234 
The colonies of var. asperispina from Saleyer have an anatomical structure, which is 
rather like that of Eucirripathes nana v. P. (cf. PI. I). I he nervous layer ol the tentacular 
ectoderm does not lie at so deep a level. The mesogloea is so thin that there is hardly any 
homoo-eneous laver between the bases of ectoderm and entoderm. 4 he ectoderm of the entire 
c"> + 
bodywall, and not only of the oral cone, is very rich in deeply staining glandcells, and it 
contains fine musclefibres, the direction of which is uncertain. — The axis-entoderm is of the 
same thickness as in the bodywall (60 a!). The actinopharynx does not stain so deeply as the 
bodywall, since its structure is the same as in PI. I, fig. 19. The actinopharyngeal ectoderm 
forms a lip; there may be brown pigment in its lower part. The mesenteries miss mesogloeal 
lamellae or musclefibres. The mesenterial filaments occur along all the mesenteries, even along 
the secondary ones. They are slightly pigmentated, but the pigment may be entirely absent also. 
The unicellular parasite of the preceding colonies is also present, encased in the entoderm of 
the bodywall. The colony-top gives the same sections as in the described specimen; the place, 
where the first polyp originates, has an ectoderm very rich in deeply staining glandular elements, 
while the surrounding ectoderm is decidedly less rich in these cells. I he polyps are small in 
this top-part, especially their tentacles; their oral cone is of the same height as in the adult 
polyps. The actinopharynx is only a very narrow slit. 1 he young spines are club-shaped and 
the axis-ectoderm is very much thicker at their base; their mode of origin is schematically 
given in PI. VI, fig. 2. The axis-wall makes a fold, cylindrical in shape; this first layer is 
everywhere of equal thickness. This is also the case with the second layer, which is at the 
base of the spine not in contact with the first layer. I he third layer is very thin in the basal 
part of the spine but very thick at its top, so that this layer gives the young spine its club- 
shaped appearance. In their further growth the spines gradually get a more normal shape. 
The first fold of the axis-wall remains open at first so that there is a lumen, in connection with 
the axial lumen and often filled with the intima of the axis. I he axis-wall is 5— 9 p. thick with 
a lumen-diameter of 250 p.. 
The polyps of station 260 have pigment in the actinopharynx, but only in its lower part; 
the mesenterial filaments contain pigment to a very large quantity; besides there is pigment 
to be found in the entoderm of the bodywall, right and left of the transversal mesenteries, but 
not in the place of attachment itself; the entoderm of the tentacles may contain pigment, but 
especially at the surface and less in the deeper part of the epithelium. The bodywall has a 
few deeply staining glandcells or none at all, except in the oral cone, where they are very 
much crowded. The mesenteries have unilateral mesogloeal lamellae for musclefibres, but none 
of the several series gives a clear view of the musclesystem. — The mesenterial filaments 
are to be found along the primary transversal mesenteries only. 4 he testes have a pear-shaped 
capsule, the stalk of which is in connection with the mesenterial mesogloea. I his stalk has 
no lumen, so that I saw no persistent opening as in Stichopathes sacctila. I heir mode of origin 
however probably is through invagination of the mesogloea. All the bundles of tails are directed 
towards the mesogloea of the mesentery. — There are some symbiotic Algae in the actino¬ 
pharyngeal ectoderm. 
The polyps of station 7 have no musclefibres in their tentacular ectoderm. Ihe bodywall- 
