22 I 
contact with the axial entoderm, so that the gastral cavity is very much narrowed, except next 
to the free border of the actinopharynx, where the mesenterial filaments are found. 
The mesenteries are normal in number and course They are all of them very narrow, 
even the primary transversal mesenteries, since the actinopharynx is at so short a distance from 
the bodywall. 1 he entoderm is 6 p thick, the mesogloea i p; the mesogloea broadens, where 
the primary transversal mesenteries are fixed to the actinopharynx. Sporadical oval cells may 
be found in this broader part. At their extremities the primary transversal mesenteries are free 
from mesenterial filaments, but the mesogloea is broadened at the free border, club-shaped in 
section, but without the oval cells, which are abundant in these broadened borders in some 
Eucirripathes -species (cf. PI. I, fig. io). — There is no mesenterial musclesystem, but the 
primary transversal mesenteries have some unilateral mesogloeal lamellae without musclefibres; 
there is not much room on the narrow mesenteries for these lamellae. 
The mesenterial filaments are kidney-shaped with a breadth of 6o p. The mesentery 
broadens perceptibly, but the ectodermal lobe is much broader. The ectoderm has the structure 
of the actinopharyngeal ectoderm, but there are also many hyaline glandcells. — There are 
also nematocysts in these filaments, but not together in batteries. — The filaments are branched 
and they are principally lying in the gastral cavity and in the base of the tentacles on one side 
of the actinopharynx. 
Reproductive organs are absent. 
22. Aphanipathes indistinct a sp. n. 
Tentacles. The ectoderm (33 p.) has nematocyst-batteries, with surrounding deeply 
staining glandcells, on the top of the papillae, which are constricted at their base. The nervous 
layer is not very strongly developed and is found near the mesogloea. There are no muscle- 
fibres. I he mesogloea (2-—4 p.) is a homogeneous layer. The entoderm (15 p) has no 
deeply staining glandcells and no musclefibres. 
Bodywall. The ectoderm, varying from 7 — 15 p. in thickness, is thickest in those 
places, where the deeply staining glandcells are very much crowded locally. In other parts these 
cells are entirely absent. There are also some nematocyst-batteries, but not many. The meso¬ 
gloea (6 p) is usually a homogeneous layer, but some oval cells may be found very rarely 
in the thicker parts. The entoderm (5 p) is the same as in the tentacles. 
The oral cone is high, broad and cylindrical with a conical apex. The ectoderm is 
12 p in the vicinity of the mouth, but elsewhere it is thinner. There is no interzooidal 
septum. 
The axis has a wall of 7 p with a lumen-diameter of 45 p. The spines are 40 p; they 
lift the bodywall, but not to a high degree; they do not project very far into the polyps. The 
sheath of the spines may be fused with the bodywall. The spines are club-shaped with a basal 
constriction. The axis- e c t o d e r m is 5 — 7 p, the mesogloea less than 1 p, the entoderm 
5 p. dhe intima of the axis has a cellular structure. The connecting septum is short and broad; 
sometimes it is more like a very extensive fusion of the bodywall and the axial layers. — 
