. Bulletin of the Natural History Museum Zoology. 20 GILL AND EDWARDS = total. Caudal vertebrae are defined as those with a haemal spine, and include the terminal urostylar complex (which was counted as a single vertebra). The pattern of insertion of supraneural (predorsal) bones and anterior dorsal-fin pterygiophores within interneural spaces is given as an 'anterior dorsal-fin pterygiophore formula' modified from the 'predorsal formula' of Ahlstrom et al. (1976). Each supraneural is represented by an 'S,' neural spines are repres- ented by slashes, and pterygiophores are represente
. Bulletin of the Natural History Museum Zoology. 20 GILL AND EDWARDS = total. Caudal vertebrae are defined as those with a haemal spine, and include the terminal urostylar complex (which was counted as a single vertebra). The pattern of insertion of supraneural (predorsal) bones and anterior dorsal-fin pterygiophores within interneural spaces is given as an 'anterior dorsal-fin pterygiophore formula' modified from the 'predorsal formula' of Ahlstrom et al. (1976). Each supraneural is represented by an 'S,' neural spines are repres- ented by slashes, and pterygiophores are represented by '3' (indicating a pterygiophore that bears two supernumerary rays and a serially associated ray), '2' (indicating a pterygiophore that bears a supernumerary ray and a serially associated ray) or ' 1' (indicating a pterygiophore that bears only a serially associated ray). An 'anterior anal-fin pterygiophore formula' is also presented, and is similar to the anterior dorsal-fin pterygiophore formula, except that the slashes represent haemal spines. Osteological features were determined from x-radiographs and from cleared-and-stained speci- mens, which were prepared following the methods of Taylor & Van Dyke (1985). Counts and measurements are given as values or value ranges for all type specimens, followed, where different, by values for the holotype in parentheses. Where counts were recorded bilaterally, both counts are presented for the holotype, separated by a slash; the first count given is the left count. Pseudoplesiops immaculatus sp. nov. Bearded Dottyback Figures 1, 2 Pseudoplesiops typus [non Bleeker, 1858]; Bleeker, 1875: 31 (in part, specimen from Amboina). Chilidichthys [sic] sp. 1; Allen & Steene, 1979: 26 (Christmas Island and Cocos Keeling Atoll, Indian Ocean). Pseudoplesiops revellei [non Schultz, 1953]; Kailola, 1987: 244 (Papua New Guinea); Allen & Steene, 1988: 180, fig. 145 (Christ- mas Island, Indian Ocean); Paxton et al., 1989: 521 (list; Gre
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