216 
comparison with the size of the specimen rather weak. It is quest- 
ionable if the contracted sphincter can cover the tentacles. The 
ectoderm of the tentacles is high. Its nematocysts are rather num- 
erous, 19 — 23 X 1,5 — almost 2 its spirocysts very numerous 
14X1 — 26X1,5. The longitudinal muscles of the tentacles are 
ectodermal with palissade-like, inconsiderably ramificated folds about 
one third the height of the ectoderm. The mesogloea is thick and 
longitudinally folded. The radial muscles of the oral disc are also 
ectodermal and of the same appearance as the longitudinal muscles 
of the tentacles, but the folds are somewhat higher except at the 
insertions of the mesenteries. The ectoderm of the actinopharynx 
contains nematocysts with visible basal part to the spiral thread 
and somewhat acuminated in the distal end. Their size is 26—31 
X 2,5 — almost 3 
The number of mesenteries agrees with that of the tentacles. 
The mesenteries are hexamerously arranged 6 + 6 + 12 + 24 + 48 
= 96 pairs of which 2 pairs of directives. The mesenteries of the 
four first orders are perfect. Also those of the fifth order reach 
almost to the actinopharynx, and some of these mesenteries seem 
to be perfect. Stuckey States that there are only 24 pairs per¬ 
fect, probably he has not dissected the mesenteries at the mouth, 
where many more mesenteries are perfect than further down. The 
longitudinal muscles of the mesenteries form on the stronger 
mesenteries broad, band-like, diffuse pennons, on the weakest 
mesenteries the pennons are somewhat more concentrated. The 
folds are rather high, very numerous, thin and richly ramificated, 
especially on the stronger mesenteries and show a tendency to 
form humps (on sections) in the inner part of the mesenteries. 
The parietobasilar muscles are very strong and are enclosed in 
the mesogloea between the mesogloea-thickenings of the basilar- 
muscles and the main lamella of the mesenteries. The basilar 
muscles are strong. All mesenteries exclusive the directives were 
provided with ovaries. 
Epiactis movtenseni n. sp. 
Di agn osis. Margin distinet with a well developed fossa. 
Cinelides in the region of the margin. Sphincter strong, cireum- 
script, of various appearance. Tentacles of the same number as the 
