Fig. 15 in Boring bryozoans: an investigation into the endolithic bryozoan family Penetrantiidae

Fig. 15 Histological semi thin sections of the digestive tract in Penetrantia. a Longitudinal section through an autozooid of P. concharum from Sweden. b Longitudinal section through the proventriculus and caecum of P. concharum from Sweden. c Proventriculus of P. concharum from Sweden. d Proventriculus P. cf. concharum from France. e Longitudinal section through intestine of P. concharum from Sweden. f Cross section through the pharynx of P. concharum from Sweden. g Cross section through a brown body in P. concharum from Sweden. a anus, at atrium, bb brown body, bc body cavity, bw body wall, cae caecum, es esophagus, exc exterior cuticle, int intestine, l lophophore, lb lophophoral base, oo operculum occlusor, op operculum, ph pharynx, pv proventriculus, pvm parieto-vestibular muscle, rm retractor muscle, ts tentacle sheath, v vestibulum, vw vestibular wall