316 PERCY SLADEN TRUST EXPEDITION. 
19. Antipathes sealarki, sp. n. (Figs. 18, 13 a, 13 d.) 
Several pieces of a colony 25 em. high. The main stems divide irregularly into 
branches, which themselves divide into alternating subsidiary branchlets of a length 
varying from 0-5-3 em. Both branches and branchlets are roughly in one plane. 
From the branchlets arise pinnules, usually though not always in pairs, which grow 
pointing a little upwards in a plane at right angles to that of the branches (fig. 13 0). 
Fig. 13 a. 
Fig. 138. 
The polyps are small, 0°5 mm. in diameter, circular on the main parts and rather 
elongated on the ends of the pinnules. The lateral arms are set lower and are rather 
longer than the others. 
In position they are borne on one surface of the colony treated as a whole, ¢. e. on that 
side on which the pinnules arise. Further they are confined to the surfaces of the 
pinnules which face each other (fig. 13 b) and to the sides of the branchlets and branches 
which face in the same direction. 
The spines are arranged in steep, regular, sinistrorse spirals. On the larger stems 
they are, comparatively speaking, long and thin, very slightly roughened, and point 
upwards. The average length is 0:2 mm., with the same distance between the spirals. 
On the pinnules they are shorter, stouter, and more crowded together. The colour of 
the colony is brown. 
Locality. Providence, D 4, 50-78 fathoms. 
