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Show 278 MR. Vf. 8. KENT ON NEW MADREPORES. [Apr. 4, Height of corallum one or two inches ; diameter of the calices y^ inch. Hab. Cape of Good Hope. B.M. I had premised that this species might possibly prove to be identical with Allopora belia (Dana) ; but Count de Pourtales, who is familiar with the type examples of that form, assured me, during his recent visit to England, of its distinctness. In the character of its basal ccenenchyma it closely resembles the genus Amphihelia. Verrill has proposed to make this Allopora belia the type of a new genus, bestowing upon it the name of Cyclopora (" Synopsis of Corals &c. of North Pacific Exploring Expedition," Proc. Essex Institute, July 1866). He considers it to be intermediate between the genera Stylaster and Distichopora in the structure of its septal system, which assumes that "pit-like" character dominant in Distichopora, and common to both Stylaster and Allopora. The remaining characters agreeing entirely with those oi Stylaster, it cannot be naturally separated from that genus. STYLASTER ASPER, n. sp. (Plate XXIV. figs. 2, 2 a.) Corallum arborescent, flabellate ; surface of the ccenenchyma finely echinate throughout, the minor ramuscules often springing from the preceding ones in a regular pinnate order. Calices very minute, increasing by alternate distal gemmation. Columella immersed, stylate, echinate. Septa about twelve in number. Ampullae conspicuous, hemispherical, sometimes echinate, solitary or in clusters, scattered principally over the ccenenchyma of the secondary branches. Height of corallum several inches; diameter of the calices ^3 inch, of the ampullae ~ inch. Colour pale pink. Hab. Unrecorded. " B.M. This species most nearly approaches Stylaster sanguineus, but is distinguished from it by its echinate ccenenchyma, and by the minute size of its calices. In this last character it most closely approaches S. gracilis. STYLASTER EXIMIUS, nobis. S. elegans, Michelotti, Suppl. au M e m . sur les Corall. des Antilles, Mem. della Reale Acad. d. Scienze di Torino, torn, xxiii. p. 162, pl. ix. fig. 4, 1866. Elegans having been already employed as a specific name for a representative of the same genus by A. E. Verrill, in 1863 (Bulletin Mus. Comp. Zool.), eximius is here proposed in substitution to distinguish the form more recently described by Michelotti. ALLOPORA, Ehr. This genus is characterized by Milne-Edwards, in his ' Histoire des Coralliaires,' as differing from Stylaster in its irregular mode of gemmation, and in the complete absence of "ampullae," or vesicular inflations of the ccenenchyma ; at the same time he expresses doubts |