p.p where embryonic cell is located in zoecium pose plates development precedes. calcif. + uninvolved solution of enticle (see Silent & Banta) & p. plates dev. where funiculus attaches to wall. Peritoneum Incheilostomes Funiculus is dorsal; peritoneum is P+F are both mesodermals & are exact the same. In cyclostomes funiculus is centrally placed Funiculus has all kinds of specialised cells - eg. glycogen (diffused) glyc in liquid form. & Funiculast alveols release secretions around wh. cells will aggregate & involved in bro. longitudinal double wall.