ZOANTHARIA 



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

 numerous egg-shaped nematocysts, sometimes large (length 19 24/4, breadth 1417^), sometimes 

 smaller (length ly//, breadth 7 ^) 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 nematocysts have been taken in with the food and that they are the nematocysts of 

 hydroids, which they greatly resemble. 



The species is dioecious. 



The walls of the carcinwcium have the 

 same structure as the body-wall of the polyps. 

 The ectoderm is provided with a thin cuticle 

 and contains nematocysts 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 

 mesogloea resembles the body-wall mesoglcea 

 of the polyps and is very much incrusted. The 

 canal-system (c text-fig, i) 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 ( uter U P> of ^ carcincecium of Epizoanthus incrustatus (fig. i), 



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 

 a network. The mesoglceal pillars between the canal-system. canals; marginal canal. 



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

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

 of the canal-system. 



Remarks. Danielssen (1890, p. 136) states that a specimen of Epizoanthus arcticus 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 (Zoanthus) incrustatus from St. 200. 



Epizoanthus abyssorum Verr. 



PI. 2, fig. 8, PL 3, fig. i, PI. 5, fig. 7. 

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



Verrill Results Expl. Albatross 1885, p. 535, PI. o, fig. 



