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Show 1901.] FISHES OF THE NIGER DELTA. 5 species distinct from Calamichthys seems to me removed by the fact that I have carefully compared this specimen with others likewise from the Niger delta, without being able to detect any other important difference. I look upon it as an atavistic individual anomaly. M O R M Y R I D J E. 2. ISICHTIIYS H E N R Y I Gill. The single specimen is more elongate than any on record, the depth of the body being contained 13 times in the total length, the length of the head 8| times. D. 53 ; A. 5 2 ; lat. 1. 140. Total length 210 millim. 3. MARCUSENIUS LONGIANALLS, sp. n. (Plate 111. fig. 1.) Depth of body 5 to 5 | times in total length, length of head 6 to 6| times. Head 1| as long as deep ; snout convex, | length of head, slightly projecting beyond the mouth; latter small, sub-inferior, below level of eye, its width ^ length of head ; teeth feebly notched, 5 in the upper jaw, 6 in the lower; nostrils nearly equally distant from end of snout and from eye, anterior on a level with centre of latter, posterior with its lower border ; eye small, | length of snout, f-interorbital width. Dorsal 15-16, its length ] its distance from the head, originating above 16th or 17th ray of anal. Anal 32-33, thrice as long as dorsal, nearer base of caudal than base of ventral. Pectoral obtusely pointed, a little shorter than head, 1| length of ventral, reaching base of latter. Caudal scaly at the base, with pointed lobes. Caudal peduncle 3| times as long as deep, nearly as long as head. 63 to 6G scales in the lateral line, ^ in a transverse line on the body, ~ between dorsal and anal, 12 round caudal peduncle. Purplish brown, more or less profusely speckled with blackish ; fins dark brown. Total length 145 millim. Two specimens. Closely allied to M. brachyhistius Gill. Distinguished by the more elongate form, the more slender caudal peduncle, the longer anal fin, and the higher number of scales in the lateral line. NOTOPTERLD.E. 4. NOTOPTERUS AEER Gthr. PHRACTOL^EMID^. The highly remarkable fish discovered by Dr. Ansorge, which I here describe under the name of Phractolcemus ansorgii, cannot be incorporated into any of the families known at present. It falls into the suborder Malacopterygii as restricted and defined by m e \ and occupies a position intermediate between the Osteoglossida' and the Glupeidxe. The family Ph '-actolcemidce may be chai'acterized as follows :- Mouth edentulous, projectile, bordered by the very slender 1 Poissons du Bassin du Congo, p. 44 (19011. |