Bull. zool. Norn., vol 39, pt 1 , March 1982 29 REVISED PROPOSALS FOR STABILIZATION OF THE NAMES OF CERTAIN GENERA AND SPECIES OF HOLOTHURIOIDEA. Z.N.(S.)1782. By A.M. Clark {British Museum (Natural History), London) and F.W.E. Rowe {Australian Museum, Sydney, N.S.W.) Following criticisms of our earlier extended proposal (Z.N.(S.)1782 of 1967) by Lemche, 1967, and the fact that stability of some of the included names was achieved by designations of type species, while the likelihood of some others making trouble in the future is acknowledged to be remote, we can now make a much restricted submission. This also omits the problem of Thyonidium and Duasmodactyla, which proved to involve even more complication of interpretation than we once thought. (1) Sporadipus Brandt, 1835, p. 46 2. This included two nominal subgenera, Colpochirota, p. 46, and Acolpos, p. 46, each with a single species, respectively ualanensis Brandt, p. 46 and maculatus Brandt, p. 46. Sporadipus has been considered a synonym of Holothuria since Selenka so referred to it in 1867, p. 339. Only two subsequent uses of Sporadipus are significant, as detailed in our earlier proposal (1967, p. 98) by Semper, 1868, p. 81, and Panning, 1934, p. 65; 1935, p. 85, for groups of species within the genus Holothuria. Our action then in designating 5. ualanensis Brandt as type species of Sporadipus effectively reduced both Sporadipus and Colpochirota to synonyms of Bohadschia Jaeger, 1833, p. 18. 3. Acolpos, with type species by monotypy S. (Acolpos) maculata Brandt, however, remains available. In 1867, p. 339, Selenka, as first taxonomic reviser, regarded maculatus as congeneric with Holothuria (Microthele) maculata Brandt, 1835, p. 46, and so a secondary homonym; accordingly he proposed the replacement name (p. 339) H. hrandtii for Sporadipus maculatus. In 1868 Semper referred both maculatus and brandtii to the synonymy of Holothuria (now Bohadschia) marmorata Jaeger, 1833, p. 18, but Ludwig, 1881 , p. 595, found from a re-examination of Brandt's type material that maculatus is conspecific with H. arenicola Semper, 1868. It is unthinkable that the very well-known name H. arenicola should be replaced by maculatus, around which so much confusion has reigned, or the long-disused brandtii. Simultaneously, we would like to see Acolpos suppressed since it has priority over Thymiosycia Pearson, 1914, p. 171, type species (by original designation) Holothuria impatiens Forskaal, 1775, p. 121 , which is closely related to and certainly consubgeneric with H. arenicola Semper. (Further
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