ISO 



THE VOYAGE OF H.M.S. CHALLENGER. 



muscular folds of the layer of circular muscles arc very long, and thickly branched only 

 at the base, so that a principal fold soon becomes divided into numerous parallel 

 secondary folds. 



Survey of the Actinia examined. 



Note. — The reader is reminded that this is not a complete list of the Challenger Actinia;. A number of 

 specimens, which did not reach Professor llertwig till after this Memoir was in type, will be described in a 

 Supplementary Report. — J. M. 



