1 95 
given in fig. 258. I he system is the same as in the adult polyps; the primary transversal 
mesenteries of polyp / slightly diverge from the normal type, as is described above (fig. 258 at /). 
Parasites, ihere are a few symbiotic Algae in the entoderm of the mesenteries near 
the mesenterial filaments. In some places the lower half of the ectoderm of the tentacles 
contains deeply staining parasites, one of which is figured in PI. Ill, fig. 3. They are almost 
globular, with a granular protoplaSma, enclosed in a larger cavity, on all sides surrounded by 
the ectoderm, and very near the mesogloea. A nucleus is not to be discerned. I consider it 
as a unicellular parasite. 
5. Eucirripathes spiralis (Blainv.) v. P. var. aphanipathoides v. Pesch. 
Tentacles. The ectoderm (30 — 55 p„) contains two types of deeply staining glandcells. 
Together with very numerous, large, homogeneous, not very deeply staining glandcells, there are less 
numerous, very deeply staining glandcells, especially surrounding the nematocyst-batteries. These 
batteries are numerous and not restricted to special ectodermal papillae. The ectoderm contains 
a large number of somewhat elongated nuclei. The nervous layer is well developed, almost in 
contact with the mesogloea. There are hardly any musclefibres. The mesogloea varies from 
20 p, at the tentacular base to a few p. at its top. It is a homogeneous layer, with, in some 
places, very fine fibrillar connections between ectoderm and entoderm; these fibrillae are collected 
in bundles, diverging from the base of one or several epithelial cells. The entoderm (max. 
30 p.) has no muscular layer, while a nervous layer could not be discerned with certainty. 
There are hardly any glandcells. The nuclei are less numerous than in the ectoderm, more 
rounded and less deeply staining. 
Bodywall (PI. Ill, fig. 1). The ectode r m has the same thickness and structure as 
the tentacular ectoderm. The very deeply staining glandcells are absent, together with the 
nematocyst-batteries, but the lighter-staining glandcells are very numerous and form a continuous 
mass over large distances. The mesogloea (13 p.) and the entoderm (28 p.) are the same 
as in the tentacles. 
The oral cone has ectoderm, which is thicker than in the bodywall and exceedingly 
rich in glandcells. There are nematocyst-batteries also. — The polyps are separated by an inter- 
zooidal septum (PI. V, fig. 22), with a depth of 150 p.. The axis-epithelium is lost for 
the greater part. In some places the sheath around the spines is fused with the bodywall. The 
axis-ectoderm is of the same structure as the entoderm of the bodywall. The spines project 
rather far into the polyps; in PI. V, fig. 22 the sheath of such a spine is found at a very 
high level in the actinopharyngeal lumen; the mesogloea is very thin. 
Actinopharynx. (PI. Ill, fig. 1). The ectoderm varies to max. 50 p.. It contains small 
actinopharyngeal glandcells, but in a not very large number. The ectoderm stains very deeply, 
principally through the large number of nuclei. The mesogloea is 5 p. or less, and homo¬ 
geneous in structure. The entoderm (14 p.) is the same as in the bodywall. There is no 
pigmentation in the ectoderm, neither in the upper part of the actinopharynx nor in its lower 
part near the free border. 
