influence of the preservation, etc., although the colouring is everywhere the same, while the 
peripherical layer of each bundle would be coloured more deeply through greater density, if 
the fibres had originated through contraction after rupture. — The entodermal side of the 
mesogloea shows circular ridges (PI. II, fig. 3), which are especially high in the lower part of 
the tentacles. Sometimes the bases of these ridges are connected by a fibrillar layer in the 
mesogloea. These ridges repeatedly consist of narrow bands, pressed together, and which towards 
the periphery are branched and continued by the epithelial cells. Towards the deeper mesogloeal 
layers these bands are often continued in the type of bundles of PI. II, fig. 9. The entoderm 
varies from 40—150 p., on the same height in the tentacle. A nervous layer is not to be 
discerned; there are no musclefibres although the limit of entoderm and mesogloea often colours 
very deeply. In some places there are small, deeply staining glandcells on a variable depth in 
the entoderm. 
Bodywall (PI. II, figs. 2 and 4). The layers are very thin, when compared with the 
tentacles, as will be seen by comparing figs. 1 and 2 on PI. II, both of which are enlarged 
to the same degree. The ectoderm (40 p) has the same structure as in the tentacles but 
there are no nematocyst-batteries and the number of deeply staining glandcells is smaller, but 
still large. — The nervous layer is very deeply seated, while musclefibres are absent. — The 
mesogloea (14 p) is homogeneous; the entoderm (18 p) does not contain any glandcells. 
The nuclei which, just as in the tentacles, are more rounded and less deeply staining than in 
the ectoderm are found in the peripheric part of the entoderm or in the middle third part. 
There are a few nuclei only, of the same structure, near the mesogloea (PI. II, fig. 2). The nervous 
layer is well developed. Musclefibres are absent. The entoderm shows a deep-brown pigmentation, 
but only right and left of the place of attachment of the primary transversal mesenteries (PI. II, 
fig. 4). This pigment is arranged in regular longitudinal rows in the epithelial cells, especially 
in the upper part of the entoderm. The same pigment is found in the mesenterial entoderm. 
The oral cone (PI. II, fig. 5) has an ectoderm which varies from 40—105 p in 
thickness in the same section, in connection with the position of the lateral tentacles. The 
thickness is 40 p. where the tentacles touch the oral cone and 105 p. between these places. 
The glandcells are not so numerous as in the tentacles, and nematocyst-batteries are absent. 
I here are many hyaline glandcells in the lower part of the ectoderm. There is a nervous layer 
and a layer of well developed but few longitudinal musclefibres, without mesogloeal lamellae. 
I he mesogloea (20—35 p| is thickest near the mesenteries. The entoderm (13 p) is 
rather badly preserved. — The polyps are loosened from the axis so that only part of the 
axial layers are found. The gastral cavity is a very narrow slit between bodywall and axis- 
entoderm. Above the spines, the sheath of the spines is often grown together with entoderm 
and mesoegloea of the bodywall (PI. V, fig. 26). The axis-ectoderm is thicker at the base 
of the spines than at the top. The axis-ectoderm as well as the entoderm are a low, cubical 
epithelium. The ectodermal nuclei have the structure of the normal entodermal type. 
Actinopharynx (PI. II, fig. 5). The oral cone is very high; the actinopharynx is elongated 
ellipsically in horizontal section. The inner wall is very deeply folded so that the lumen is very much 
restricted, to a breadth of 40 p, together with a longest diameter of 150 p in the upper part of 
