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72 (46). Ventral to ventro-lateral surfaces of gill covers (opercula) a. unpigmented (FIgS. 44, 72) .......... 73 b. pigmented (Fig. 73) ..... C. platyrhynchus 73 (72). Ventral surface of heart region a. unpigmented (Fig. 45) ..... C. discobolus b. pigmented (Figs. 44, 72) . . . . . . . . . . . . 74 74 (73). Lateral surface of head posterior to eyes a. unpigmented (Fig. 44) ..... C. discobolus b. pigmented (at least 1 melanophore; Fig. 72) ........................... 75 75 (74). Lateral surface of body above horizon- tal myosepta (lateral midline) and below dorso-lateral surface (exclu- sive of pigment associated with horizontal myosepta, air bladder, or visceral peritoneum) a. unpigmented (Fig. 72) ............. 99 b. pigmented (at least 1 melanophore; Fig. 44) ................... C. discobolus 76 (45). Dorsal surface lateral to midline from shortly behind head to about 2/3 distance to last myomeres a. with distinct continuous or nearly continuous lines of melanophores along (parallel to) each side of dorsal midline (Fig. 30) .............. C. commersoni b. with distinctly shorter or discontinuous lines of melanophores along one or both sides of dorsal midline (Fig. 43) ...... 77 c. without distinct lines of melanophores along either side of dorsal midline (Fig. 44) ........................... 78 77 (76). Melanophores in lines lateral (and parallel) to dorsal midline between head and 2/3 distance to last myomeres a. mostly in single file (Fig. 43) ........ 78 b. mostly in obliquely oriented pairs or groups resulting in a "herring bone" or "tractor tread" pattern (Fig. 30) . . . . . . . . . . . . . . . . . . C. commersoni 78 (76,77). Dorsal midline from shortly behind head to near last myomeres a. with ~ melanophores in a distinct con- tinuous or nearly continuous line, one or more shorter segments, or a distinctly discontinuous line (Figs. 30, 45) ...... 89 b. with s24 melanophores in one or more short lines, a discontinuous, well-spaced line or (rarely) no distinct line of melanophores (Fig. 16) ... C. commersoni 79 (26). Dorsal surface lateral to midline from shortly behind head to about 2/3 distance to last myomeres a. with distinct lines of melanophores along one or both sides of dorsal midline (Fig. 30) ........................... 81 b. without distinct lines of melanophores along either side of dorsal midline (Fig. 44) .......................... 82 80 (46). Dorsal surface lateral to midline from shortly behind head to about 2/3 distance to last myomeres a. with distinct continuous or nearly con. tinuous lines of melanophores along (parallel to) each side of dorsal midline (Fig. 30) ....................... 81 b. with distinctly shorter or discontinuous lines of melanophores along one or both sides of dorsal midline (Fig. 43) ...... 83 c. without distinct lines of melanophores along either side of dorsal midline (Fig. 44) ..........................84 81 (79,80). Melanophores in lines lateral (and parallel) to dorsal midline between head and 2/3 distance to last myomeres a. mostly in single me (Fig. 43) ........ 82 b. mostly in obliquely oriented pairs or groups resulting in a "herring bone" or "tractor tread" pattern (Fig. 30) . . . . . . . . . . . . . . . . . C. commersoni 82 (79,81). Dorsal midline from shortly behind head to near last myomeres a. with ~ melanophores in a distinct con. tinuous or nearly continuous line, one or more shorter segments or a distinctly discontinuous line (Figs. 30, 45) ...... 90 b. with s24 melanophores in one or more short lines, a discontinuous, well-spaced line or ( rarely) no distinct line of melanophores (Fig. 16) ... C. commersoni 83 (80). Melanophores in lines lateral (and parallel) to dorsal midline between head and 2/3 distance to last myomeres a. mostly in single me (Fig. 43) ........ 84 b. mostly in obliquely oriented pairs or groups resulting in a "herring bone" or "tractor tread" pattern (Fig. 30) . . . . . . . . . . . . . . . . . C. commersoni 84 (80,83). Dorsal midline from shortly behind head to near last myomeres a. with ~ melanophores in a distinct con- tinuous or nearly continuous line, one or more shorter segments or a distinctly discontinuous line (Figs. 30, 45) ...... 85 b. with s24 melanophores in one or more short lines, a discontinuous, well-spaced line or ( rarely) no distinct line of melanophores (Fig. 16) ... C. commersoni 85 (84). Ventral to ventro-Iateral surfaces of gill covers (opercula) a. unpigmented (Figs. 44, 72) .. . . . . . . . . 86 b. pigmented (Fig. 16) ............... 89 86 (85). Ventral surface of heart region 52