232 
broad and is radially sulcated. The actinopharynx is long and long- 
itudinally wrinkled, in the sectioned specimens there are 2 sipho* 
noglyphes, especially in the one specimen asymmetrically arranged. 
Anatomical description. The specimens were not well 
preserved, wherefore I cannot give a perfect description of the 
anatomy of this species, 
The ectoderm of the scapus and capitulum is rather thick, the 
former is provided with a rather well developed cuticle, which in 
the apex of the //a/campa-papillae is strongly thickened. In the 
capitulum there are nematocysts 14—18X2in size and often some- 
what curved. The mesogloea of the column is thick, on its outer 
side very folded and contains very numerous ramificated cells. The 
sphincter (textfig. 33) is long and strong and extends rather far 
into the scapus. It does not occupy the whole breadth of the meso¬ 
gloea and approaches more to the ectoderm than to the endoderm, 
except in its undermost part. Its muscle meshes are small and 
rather close. The circular muscles of the column are ordinarily 
developed. The high ectoderm of the tentacles is provided with 
very sparse nematocysts 14—19 x 1,5 —almost 2 and very numer¬ 
ous spirocysts 14Xabout 1 ^—29X3//. The longitudinal muscles 
of the tentacles are ectodermal and rather well developed, weaker 
are the ectodermal radial muscles of the oral disc. The ectoderm 
of the actinopharynx is rather high and contains nematocysts with 
visible basal part to the spiral thread. Their sizes were 13 —14x 
2 — 2,5 /r (possibly these nematocysts belong to the oral disc as it 
was difficult to get a good maceration preparation of the actino¬ 
pharynx). The mesogloea of the actinopharynx is thin in the furrows, 
considerably thickened in the ridges; the ridges of the siphono- 
glyphes are stronger than the rest of them. 
The mesenteries are somewhat irregularly but evidently hex- 
amerously arranged. I have sectioned 2 specimens transversally, 
one of which (a) completely. In the specimen a there were 26 
pairs of mesenteries in the upper part, of which 6 pairs perfect. 
In 5 of the 6 primary exocoels there were 3 pairs of mesenteries 
(of a second and third order) in the sixth 5 pairs, one of which 
very weak. The two pairs of directives were asymmetrically ar¬ 
ranged. On one side, between the directives, only 7 pairs — 
among these one perfect pair — were developed, on the other side 
