EXPLANATION OF PLATE " IX. 



Fig. I. — Anactinia pelagica in a full}' expanded condition viewed 

 from the side, x 5. 



,, 2. — A slightl}- oblique lateral view of an individual partially 

 contracted, x 8. 



,, 3. — The peristome of the same specimen viewed from 

 above, x 8. 



,, 4- — Transverse section through the column on a level with 

 the middle of the stomodseum, x 8; r. = ciliated 

 groove. 



,, 5. — A portion of the same, x 16. 



,, 6. — Transverse section through the body-wall in the same 

 region, highly magnified: cc^. = ectoderm; «./.«= ner- 

 vous layer; /.m. = longitudinal muscles; c.w. = circular 

 muscles ; en. = endoderm. 



