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Show 1899.] SYRIAN FISHES OF THE FAMILY CICHLID.E. 137 middle dorsal spines longest, about f- length of head and a little shorter than longest soft rays. Pectoral f to 4 length of head, extending to origin of anal. Ventral reaching origin of anal. Anal III 6-7; third spine longest, as long as longest dorsals, slightly shorter than longest soft rays. Caudal truncate. Caudal peduncle slightly longer than deep. Scales finely denticulate on the border, 33-35 ^^ ; lat. 1. ^|. Pale olive, with 10 more or less distinct darker cross-bars; fins greyish broAvn; dorsal sometimes with oblique dark and light streaks ; caudal with numerous round dark spots between the rays. Total length 170 millim. Lake Tanganyika. 57. TILAPIA ZEBRA, sp. n. (Plate XII. fig. 2.) Teeth very small, in 4 or 5 series in both jaws. Depth of body 2 | times in total length, length of head 34-. Snout with straight upper profile, 1| diameter of eye, which is 4 times in length of head and I3 in interorbital width; mouth rather large, f Avidth of head; maxillary extending to below anterior border of eye ; 5 or 6 series of scales on the cheek ; large scales on the opercle. Gill-rakers short, 12 on lower part of anterior arch. Dorsal XVIII 8 ; last spine longest, .| length of head, f middle soft rays, which are produced. Pectoral pointed, as long as head, not extending as far as origin of anal. Outer ray of ventral produced, filiform, extending beyond origin of anal. Anal III 8 ; third spine nearly as long as last dorsal. Caudal rounded (?), densely scaled at the base. Caudal peduncle a little deeper thau long. Scales Avith finely denticulate edge, 31 -^ ; lat. 1. ^=y; scales on occiput and nape very small. Grey, with six dark brown bars ; a crescentic dark brown band on the forehead, from eye to eye, folloAA-ed by a second further back, and a third in front of the dorsal; vertical fins grey ; three round white spots on the posterior part of the anal; ventrals blackish. Total length 105 millim. A single specimen from Lake Nyassa. Collected by Miss M. Woodward ; presented by Miss S. C. McLaughlin. 58. TILAPIA AURATA. (Plate XII. fig. 3.) Chromis auratus, Bouleng. Ann. & Mag. N . H . (6) xix. 1897, p. 155. Tilapia aurata, Bouleng. Tr. Zool. Soc. xv. 1898, p. 4. Teeth small, in 5 or 6 closely-set series in both jaws. Depth of body 3 | in total length, length of head 3j. Snout short, profile curved ; diameter of eye 4 times in length of head, slightly greater than interorbital width ; mouth small, f width of head, extending to betAveen nostril and eye ; 3 series of scales on the cheek ; large scales on the opercle. Gill-rakers very short, 8 on lower part of anterior arch. Dorsal X I X 6; spines subequal in length from the 4th, 3 length of head, 4, longest soft rays. Pectoral |