A, cross-section of the mesenteries at actinopharynx, showing diffuse retractor muscles;
B, longitudinal section through distal column, showing mesogleal marginal sphincter and a perforated solid papilla (arrow);
C, cross-section of the mesenteries below actinopharynx, showing parietobasilar muscles (arrow);
D, cross-section through a tentacle showing longitudinal ectodermal muscles;
E, cross-section of the pedal disc showing basilar muscles;
F, and G, longitudinal section through distal column showing a perforated papillae.
Scale bars: A, 1 mm; B, 2 mm; C-E, 0.1 mm; F, G, 1 mm