i 
so that no more than 2 or 3 are usually found in one section; sometimes there is only room 
for a single one. Usually there is one to the right of the axis, and one to the left, in the gastral 
cavity. — Probably they are found only in the primary transversal mesenteries; their manner 
of orioin cannot be made out. 
«— > 
The axis has a wall of 27 p. with a lumen-diameter of 35 p„. The spines are 75 p., so that 
fusions occur between bodywall and axial sheath. The connecting septum is narrow and 16 p. long. 
17. Euantipcithvs myriophylla (Pall.). 
Tentacles. The ectoderm (45 p.) has rather numerous nematocyst-batteries, surrounded 
by a few deeply staining glandcells, which may be entirely absent here and there. There are 
always hyaline glandcells. There is a brown pigment everywhere in the ectoderm, principally 
in the lower half, but also over the entire depth of the ectodermal layer. This pigment is not 
found in the nematocyst-batteries, which are encased in a cup of pigmentation. The pigment is 
very fine, never making the ectodermal structure indistinct, but rather emphasizing it. The 
nervous layer is lying close to the mesogloea. There are no musclefibres or only very slightly 
developed ones with small mesogloeal lamellae. The mesogloea (3 p.) is homogeneous. The 
entoderm (16 p.) has a few small, deeply staining glandcells, but a great number of hyaline 
ones. There are no musclefibres. 
Bodywall. The layers, 33, 2 and 7 p. thick, have the same structure as in the tentacles, 
minus the nematocysts. The pigment is also present. The same holds good for the oral cone, 
the ectoderm of which is somewhat thicker at the top. There is no interzooidal septum. 
Axis. The wall is 26 p. with a lumen-diameter of 26 p.. The spines are 130 p. and they 
lift the bodywall very high so that a section of the bodywall is not a circle but an irregular 
polygon. There are frequent fusions between the axial sheath and the bodywall. — The spines 
are club-shaped without a basal lumen. — The axis-ectoderm is max. 10 p., the mesogloea 
1-— 5 p.. The entoderm is very thick (23 p. !) and contains a great number of hyaline gland¬ 
cells. The connecting septum is triangular with its top towards the bodywall, or everywhere 
of equal breadth. 
Actinopharynx. The ectoderm has only a great number of actinopharyngeal gland¬ 
cells. The pigment, which is found in the tentacles and in the bodywall is entirely absent here. 
The mesogloea is less than 1 p, thick; the entoderm (10 p.) is the same as in other 
parts. — In some polyps there is a distinct lip, especially on the distal side of the oral cone, 
since it is curved distally. 
The mesenteries are normal in number and course; there are no musclefibres or 
mesogloeal lamellae. 
The mesenterial filaments are convoluted, but not to a very extensive degree, along 
the transversal mesenteries, and short and straight along the sagittal ones. In section they are 
kidney-shaped, much broader than the mesentery. Pigmentation is entirely absent. — The 
filaments project far into the tentacular lumen, perhaps while the gastral cavity is occupied by 
parasites. There are no ova or testes. 
