102 
The polyps (figs. 99, 100), which are almost invisible to the naked eye, are placed 
on the distal side of the branches; 
young polyps are interpolated between 
the adult ones. The interpolypar dis¬ 
tance is 1.25 mm. The round oral 
Fig- 99- Parantipathes tenuispina Silb. Polyps on an ultimate branch. 
15-75 X- 
Fig. 100. Parantipathcs tenuispina^ Silb. 
One of the polyps of fig. 99'; -52 X- 
cone, with slanting sides, has a small, round mouth. The tentacles are knob-shaped; the sagittal 
ones are inserted at a lower level than the lateral ones. On the 
stem the tentacles show a radiate arrangement, but the polyps 
are decidedly elongated on the younger branches where the 
propprtion between the transversal and the sagittal axis of the 
polyps is as 4:1. On the wormtube the polyps only sit on the 
outside-, perhaps they are somewhat more crowded than on 
other parts of the colony, but at any rate this difference is not very conspicuous. 
Although the proportion of the axes of the polyps on the older parts of the colony is 
as 1:1, I have kept this species in the genus Parantipathes , since the mode of branching 
and the polyps on the younger branches are so very like the characteristics of Parantipathes , 
but without doubt the polyps are inclined towards the Euantipathes- type, so that this species 
is an intermediate form between both genera. — There are some points in common with 
Parantipathes larix Esper but the secondary branches, the irregular distribution of the primary 
branches, etc. induced me to keep them apart. 
Diagnosis: 
o 
Colony: Cylindrically shaped with obtuse apex. Entirely branched towards 
every side. Branches distributed irregularly, mostly simple, some of them 
branched in the same manner. Rare fusions. Wormtube of the same pattern 
as in Parantipathes colnmnaris. 
Spines : Blunt on the top of the branch: on the other parts acute. Irregu¬ 
larly distributed with fragmentary longitudinal rows (4—6). Mutual distance 
very variable, about 400 y.. Smooth surface. Length: max. 108 a. 
Polyps: Small and inconspicuous. Radiate on the older parts, elongated 
(4: 1) on the branches. Tentacles knob-shaped. Oral cone round with slanting 
sides and small, round mouth. Interpolypar distance 1 — 1.25 mm. 
Former habitat. Silberfeld : Sagami-bay (Japan) 200 M. 
4. Parantipathes larix (Esper) Brook. 
Parantipathes larix (Esper). BROOK, Antipatharia, Chalk Rep., p. 142, pi. XII, fig. 20; pi. XIII. 
fig- 2 ; ph RE, fig. 1. Syn. cf. BROOK; Hickson, The Alcyonaria etc. (Journ. Mar. Biol. 
Ass., vol. VIII, n° 1); Thomson, Note on a large Antipatharian from the Faeroes (Proc. 
R. Phys. Soc. Ed., vol. XVII). 
Stat. 95. 5 ° 43.5 ii9°40 E. Sulu-sea. 522 M. Stony bottom. 1 spec. 
This specimen only is a fragment of a colony, but the characteristic points are easily 
discernible. The colony is 4 cm. long, straight and cylindrical, with a diameter of 1.5 cm. The 
