I 
193 
half requires time to develop new acontoids. The specimen repro- 
The species is very nearly related to /. bandanensis. 
7. A.rachnanthus hockii n. sp. 
Di agn osi s: A small species. Marginal and labial tentacles of 
ordmary length; not numerous. Arrangement of the marginal tent- 
ades 1 (dt) I, 1, I I 1 , 1 , I, 1 
0 (dt) I, I, 1 ! I, 1 
I,i 
and of the labial tentacles 
, . ... Directive labial tentacle absent. 
Actmopharynx long. Hyposulcus almost of half the length of the 
actmopharynx with distinet cnidoglandular tract and one ciliated 
streak on each side. 12 mesenteries attached to the broad siphon- 
oglyph. Siphonoglyph not reaching to the oral end of the actin- 
opharynx. Directive mesemeries reaching almost to the aboral part 
of the hyposulcus. Ps somewhat longer than the directives without 
^cni oglandular tract, sterile. P 3 somewhat shorter than the directives 
with short ciliated tract and long cnidoglandular tract. The oldest 
metamesenteries Mi mi Ma ms long, reaching not quite down to 
the aboral end of the animal. No difference between the oldest 
M and m. M and m with long ciliated tract and long craspedion 
region. On each side 3 or 4 of the oldest metamesenteries with 
an acontoid. Metamesenteries B and b short, of about the same 
length as ps and structured as these mesenteries. Acontoids of the 
same structure as in A. oligopodus and sarsii. 
Colour in preserved state: Column grayish, in the upper part 
paler. Tentacles and actinopharynx pale. The outside of each mar¬ 
ginal tentacle at the base with a distinet, brown-red spot. 
Dimensions in contracted state: length 2,5 cm, breadth 0,7 cm. 
^ ecurrence: Fiji Isl. Viti Levu Bau. July 1917. Dr. Bock’s 
-xped. 
The marginal tentacles were 29, the labial tentacles 28 in the 
■ingle specimen. The labial tentacles are possibly arranged in two 
Tcles. The weak ectodermal ridges in the aboral end of the actin- 
’pharynx were not supported by mesogloea offshoots. The outer 
•m of the siphonoglyph contained numerous mucus-cells. The 
lyposulcus has almost, half the length of the actinopharynx, at- 
^lc^ensk. Medd. fra Dansk naturh. Foren. Bd. 75. 13 
