196 
Mesenteries. They are normal in number and structure. The primary transversal mesen¬ 
teries contain ovaria (PI. V, fig. 22). — The mesenterial mesogloea makes no capsule around 
the ovaria, but is entirely dissolved; in PI. V, fig. 22 the mesogloea is clearly visible since 
this section attains the mesentery above the fertile part. 
The mesenterial filaments are found along the primary transversal mesenteries only, 
but they are of no great importance, and they consist in a very short continuation of the 
actinopharyngeal ectoderm along the free mesenterial border. Pigmentation is entirely absent. 
6. Eucirripathes spiralis (Blainv.) v. P. var. striata v. Pesch. 
Tentacles (PI. Ill, fig. 5). The ectoderm (26 p.) contains very deeply staining gland- 
cells, which are only locally crowded and which never form a continuous mass, as in var. 
aphanipathoides. They are found especially in the upper half of the ectoderm, surrounding the 
nematocyst-batteries. A nervous layer is not to be discerned. There is a layer of longitudinal 
musclefibres against the mesogloea. The mesogloea (a few p. — 26 p.) contains a large number 
of fine fibrillae, which do not always connect the ectoderm and the entoderm in a regular 
manner, but they may be rather irregular also, so that the ectodermal or entodermal beginning 
is easily to be distinguished, while the other end seems to finish freely in the mesogloeal mass 
(PI. Ill, fig. 5). The entodermal side of the mesogloea shows circular ridges, especially near 
the tentacular base. The entoderm (26 p.) has a layer of circular musclefibres lying against 
the sides of the mesogloeal ridges (PI. Ill, fig. 5); there is no nervous layer. The entoderm 
contains a few deeply staining granular glandcells at various levels. There is also a brown 
pigment in some places, especially near the surface. 
Bodywall. The ectoderm (13 p.) has the same structure as in the tentacles minus 
the batteries of nematocysts. The glandcells are sometimes of the lighter type as is found in 
the ectoderm of var. aphanipathoides. There are no musclefibres. The mesogloea (5 p.) 
contains the same fibrillae as in the tentacles in all directions. The entoderm (13 p.) has 
only very sparingly distributed glandcells. The superficial layer is often filled with brown pig¬ 
ment, but not regularly everywhere (PL III, fig. 10). The layers of the oral cone are thicker, 
more in concordance with the tentacles (PI. Ill, fig. 10). — There is an interzooidal 
septum, which is not necessarily - at right angles with the colony-axis. 
The AXis-epithelium is lost; the short connecting septum only is partly there. This 
septum is not always found diametrically opposite the polypar mouth. 
Actinopharynx (PI. Ill, fig. 10). The ectoderm (50—60 p.) does not show a nervous 
or a muscular layer. The superficial layer of the epithelium contains numerous small actino¬ 
pharyngeal glandcells. — This ectoderm is continued lip-wise outside the mouth, easily to be 
distinguished from the ectoderm of the bodywall, which contains less deeply staining elements. — 
There is no pigmentation even in the lower part of the actinopharynx. The ectoderm is 
somewhat folded, not corresponding with the places of attachment of the mesenteries; at the sagittal 
ends the ectoderm is less thick, but still of the same structure. The mesogloea (a few p.) 
is homogeneous. The entoderm is 20 p. or less. It contains hardly any glandcells, so that 
