49 
Only on the leftborder of the colony a branch is apparent which is stronger than the other 
ones; but further there are no stems to be distinguished. The ultimate branchlets, a few mm. 
in length, are all more or less directed towards the anterior side of the colony. 
The spines (fig. 23), the surface of which is entirely smooth, have their distal side at right 
angles with the axis or inclined slightly distally, and their proximal side 
inclined. Their length, nearly equal on all sides of the axis, is 100 p..— 
They are arranged in four longitudinal rows, which alternate in a quincunx; 
the mutual distance of the spines is 210 p.. — On the older parts of the 
colony the distribution is just as regular; if possible, here the spines are 
inserted steeper on the axis. — The polyps (fig. 24), badly preserved, 
are white and inserted only on the front of the colony. 1 hey are small 
and cushion-like; often the spines are dimly to be seen through the parts 
of the polyps; the spines perforate the transparent coenenchyma. 1 he 
interpolypar distance is 0.75—1.1 mm. The tentacles are knob-shaped; 
the oral cone, the diameter of which is 180 p., is dome-shaped; the mouth 
is round. The sagittal tentacles are inserted at a slightly lower level than the lateral ones; on 
the thinner terminal branches the polyps are somewhat elongated in a transversal direction. 
The mode of branching is very like Antipathesplana 
F. C., and also like some Antipathellci- species of Brook, but 
none of the latter have the typical curving of the branches 
upwards, after the insertion at right angles. The location of 
the ultimate branches on one side of the colony reminds of 
the colonies of Eiiantipathes myriophylla Pallas, although 
fusions between the branches do not occur in this species. 
Brook’s genus Tylopathes , the ultimate branches of which 
are placed not laterally but on the antero-lateral side, con¬ 
tains some species, especially Tylopathes flabellum Br. 
(= Euantipathes flabellum Brook) which in regard to the 
type of their spines, are nearly related to this species. However, there is no entire concord 
to be found between one of these species and the described specimen. 
Diagnosis: 
Colony : Short stem; branched in a plane; f a n - s h a p e d; network through 
frequent fusions. Branches often inserted at right angles, and afterwards 
curved upwards. — Ultimate branches (a few mm. in length) are inserted on 
the anterior side oft he colony. 
Spines : Smoot h;'distal side at right angles with the axis. Length 1 00— 
200 p. ; 4 longitudinal rows with a mutual distance between the spines of 210 p,. 
Polyps : Tentacles rounded, knobshaped, radiate. Oral cone dome¬ 
shaped with round mouth. Diameter of oral cone 180 p. ; interpolypar 
distance 0.75—1.1 mm. 
Former habitat. Cooper. Salomon Atoll (Chagos) 65 fm. 
Fig. 24. Euantipathes plana (F. C.) n. n. 
a Polyp; b two polyps; a 58.5 Xj b 1 5-75 X- 
Fig. 23. Euantipathes plana 
(F. C.) n. n. Spines on an 
ultimate branch; 5^-5 X- 
SIBOGA-EXPEDITIE XVII. 
7 
