots, black at the base, with a large black blotch on each lobe. Total length 77 millim. A single specimen from hills in the Bulu country, near Efulen. 24. S y x o d o x t is o b e su s Blgr. M ic r o s y x o d o x t is , gen. nov. Closely allied to Synodontis, differing only in the absence of a free orbital border and of suborbital bones, in the more elongate form and the rounded caudal fin, and in the curious modification of the transverse processes of the fourth vertebra. 25. M ic r o s y x o d o x t is b a t e s i i , sp. n. (Plate IV.) Depth of body 5 to 6 times in total length, length of head 4 j to 5 times. Body subcylindrical or feebly compressed in the praecaudal region, strongly compressed behind ; vent in the middle of the total length. Head broader than deep, \\ to 1^ as long as broad, without ridges or keels; skin on vertex, occiput, and nuchal shield adherent to the finely rugose bones; a small frontal fontanelle ; eye directed upwards, in middle of head, its diameter 6 or 7 times in length of head, twice in interorbital width. Lips moderately developed ; maxillary barbel simple, nearly as long as head; mandibular barbels with long, slender branches; outer mandibular barbels 4 length of head, inner Praemaxillary teeth small, forming a villiform band; mandibular teeth much shorter than the eye, 20 to 30 in number. Gill-cleft restricted to the sides. Occipito-nuchal shield a little longer than broad, ending in two rounded processes. Humeral process narrow, sharply pointed, rugose. Skin smooth. Dorsal I 6 ; spine strong, straight, striated but not serrated, about -J length of head. Adipose dorsal low, elongate, 2 to 3 times as long as its distance from the rayed dorsal. Anal I I I - IV 8-9. Pectoral spine J to j length of head, strong and striated, with feebly serrate outer edge, with 12 to 17 strong retrorse teeth on the inner side. Ventral not reaching anal. Caudal rounded. Dark brown or blackish, with 5 yellowish cross-bars above, the first on the occiput, the second at the base of the dorsal; the body lower down with round yellowish spots ; throat and belly greyish, spotted or marbled wit1 |