Plate IV. 



Fig. I. Epizoaiitliiis hcercnislaiidicus. Transverse section through the body-wall t/, i. 



— 2. — glaciaUs. Vertical section through the sphincter (from Norw.. N. Atl. Exp.) 7,. 



— 3- — irdmainii — _ _ _ _ (from Lyngen, Nordgaard) Vo- 

 ~ 4- — koreni. Transverse sections through the body-wall ■»/,. 



— 5- — liudahU. — _ _ _ _ (from Baffins Bay) 4/,. 



— 6. — glacialis — _ _ _ _ upper part. 4/,. 



— 7- — glacialis — _ _ _ _ lower part. 4/^. 



I Cf. PI. III. 



