188 
the marginal tentacles redbrown with Sharp prolongations towards 
the centrum of the disc, in the other specimen with some oltve- 
brown marks in the middle of the oral disc, 
rather distinet in the compartments, corre- 
spondin^ to the inner cycle of the marginal- 
tentacles. Actinopharynx olive-brown, siphon* 
oglyph uncoloured. 
Dimensions of a specimen: length 
9,5 cm, breadth 1 cm; inner marginal tent¬ 
acles about 2 cm long. 
Occurrence: Neira, Banda Isl., low 
water. Danish Expedition to the Kei-Islands. 
]uly 1922. 2 specimens. 
The number of marginal tentacles was 
in the one specimen 29, in the other 42. 
The ectodermal muscle layer of the column 
was strong. In the aboral part of the actin¬ 
opharynx the folded ectoderm was supported 
by short, but thick longitudinal mesogloea- 
balks. The hyposulcus was on both sides 
provided with a very distinet middle streak 
and a single ciliated streak. A transverse 
section of the hyposulcus shows the same 
structure as in ÅrcLchncLctis lobicmcoi (Cari¬ 
gren. Ober Ceriantharia des Mittelmeeres. 
PI. 16. fig. 14). 
In the textfigure 11 I have given a dia¬ 
gram of the arrangement of the older mes- 
enteries. 
The ciliated tract is long as also the 
Fig. 11. Isarachiianthus ban¬ 
danensis. Diagram of the ar¬ 
rangement of tliemesenteries. 
craspedion region in P 2 , M- and m-mesent- 
eries. The boundary between these regions 
is however not distinet, part of the regions 
being of mixed character. In order to con- 
firm the limit between these regions I have sectioned the left pa 
and Ml between the + signs in the textfigure 11. In the under¬ 
most part of the removed pieces only the craspedion region was 
present, in the other part of the pieces the ciliated tract and the 
