. Catalogue of the fresh-water fishes of Africa in the British museum (Natural history) ... Fishes; Freshwater animals. HETEROBRANCIItrS. 273 1. HETEROBRANOHUS BIDORSALIS. I. Geoffr. Descr. Egypte, Poiss. p. 305, pi. xvi. figs. 2 & 5, & pi. xvii. figs. 8 & 9 (1827) ; Giinth. Petherick's Trav. ii. p. 220 (1869) ; Bouleng. Fish. Nile, p. 300, pi. liv. fig. 1 (1907), and Proc. Zool. Soc. 1907, p. 1095. Heterobranclms geoffroyi, (luv. & Val. Hist. Poiss. xv. p. 392 (1840). Heterobranclms senegalensis, Guv. & Val. t. c. p. 397 ; Steind. Sitzb. Ak. Wien, lx. 1869, p. 980. Heterob
. Catalogue of the fresh-water fishes of Africa in the British museum (Natural history) ... Fishes; Freshwater animals. HETEROBRANCIItrS. 273 1. HETEROBRANOHUS BIDORSALIS. I. Geoffr. Descr. Egypte, Poiss. p. 305, pi. xvi. figs. 2 & 5, & pi. xvii. figs. 8 & 9 (1827) ; Giinth. Petherick's Trav. ii. p. 220 (1869) ; Bouleng. Fish. Nile, p. 300, pi. liv. fig. 1 (1907), and Proc. Zool. Soc. 1907, p. 1095. Heterobranclms geoffroyi, (luv. & Val. Hist. Poiss. xv. p. 392 (1840). Heterobranclms senegalensis, Guv. & Val. t. c. p. 397 ; Steind. Sitzb. Ak. Wien, lx. 1869, p. 980. Heterobranclms intermedins, Giinth. Cat. Fish. v. p. 22 (1864), and 1. c. Depth of body 6 to 9 times in total length, length of head 2-f to 3j times. Head very strongly depressed, 1^ to 1^ times as long as broad, its upper surface coarsely granulate in the adult; occipital process pointed, sometimes very obtusely; frontal fontanelle knife-shaped, 3 to 4 times as long as broad, 3 to 5 times in length of head; occipital fontanelle small, in advance of occipital process; eye 3 (young) to 6^ times in length of snout, 6 to 10^ times in interorbital width ; width of mouth a little less than interorbital width ; band of prsemaxillary teeth about 5 times as long as broad; vomerine teeth also villiform, forming a Fig. HeterobrancJius bidorsalis. "White Nile (F. N.). J-. crescentic band which is 1^ to 1J times as broad as the prsemaxillary band and may have a small central posterior process ; nasal barbel f to once length of head ; maxillary barbel f to If times length of head, extending to extremity of pectoral or between this point and root of ventral; outer mandibular barbel 1-^- to 1J times as long as inner, which measures 1 to li times length of head. Gill-rakers rather short, 20 to 30 on anterior arch. Dorsal 38-45, its distance from occipital process ^s to ^ length of head ; adipose dorsal f to f as long as, as deep as or lower than, and commencing immediately behind, rayed do
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