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Show 1899.] SYRIAN FISHES OF THE FAMILY CICHLID^. 135 the caudal peduncle, the last on the root of the caudal fin ; two round white spots on the anal fin. Total length 73 millim. A single specimen, collected by Dr. Livingstone on the Zambesi Expedition. 53. TILAPIA DESFONTAINESI. (Plate XL fig. 3.) Labrus desfontainii, Lacep. Hist. Poiss. iv. pp. 54 & 160 (1802). Sparus (?) desfontainii, Gervais, Zool. Pal. Gen. p. 208, pi. xiv. fig. 4 (1869). Chromis desfontainii, Sauvage, Bull. Soc. Philom. (7) i. 1877, p. 160 ; Vincig. Ann. Mus. Genova, xx. 1884, p. 429; Rolland, Rev. Scientif. (4) ii. 1894, p. 418, fig. Teeth in 3 series in both jaws, outer moderately large, uni- or bicuspid, inner very minute. Depth of body 2i to 2\ in total length, length of head 2f- to 24. Snout with straight upper profile, \\ to 1| diameter of eye, which is 4 to 4^ times in length of head and equal to or slightly less than the interorbital width; mouth moderate, i to § width of head ; maxillary extending to beloAv anterior border of eye; 4 series of scales on the cheek; large scales on the opercle. Gill-rakers short, tubercle-like, 7 or 8 on lower part of anterior arch. Dorsal X V - X V I 10-11 ; last spine longest, f- to \ length of head, f to f longest soft rays. Pectoral obtusely pointed, -§ to f length of head, not extending to origin of anal. Ventral reaching vent or origin of anal. Anal III-IV 8-10; third spine shorter and stronger than last dorsal. Caudal rounded. Caudal peduncle as long as deep. Scales ctenoid, 30-33 ^ 6 ; lat. 1. ^ j 1 . Brownish or olive ; a more or less distinct dark streak from below the eye to the angle of the mouth; a dark opercular spot; vertical fins with small dark and light spots; ventrals black. Total length 90 millim. Algerian and Tunisian Sahara. This species links Tilapia with Paratilapia. In some specimens, as observed by Sauvage, nearly all the outer teeth are conical and unicuspid, whilst in others all or most of the outer teeth are provided with a lateral cusp situated on the outer side at a considerable distance from the apex. 54. TILAPIA FLAVII-JOSEPHI. Chromis fiavii-josephi, Lortet, Arch. Mus. Lyon, iii. 1883, p. 141, pi. vhi. fig. 2. Teeth as in T. desfontainesi. Depth of body equal to length of head, 2 | in total length. Snout Avith straight upper profile, 1^ to 1^ diameter of eye, which is 4 to 4| times in length of head and equals interorbital Avidth; mouth large, § to f Avidth of head ; maxillary extending to below anterior border of eye; 3 or 4 series of scales on the cheek ; large scales on the opercle. Gill-rakers short, 8 on loAver part of anterior arch. Dorsal X I V - X V 8-9 |