218 
on the top of the papillae and surrounded by deeply staining, homogeneous glandcells. The 
batteries are so crowded as to give not much room for the intervening supporting cells, which 
are not numerous. The nervous layer is in contact with the mesogloea. There are no muscle- 
fibres or only very slight longitudinal ones. 
The mesogloea (4 — 5 p.) is rather variable in thickness. It is a homogeneous layer, 
and only in the thinner parts it is fibrillar through the base of ectoderm and entoderm. The 
mesogloea shows circular ridges on the entodertnal side. The entoderm (15 p.) is badly 
preserved ; there are slight circular musclefibres. 
Bodywall. The layers, resp. 5, 1 and 13 p. thick, have the same structure as in the 
tentacles, except that the musclefibres and the batteries are absent. 
The oral cone keeps in thickness the middle between the bodywall and the tentacles. 
It is constricted at its base and at ‘the mouth. The actinopharyngeal ectoderm is continued as 
a lip outside the mouth. — An interzooidal septum is not to be seen. 
Axis. The ectoderm is 6 p., the mesogloea less than 1 p., the entoderm 10 p.. The 
spines lift the bodywall very high, while there are frequent fusions between the axial sheath 
and the bodywall. The spines project far into the gastral cavity between the mesenterial 
filaments. The axis has a wall of 24 p. with a lumen-diameter of 50 p.. The connecting septum 
is short and not very well to be distinguished from the fusions at the top of the spines. 
Actinopharynx. The ectoderm (16 p.) has many actinopharyngeal glandcells but no 
pigmentation. The mesogloea (2 — 3 p.) is fibrillar; the entoderm (13 p.) is the same as 
in the other parts. 
Mesenteries. They are difficult to trace, but they show no divergation in number or 
course. They are short. Musclefibres or mesogloeal lamellae are not to be seen. The mesen¬ 
terial filaments only occur along the primary transversal mesenteries. Ihey are convoluted 
and fill the entire gastral cavity. The ectodermal part is separated from the mesentery by a 
constriction of the entoderm. — There are no ova or testes. 
20. Euantipathes longibrachiecta n. n. 
The polyps are taken from the higher part of the colony. 
Tentacles. On the top ofdts papillae the ectoderm (50 p.) has nematocyst-batteries 
with surrounding glandcells. The nervous layer is clearly separated from the mesogloea. There 
are very slightly developed longitudinal musclefibres. The mesogloea (25 p.) is a homogeneous 
layer. Locally bundles of transversal fibrillae occur, especially at the base of the tentacles. 
There are circular ridges on the entodermal side (as in PI. II, fig. 3). The entoderm (40 p.) 
contains only a few deeply staining glandcells, but many hyaline ones. There is no nervous 
layer and only very slight circular musclefibres. 
Bodywall. The layers, resp. 14, 7 and 14 p, thick, have the same structure as in the 
tentacles, minus the batteries and the musclefibres. There is an interzooidal septum but 
no secondary ones, even no mesogloeal ones. 
The oral cone, with layers of 65, 20 and 26 p,, has the same structure as the tentacles. 
