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by deeply staining, granular glandcells. There are also larger glandcells with an alveolar structure. 
This latter type is closely crowded in very large parts of the ectoderm. There are no muscle- 
fibres while a nervous layer is absent. The mesogloea, less than 2 p thick, is a homogeneous 
layer. The entoderm (7—12 p) contains a great number of large, deeply staining glandcells 
with big, transparent vacuoles. They are lying at a very low level in the entoderm, but they 
are so large as to take up the entire depth of the entoderm. 
Bodywall. The ectoderm (7 p) has the same structure as in the tentacles but the 
nematocyst-batteries are very rare or entirely absent. The alveolar glandcells are very numerous. 
The mesogloea (1 p.) is sinuous. The entoderm (7 p.) is the same as in the tentacles. 
The oral cone has the same structure as the bodywall but the ectoderm is somewhat 
less in thickness (max. 10 p„). There is no interzooidal septum to be found. 
The axis is solid! There is no axial lumen. In some places it is entirely concentrically 
stratified, but in other places this stratification is invisible in the centre of the axis, which centre 
is irregularly heterogeneous in structure, while the rest is distinctly stratified. — The spines 
are blunt knobs. 
The actinopharynx has the normal type with a basal widening and a free border, 
which is slightly curved upwards. The ectoderm (26 p.) has many small actinopharyngeal 
glandcells, but also a very large number of deeply staining glandcells of the entodermal type, 
contained in a lower level of the ectoderm. The mesogloea (1 p) and the entoderm (7 p) 
are the same as in the other parts of the polyp. 
Mesenteries. Only the distal part of the primary transversal mesenteries is visible. The 
rest of the mesenteries is not discernible. The entoderm of the transversal mesenteries (7 p) 
increases to 10 p near the mesenterial filaments. There is a very large number of deeply 
staining glandcells in the remaining part of the entoderm. There are no musclefibres and no 
mesogloeal lamellae; the mesogloea is less than 1 p thick. 
The mesenterial filaments are unbranched, or at the utmost once forked, and straight. 
They are found along the primary transversal mesenteries only. They are oval in section, with 
their broad side attached to the mesenteries, which are narrower at this place, while they were 
broader at first. There is no pigmentation. The deeply staining glandcells of the actinopharyngeal 
ectoderm are also entirely absent over large distances of the filaments. In some places the 
larger type of glandcells occurs, which was also present in the actinopharyngeal ectoderm. The 
lack of pigmentation and of nearly all glandcells results in the striking feature that the fila¬ 
ments are hardly stained, while the mesenteries are very deeply stained, just the reverse of 
the normal condition in other species and genera. 
There are no reproductive organs to be found. 
24. Stichopathes solorensis sp. n. (PI. VI, fig. 11). 
Tentacles. The ectoderm (70 p) is somewhat variable in thickness. The numerous 
nematocyst-batteries are to be found not only on the top of the papillae but also in the inter¬ 
vening grooves. They are surrounded by a small number of deeply staining glandcells, which 
