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type species A. bohemicus Barrande, 1887. Aristocystites is characterized by a large, oval to pyriform theca, usually with a distinct basal attachment scar. The mouth is elongated perpendicular to the oro-anal line and bears two weak ambulacral facets at either end. An elongate hydropore and circular gonopore lie between the mouth and the large, angular periproct. The hydropore is nearer the mouth. Plates are covered with irregular diplopores, but are smooth and plate sutures very difficult to distinguish. In table 2, Barrande (1887, p. 65) listed seven other specific names doubtfully attributed to Aristocystites. These included ‘?A. sculptus Barrande, 1887’ and ‘?A. subcylindricus Barrande, 1887, var. de bohemicus’. Barrande (1887, p. 113, pl. 6, figs 28, 29) described and illustrated the unique example of ?A. sculptus and stated its only distinguishing character was the presence of tumid plates. He also described and illustrated (Barrande 1887, p. 114, pl. 6, figs 26, 27, pl. 13, figs 1–21) ‘?A. subcylindricus Barrande, 1887, var. de bohemicus’. The single example illustrated on plate 6 came from the same locality (Chrustenitz) as ?A. sculptus and clearly shows the oral area. The distinguishing characters of ?A. subcylindricus were a rounded base lacking an attachment scar and horseshoe-shaped diplopores. Bather (1919a, p. 72) erected the genus Hippocystis in one of a series of notes (Bather 1918a, b; 1919a–e) commenting on F.R.C. Reed’s monograph describing Ordovician cystoids from Yunnan, China (Reed 1917). Bather (1919a) compared Sinocystis Reed, 1917, with other genera in the family Aristocystitidae and in doing so pointed out that some specimens of Aristocystites Barrande, were characterized by horseshoe-shaped diplopores. He considered these diplopores to differ sufficiently from those of Aristocystites proper to justify characterizing a new genus. Bather (1919a, p. 72) designated A. subcylindricus Barrande as the type species of Hippocystis and specified the original of Barrande’s (1887, pl. 13, figs 1–4) as the ‘holotype’ (Bather 1919a, p. 73). We

Prokopius, a new name for “Hippocystis sculptus” Prokop, 1965, and the status of the genus Hippocystis Bather, 1919 (Echinodermata; Diploporita)