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| Endodermal |  |
Voucher for Carlgren and Stephenson 1929; sphincter muscle, endodermal; Lund Museum; source of fig. 3, Carlgren and Stephenson 1929; ex station 9 Australian Antarctic Expedition 1911-1914 © copyright Daphne Fautin |
| Mesogloeal |  |
(D) Longitudinal section of mesogloeal sphincter (azocarmine trichrome staining). Reprinted with permission of Cambridge University Press. |