Sunday, Sept. 16. 8. looked at setae (long whips) of vibracula & examined base of vibracula which looks just like an avicularium in outline. 9. We got to discussing diaphragm which goes across at base of tentacular sheath. G. could not remember if Bugula had a diaphragm. G. did note that stenostome diaphragm seemed different to cheil. (am I remembering this detail correctly) 10. How many layers are there in peritoneum. G. says this is a real problem. 11. G. says there is epithelial peritoneum & peritoneal tissue lining digestive tract. This far she is willing to go in identifying relationship of peritoneum. 12. The problem of chitinous joints in such spp. as Scyphozellaria. The chitin has a laminati structure acc. to G. 13. Funiculus goes across pore plates (called = rosettes by Bobin) Hence Chetham is suggesting diaphragm be dropped as a structure near 'vestibule'.