Abstract
In the Scottish Lower Carboniferous limestones there are known to occur at least sevenspecies of Dicyclic Inadunate crinoids belonging to the family Poteriocrinidae, one of the main characters of which is the possession of five simple unbranched arms. One species is also known from the Carboniferous of the Isle of Man. Two of the Scottish species have been assigned to the genus Ulocrinus, viz. U. globularis de Koninck and U. doliolus Wright. The former species is now referred to U. bockschii (Geinitz), which has priority, and the Scottish specimens as they commonly occur appear to be indistinguishable from it. The cup in these two species is specially characteristic, the shape being for the most part globular and the anal area, while sometimes of normal character, is more commonly occupied by a large RA with anal X and rt surmounting it and comparatively small. The arms are rather long, uniserial, and formed of narrow cuneiform brachials (Plate XIV, Figs. 1–6). (Bather, 1916–17; Wright, 1927, 1936.)
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