Plate IV. 



Fig. i. Epizoanthtis beerenislandicus. Transverse section through the body-wall 4/ 3 1 . 



— 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. lindahli. (from Baffins Bay) 4/ 3 . 



— 6. glacialis — upper part. -t/ 3 . 



— 7. glacialis lower part. */ 3 . 



' Cf. PI. III. 



