ZOANTHARIA 



13 



&»**** 



In the mesenteries of a few specimens taken at St. 129 by the Ingolf-Expedition I found 

 numerous egg-shaped nematoeysts, sometimes large (length 19-24/*, breadth 14—17^), sometimes 

 smaller (length 17 p, breadth 7 p) and also some intermediate sizes. As these only occurred, however, 

 in a few colonies and were wanting in others from the same locality, the doubt arose whether these 

 capsules were of normal occurrence. Sections showed also, that the capsules did not lie in the 

 cnido-glandular tract itself but in the ectoderm immediately within this. It is therefore most probable, 

 that these nematoeysts have been taken in with the food and that they are the nematoeysts of 

 hydroids, which they greatly resemble. 



The species is dioecious. 



The walls of the carcincecium have the 

 same structure as the body-wallj of the polyps. 

 The ectoderm is provided with a thin cuticle 

 and contains nematoeysts of the same kind as 

 in the body-wall, which are especially num- 

 erous on the outer side of the carcincecium. 

 The ectoderm seems to be somewhat thinner 

 on the inner than on the outer side and is by 

 comparison with the mesoglcea very thin. The 

 mesoglcea resembles the body-wall mesoglcea 

 of the polyps and is very much incrusted. The 

 canal-system (c text-fig. 1) of the entoderm is 3 

 greatly developed and lies almost halfway be- 

 tween the outer and inner margins of the car- Text -figure 1-3 Transverse section through the free margin 

 cincecium. The canals are large and broad and < outer H P) of Uie carcincecium of Epizoanthus incrustatus (fig. 1), 



E. abyssorum (fig. 2) and E. paguriphilus (fig. 3. The mesoglcea 



fuse together to irregular lacunae, which form and partly also the ectoderm are seen but not the epithelium in the 



, rr,, , , .,, , .•, canal-system, c canals; cc marginal canal, 



a network. I he mesogloeal pillars between the 



meshes are rather weak, though not so indistinct as in E. abyssorum-. Along the upper margin of 



the carcincecium runs a canal (cc) as in K. paguriphilus. The canal is somewhat broader than the rest 



of the canal-system. 



Remarks. Danielssen (1890, p. 136) states that a specimen of Epizoanthus arctic us was 



obtained at St. 252 on the Norwegian North Atlantic Expedition. From Bergen Museum I have 



received a colony under this name and from the above-mentioned station. The colony consisted 



however of E. incrustatus. This is probably due not to an erroneous determination of Danielssen, 



but more likely to a confusion of localities, for he mentions at the same time that he obtained 



specimens of (Zoanthtis) incrustatus from St. 200. 





Epizoanthus abyssorum Verr. 



PI. 2, fig. 8, PI. 3, fig. 1, PI. 5. fig. 7. 

 Epizoanthus abyssorum n. sp. Verrill p. Amerie. Journ. Sc. 29 1885, p. 151. 



Verr ill Results Expl. Albatross 1885, p. 535, PI. o, fig. 27 b. 



