By Jean Bouillon, Cinzia Gravili, Francesc Pagès, Josep-Maria Gili, Ferdinando Boero
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The circular canal is usually simple and narrow; occasionally it is not hollow and consists of a solid core of endodermal cells (Laingiomedusae, Proboscidactyla). In the Narcomedusae, the circular canal, when present, follows the exumbrellar lobes and the peronia, forming what is called the peripheral canal system and the peronial canals (see glossary). 45 46 Jean Bouillon, C. Gravili, F. -M. Gili & F. Boero FIG. 27. Morphology of the medusae. A-F, Detail of marginal structures: A, part of the bell margin of Eutima coerulea (Leptomedusae) showing a closed statocyst, marginal warts and lateral cirri; B, portion of the umbrella margin of Cosmetira pilosella (Leptomedusae) showing the marginal flexile cirri; C, bell margin of the narcomedusae Pegantha rubiginosa showing the marginal lappets, the peronia, and the otoporpae; D, marginal open statocyst and marginal cirri of Mitrocomella brownei, Leptomedusae; E, part of the bell margin of Orchistoma pileus (Leptomedusae) showing the tentaculiform structures; F, detail of an open statocyst of Mitrocoma (Leptomedusae).
B = bouche ; CG = cavité gastrique ; CGlSpO = cellule glandulaire endodermique orale spumeuse ; CglSphO = cellule glandulaire endodermique orale sphéruleuse ; CGlSphSt = cellule glandulaire endodermique sphéruleuse stomacale ; Cn = cnidocyste ; CR = canal radiaire ; GM = “gonade “ mâle ; LC = lamelle endodermique ou cathamnale ; M = mésoglée ; PLat = poche manubriale latérale radiaire ; RO = pli endodermique oral ; TO = tentacule oral ; ZC = portion cnidogène du manubrium ; ZI = zone intermediaire du manubrium ; ZO = zone orale glandulaire du manubrium ; ZP = zone proximale digestive du manubrium ; ZSt = portion centrale ou stomacale digestive du manubrium.
Boero FIG. 30. Histology of the medusae, diagrammatic illustration of a histological s e c t i o n t h ro u g h t h e manubrium of a sexual mature male medusa of Cladonema radiatum, Anthomedusae (after Bouillon & Houvenhagel, 1970). B = mouth; CG = gastric cavity; CGlSpO = endodermal spumous oral gland cell; CglSphO = endodermal spherulous oral gland cell; CGlSphSt = endodermal stomacal spherulous gland cell; Cn = cnidocyst; CR = radial canal; GM = male “gonad”; LC = endodermal or cathamnal lamella; M = mesoglea; PLat = radial lateral manubrial pouch; RO = endodermal oral fold; TO = oral tentacle; ZC = cnidogenetic portion of the manubrium; ZI = intermediary zone of the manubrium; ZO = oral glandular zone of the manubrium; ZP = proximal digestive zone of the manubrium; ZSt = central or stomachal digestive portion of the manubrium.