FORSTER COOPER.—ANTIPATHARIA. 317 
20. Antipathes plana, sp.n. (Figs. 14, 144.) 
A small colony of this species was obtained attached to a piece of nullipore. It is 
6 cm. high and 11 cm. broad. There is a main stem 4 cm. long, broken off and capped 
by a Serpula-tube. From this arise in one plane five alternating branches, three on one 
side and two on the other, the lower ones being the longest. All curve upwards and 
give off subsidiary branches, which arise for the most part from the lower side; these 
again branch somewhat irregularly into pinnules, which show a considerable amount of 
fusion among themselves. 
The resulting colony grows in one plane and is of the “ flabellate ” type. 
The polyps are perfectly circular with short and stout arms, the two transverse arms 
being a little below the level of the others. The mouth is likewise circular and is 
placed on a prominent oral cone. The size varies from 0°75 to 0°5 mm. in diameter, 
and there is a space of 0°5 mm. between each polyp and the next. They are regularly 
placed on one side of the axis, all looking at right angles to the long and broad planes 
of the colony. 
The colour both of axis and polyps is (in spirit) a rich brown. 
Fig. 14. Fig. 14a, 
The spines (fig. 14) are small, measuring 0:1 to 0°2 mm., triangular and sharp- 
pointed, placed at right angles to the stem or sometimes pointing slightly upwards, and 
arranged in eight steep spirals. 
Locality. Salomon Atoll, Chagos, 75 fathoms. 
21. Antipathes (Antipathella) ceylonensis, Thomson & Simpson. (Figs. 15, 
15 a.) 
Many of these small and delicate colonies were obtained. In point of numbers this 
species was the most abundant of any in those localities in which it was obtained, it 
being no uncommon thing for a single haul of the dredge to bring up 30-40 colonies. 
The largest specimen measures 15 cm. high and 10 em. across. 
The figures show a young (15 @) and a mature colony (15); in the former it can be 
seen that the branching takes place in one plane. 
This species is closely allied to A. chota, the commonest species in the Maldive 
