Circumscript Retractor Muscles: A retractor muscle which is strongly concentrated, and there is only one mesogleal lamella (or a few main lamellae close to each other) issuing from the main lamella of the mesentery (Carlgren, 1949; p. 8). In cross-section, appears like narrow, strongly raised band, sharply marked off at the edge from the general surface of the mesentery.

See Also Retractor and Diffuse retractor.

Image of Circumscript Retractor: (species names are linked to the Hexacorallian database)

Species Bunodosoma spherulata CAPTION Fig. 39. *Bunodosoma spherulata*. Transverse section of a portion of the column-wall some distance below the stomodæal region, with a mesentery attached showing the circumscribed retractor muscle, the parieto-basilar muscle, and the simple filament.