Actiniidae. Pedal disc well developed. Column entirely covered with large simple vesicles very close set. No spherules. Fosse well developed. Sphincter strong, decidedly circumscribed. Tentacles rather short, up to 96. Longitudinal muscles of tentacles and radial muscles of oral disc ectodermal. Two broad siphonoglyphs and two pairs of directives. There are 48 pairs of mesenteries, all seemingly perfect and fertile apart from the directives. Retractors of the stronger mesenteries diffuse, band-like, those of the weaker more restricted. Parietobasilar and basilar muscles strong. Same number of mesenteries proximally and distally. Cnidom: spirocysts, basitrichs, microbasic p-mastigophors.
P. australis Carlgren nov. sp.
Definitions and contained taxa are those of Oscar Carlgren as published in 1949 : Kungl Svenska Vetenskapsakadamiens Handlingar, Series 4, Volume 1, Number 1
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