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 the head. The height of the body is contained $2 3⁄5$ times in the total length (without caudal), the length of the head four times. Caudal peduncle slender, much shorter than the head (measured from the last anal ray), its depth being contained $2 2⁄3$ times in its length. The origin of the dorsal fin is behind that of the anal and midway between the root of the caudal and end of the opercle. The anal extends also further backwards than the dorsal. Pectoral fin shorter than the head, reaching rather beyond the middle of the ventral. Ventral fin only half as long as the pectoral or as the distance of its root from the vent. Scales of moderate size; there are twelve or thirteen in an oblique series running from the first anal ray to the lateral line, and three and two half longitudinal series on the side of the caudal peduncle. Silvery, brownish above; anterior part of the dorsal blackish.

There are some slight discrepancies between this and Sauvage's descriptions, which are quite within the limits of individual variation. Besides, our specimens from Talagouga belong to the same district as Sauvage's, which came from Doumé (Ogowé). Steindachner's description is more precise and his figure more accurate; he compared the species with M. Sauvagii (Blgr.), which, however, has a much wider mouth. The specimens described by Steindachner came from Liberia. Thanks to Dr. Jentink's kindness I have been able to compare the latter with those collected by Miss Kingsley.

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Mormyrus (Petrocephalus) Sauvagii, Boulenger, Ann, & Mag. Nat. Hist. 1887, xix. p. 149.

Warri.

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Petrocephalus affinis, Sauvage, Bull. Soc. Philm. 1878, p. 101.

Mormyrus (Petrocephalus) affinis, Sauvage, N, Arch. Mus. iii. 1880, p. 52, pl. ii. fig. 2.

I refer a young specimen, 86 millim. long, from Talagouga