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Show 152 MR. C. TATE REGAN ON SOUTH-AMERICAN [Mar. 7, 1. A Revision of the Fishes of the South-American Cichlid Genera Crenacara, Batrachops, and Crenicichla. By C. T a t e R e g a n , B .A ., F.Z.S. [Received February 7, 1905. | (Plates X IY . & X V * ) The genera dealt with in the following revision are distinguished from all other Cichlidae by the denticulated posterior margin of the prseoperculum. I have given a list of the specimens in the British Museum Collection on which my descriptions are based, with tlie total length in millimetres of each. C r e n a c a r a . Grenicara Steind. Sitzb. Ak. Wien, lxxi. 1875, p. 99; Eigenm. & Bray, Ann. Ac. N. York, vii. 1894, p. 619; Pellegr. Mem. Soc. Zool. France, xvi. 1903, p. 169 (1904). Dicrossus Steind. t. c. p. 102 ; Eigenm. k Bray, t. c. p. 620; Pellegr. t. c. p. 170. Body ovate or elongate, more or less compressed ; scales large, ctenoid. Two lateral lines ; scales of the lateral line of the same size as those above and below it. Mouth small; jaws equal anteriorly ; maxillary not exposed ; a band of small conical teeth in each jaw ; upper surface of head scaly to between the orbits; cheeks and opercular bones scaly; posterior border of prseoperculum finely denticulated. Gill-rakers short, few. A single dorsal with X IV -X V I I 8-9 rays. Anal with I I I 7-8 rays. Pectoral asymmetrical, with 15 rays; ventrals a little behind the bases of the pectorals. Caudal rounded. Two species from the Amazon and Guiana. 1. C r e n a c ar a p u n c t u l a t a . Accira punctulata (part.) Giinth. Ann. Mae-. Nat. Hist. xii. 1863, p. 441. Grenicara elegans Steind. Sitzb. Ak. Wien, lxxi. 1875, p. 99, pi. i. fig. 1 . Grenicara punctulata Pellegr. Mem. Soc. Zool. France, xvi. 1903, p. 169 (1904). Depth of body 2|-2-| in the length, length of head 3|. Snout a little shorter than eye, the diameter of which is 2f in the length of head and equals the interorbital width. Depth of prceorbital f the diameter of eye. Maxillary not extending to below the eye; jaws equal anteriorly; cheek with 3 or 4 series of scales, none on the prseoperculum; 6 gill-rakers on the lower part of anterior arch. Scales 29 |, 1 between lateral line and * For explanation of tlie Plates, see p. 168. |