30 



ZOANTHARIA 



minifera. It contains fairly many small cells with outslioots (PI. 5, fig. i). In the specimen from tlie 

 locality c, which was somewhat less incnisted than the rest, there seemed to be a sparse occnrrence 

 of cell-islets of moderate size near the entoderm. Whether, these may also be found in the other 

 colonies I am nnable to say owing to the strong incrnstation. The ectoderm is almost as high as 

 the entoderm. 



The sphincter is very strong and resembles that of E. glacialis. It almost fills up the whole 

 breadth of the mesogloea. In transverse sections we find large muscle fibres separated by fairly thin 

 mesogloea-ridges, which divide up forming smaller meshes. 



The tentacles have the usual structure. The ectoderm is provided with very numerous spirocvsts. 

 It contains besides many small nematocysts of the same kind and size as in the capitular region and 

 typical thick-walled capsules (length 17 — 19 /i). 



The ectoderm of the oesophagus is high and contains numerous thick-walled capsules with 

 fairly distinct basal part to the spiral thread (length 24— 27/<). There is besides a sparse occurrence 

 of large nematocysts as in the capitular region (length 38 — 48 /i, breadth 7^^). The mesoglcea is thin, 

 but thickened in the siphonoglyphe. 



The number of mesenteries is variable. In two of the polyps of b it was 38 and 32 respectively, 

 typically developed in the latter and in the first with two mesenteries more on the one side of the 

 sagittal plane than on the other. One specimen from a had 36 mesenteries and 2 specimens from c 

 had 36 and 30 respectively. The latter was however a small polyp. 



The macro-mesenteries are large with thick mesogloea (all the specimens were however strongly 

 contracted). In the lower part of the oesophagus the micro-mesenteries were fairly weak and only 

 projected very little above the entoderm of the body-wall. The longitudinal musculature is comparatively 

 strong and when seen in transverse section lies in close folds. The parieto-basilar muscles are weak. 

 The longitudinal and the parieto-basilar muscles extend a long way onto the body-wall. 



The filaments have the usual structure. In the glandular tract there is a numerous occurrence 

 of nematocysts with greatly twisted thread (length 34— 48/(, breadth 7;/, sometimes 8/i) and thick-walled 

 capsules with distinct basal part to the spiral thread, broader at the one end than at the other (length 

 22//). Further, I have sometimes observed some very scarce nematocysts of the same kind as in the 

 lower part of the body-wall (length (24) 26— 29/v). 



The polyps are dioecious. 



van loveni PI. 2, fig. 9. 



Together witli the .species E. glacialis and Isozoanthus ii/gvlfi. collected by Sven Loveu in 

 Oxfjord in Finmarken, occurred a small colony with 2 pohps (fig. 9 PI. 2), which had a great outward 

 resemblance to these species and a similar incrustation of sand-grains, among which a number of black. 

 Examination of the nematocysts and the subsequent anatomical investigation showed, however, that 

 they did not belong to these species but stood in better agreement with E. daniclssnii, to which I 

 provisionally refer them, though they are not in absolute agreement with tiiis .species, measurements 

 especially of the large nematocysts, with regard to length, lie somewhat below the values found in 

 E. danielsseni (even among the specimens from locality c which showed the lowest values). The 

 incrustation is also considerably weaker, so that we may possibly have a new species before us, but 



