Plate IV. 



Fig. i. Epizoanthus bcercnislandicus. Transverse section through the body-wall 4/, i. 



2. glacialis. Vertical section through the sphincter (from Norw.. N. Atl. Exp.) 2 / 3 . 



3. crdmanni (from Lyngen, Nordgaard) 4/ 



4. koreni. Transverse sections through the body-wall 4/ 3 . 



5. tindahli. (from Baffins Bay) 4/ 3 . 



6. glacialis upper part. 4/ 3 . 



7. glacialis lower part. 4/ 3 . 



i Cf. PI. in. 



