ON ELOACTIS MAZELI. 



75 



Fig. 2. — Transverse section through a mesentery, showing the muscles, also the struc- 

 ture of the wall of the stomatodseum and of the wall of the oesophageal groove : ec. ecto- 

 derm, en. endoderni, m. mesoglcea, m.f. muscle fibres, ces.gr. oesophageal groove or 

 siphonoglyj)lie, p.m. parietal muscle, r.m. retractor muscle, 7i.l. nerve layer, z. zooxanthellae, 

 zc.sf.. wall of stomatodiL'um. 



