ZOANTHARIA 



Section III. 



Description of the species. 



Family Macrocneminae H add on &; V S hackle ton 1891. 

 Genus Epizoaiitlius. Gray 1867. 



Macronemic Zoantharia with a single mesoglceal sphincter muscle. The body wall is incrusted. 

 The ectoderm is usually continuous but may be discontinuous; cell-islets and lacunae often in the 

 mesoglcea. Dioecious polyps connected by ceenenchyme, which may be band-like, incrusting or greatly 

 reduced, as in the free forms. 



As H add on and Shackleton have given a good diagnosis of the genus, I have used it 

 in the main here. Of the n Epizoanthus species described here 4 are new: lindahli, danielsseni, 

 beercnislandicus and koraii. E. incrustalus and pagurupliilus have previously been described in detail by 

 Had don and S hackle ton (1891) but their description needs supplementing on several points. 

 Regarding E. norvegicus these authors also give some anatomical information and show that Mardcel 

 erdmanni Dan. is an Epizoanthus-species. The other species are described entirely from outer appearance 

 or the anatomical description is so bad, that it cannot be used for a characterization of the species. 



Four of the species E. incrustalus. paguripliilus, lindahli and koreni have been dredged by the 

 Ingolf-Expedition. 



Synopsis of the Epizoa ntli «j-species described here 



A. Species with carcincecium 



a. Without ventral polyp. Ectoderm of the body wall continuous. 



b. The capitular region of the polyps in the contracted state truncate, disc-like, number of 



mesenteries 32 — 42 incrustatus. 



bb. The capitular region of the polyps in the contracted state not truncate, not disc-like, 



number of mesenteries about 46 abyssoriun. 



aa. With ventral polyp. The ectoderm of the body wall discontinuous, except in the capitular 

 region ; number of mesenteries 64 — 80 paguriphilus. 



B. Species without carcincecium 



a. The ectoderm of the body wall in the polyp discontinuous norvegicus. 



aa. The ectoderm of the body wall in the polyp continuous, 

 b. Single unattached polyps or free colonies. 



The Ingolf-Expedition. V. 4. 2 



