. Annals of the South African Museum. Annale van die Suid-Afrikaanse Museum. Natural history. The Freshwater Fishes of South Africa. 327 3. MAECUSENIUS. Petrocephalus, part., Marcusen, Bull. Ac. St. Petersb., xii., 1854, p. 14. Marcusenius, Gill, Proc. Ac. Philad., 1862, p. 129; Bouleng., Cat. Freshw. Fish. Afr., i., p. 60 (1909). Mormyrus, part., Gimth., Cat. Fish., vi., p. 214 (1866). Teeth only in the middle of the jaws, truncate or notched; minute conical teeth on parasphenoid and tongue; mouth inferior or sub- inferior, below level of eyes ; nostrils widely separated. Key to Species. Anal
. Annals of the South African Museum. Annale van die Suid-Afrikaanse Museum. Natural history. The Freshwater Fishes of South Africa. 327 3. MAECUSENIUS. Petrocephalus, part., Marcusen, Bull. Ac. St. Petersb., xii., 1854, p. 14. Marcusenius, Gill, Proc. Ac. Philad., 1862, p. 129; Bouleng., Cat. Freshw. Fish. Afr., i., p. 60 (1909). Mormyrus, part., Gimth., Cat. Fish., vi., p. 214 (1866). Teeth only in the middle of the jaws, truncate or notched; minute conical teeth on parasphenoid and tongue; mouth inferior or sub- inferior, below level of eyes ; nostrils widely separated. Key to Species. Anal originating in advance of dorsal. Teeth f ; D. 16-17, A. 22 ; Lat. 1. 53 .. Teeth £ ; D. 17, A. 23 ; Lat. 1. 48-50 Dorsal originating in advance of anal. Teeth £ ; D. 30-36, A. 23-27 ; Lat. 1. 65-70 .. 1. M. isidori. '2. M. castelnaui. 3. M. discorhynchns. MARCUSENIUS ISIDORI, C. and V. Mormyrus isidori, Cuv. and Val., Hist. Poiss., xix., p. 285 (1846). Petrocephalus isidori, Marcusen, Bull. Ac. St. Petersb., xii., 1854, p. 14. Marcusenius isidori, Bouleng., Proc. Zool. Soc., 1898, p. 798, and Cat. Fresh. Fish. Africa, i., p. 76 (1909). I : -•:•---::,;••-;.v. u •ui'^£ffjM*:'^: - .;. FIG. 5.—Marcusenius isidori. Teeth bicuspid, 8 in the upper 8 in lower jaw. Depth of body 3 to 3^ times in total length excluding caudal, length of head 4 to 4| times; head as long or nearly as long as deep; snout i to T30- length of head, rounded, projecting beyond mouth; mouth situated below nostrils, its width 3f to 4^ times in length of head; anterior nostril in a line with centre of eye, midway between eye and point. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original South African Museum; South African Museum. Annale van die Suid-Afrikaanse Museum. Cape Town [etc. , South African Museum, etc. ]
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