2 3 ZOANTHARIA 



greatest number observed being 7. The polyps are arranged in the same way as in the main form, 

 but they are considerably more slender and narrower in comparison with the length than in the main 

 form. As in the latter they are narrow at the base but expand gradually towards the distal part. 

 The capitular region, which was contracted in most of the specimens, had distinct capitular furrows 

 varying in number between 14 and 19 - - 2 polyps had 14, 4 had 15, 13 had 16, 1 polyp 17 and 

 another 19 furrows — the maximum frequently being thus 16. The preserved specimens had often more 

 or less distinct cross-furrows. The tentacles were much narrower than in the main form. The oesophagus 

 is short, the siphonoglyphe distinct, hyposulcus well-developed, though shorter than the oesophagus. 



Anatomical description. The ectoderm is fairly high, continuous and contains few nema- 

 tocysts or none. The mesoglcea is several times thicker than the ectoderm and like this is richly 

 incrusted with sand-grains, which make the anatomical examination difficult. As the incrustation is 

 not very strong, however, I have been able to make out, that the mesoglcea contains a few, large 

 cell-islets but numerous cells (and small cell-islets). (PI. 5 fig. 5). 



The sphincter is strong. Seen in transverse sections through the sphincter the mesoglceal 

 meshes are however fairly large. 



The ectoderm of the tentacles is of the typical structure with very numerous spirocysts and 

 fairly common thick-walled nematocysts (length 17/1). 



The ectoderm of the oesophagus is high. There is a frequent occurrence of equally broad 

 nematocysts with twisted thread (length 24— 36/i, breadth 10—11/2) and of thick-walled nematocysts 

 (length 22 — 25/./). The mesoglcea is thin, in the lower part it forms longitudinal ridges corresponding 

 to the insertions of the mesenteries. The ectoderm of the siphonoglyphe is as usual thinner than in 

 the oesophagus, the mesoglcea on the other hand is several times thicker than there. In two specimens 

 the number of mesenteries was 32, in a third 30. At least one of the first-mentioned polyps had 

 the normal number of developed mesenteries. The third had 9 macro and 7 micro on the one side and 

 8 macro and 6 micro-mesenteries on the other. The micro-mesenteries are fairly well-developed and 

 from the oesophageal region they reach somewhat into the chambers. The longitudinal muscles are 

 strong, especially on the directive mesenteries. The folds are however large. The parieto-basilar muscles 

 are very weak. Moderate distribution of the longitudinal and parieto-basilar muscles on the body-wall. 



The filaments have the usual structure. The glandular tract contains numerous capsules, some 

 equally broad with greatly twisted thread (length 26 — 34^, breadth ioju), others thick-walled capsules 

 broader at the one end and with distinct base to the spiral thread (length 19 — 22 /i). 



The sexual organs were not developed in the specimens examined by me. 



Epizoanthus danielsseni 11. sp. 



PI. 1 fig. 13, 15 PI. 2 fig. 6 PI. 5 fig. 1. 



Epizoanthus glacialis n. sp. pro parte Danielssen Norwegian N. Atlantic Ex. p. 129 fig. 9. PI. 6. 



Occurrence: 64°2i / N., io°4o'E. Sabulous clay. Bottom temp. — 07 Norwegian North Atl. 

 Ex. Stat. 164 June 29th 1879. 5 S P- Bergens Museum, (sp. a). 



