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lower part of the actinopharynx the ectoderm is thinner. Pigmentation is entirely absent. — 
I he mesogloea is less than i p ; the entoderm (4 p) is the same as in the other parts. 
The actinopharynx, the wall of which is very much folded, descends to the axis, curves out¬ 
wards and follows the axial sheath for a great distance so that hardly any gastral cavity 
remains. The wall is elevated by eventual spines. 
I he mesenteries are normal in course and number. Their mesocdoea is 2 u. their 
o i i 
entoderm 6 p. There are no musclefibres but on the primary transversal mesenteries and on 
one of the pairs of secondary ones mesogloeal lamellae are found, on the averted sides of 
these mesenteries. These lamellae are not found on the other mesenteries. The secondary 
mesenteries descend to a lower level on the side of the bodywall than on the actinopha- 
ryngeal side. 
The mesenterial filaments along the primary transversal mesenteries are convoluted 
and somewhat branched. They are straight along one of the pairs of primary sagittal mesen¬ 
teries, and here they entirely descend along the free border, but the other pair of sagittal 
mesenteries has no filaments. Since there is a greater distance between the transversal mesen¬ 
teries and the filament-bearing sagittal ones than between the transversal ones and the other 
pair, and since in the greater intermesenterial area the secondary mesenteries are better 
developed than in the smaller area, the polyp-section is not bilaterally symmetrical in regard to 
the sagittal axis. — The mesenterial filaments are single-lobed and although they are broader 
than the mesentery, the mesenterial entoderm broadens gradually into the breadth of the ecto¬ 
dermal cap. They have the structure of the actinopharyngeal ectoderm, but there is some 
brown pigment on the limit of ectoderm and entoderm, and sometimes also in the rest of 
ectodermal part. 
Reproductive organs. There are only ova to be found in the primary transversal 
mesenteries. These ova are large with a diameter of 65 p (nucleus: 26 p) so that there are 
only a few ova to be seen in one section. There is no mesogloeal capsule for the whole ovarium 
but there is a very thin sheath around each ovum. The mode of origin is not to be made out. 
Parasites are not found. 
16. Ezoantipathes ulex (E. and S.). 
The preservation is so very bad as to make the ectoderm and the entoderm practically 
invisible. Only the mesogloea can be examined. This mesogloea is a homogeneous layer, 
max. 6 p in the tentacles and in the bodywall, 1 p, in the axial sheath. The rest is not very 
well to be distinguished; the mesenteries are narrow. The oral cone is very low (16 p) and so 
the actinopharynx is also short (50 p). The mouth is wide, since the cone is constricted at its 
base, but widens so much that its wall is almost in contact with the bodywall. 
Reproductive organs. There are oval testes, with a long axis of 120 p and a short 
axis of 80 p.. Each one is surrounded by a thin mesogloeal capsule, less than 1 p thick. They 
are not all of them ripe ; when this is the case, they contain a fan-shaped bundle of spermatozoa. 
The testes are found in the tentacular lumen also; they are large in proportion to the polyp 
