i45 
which consists of numerous small spindles arranged en chevron with the point directed downwards. 
There may be as many as a dozen or fourteen pairs in each row on each side of the polyp-stalk. 
The anthocodia is low and mamma-like and stands at right angles to the supporting 
bundle; but some, more elongated, have their mouths directed upwards. 
The eight points are almost equally developed and their tips usually project. Each point 
consists of about three pairs of spicules. The uppermost pair is stronger than the others, and 
one of the pair is sometimes longer than the other. 
The tentacles are heavily armoured. 
The spicules of the lower cortex consist of the following types: (i) long warty spindles 
with the warts very markedly truncated; (2) short curved spindles, sometimes very distinctly 
kneed, with the warts more developed on one side, the warts often compound and sometimes 
even branched : (3) spindles with one end bifid; (4) modified spindles with one end expanded, 
sometimes indian-club-like, sometimes hockey-club-like, but in all cases very rough; (5) small 
capstans with a slight waist; and arising from these (6) irregular jagged forms, in most cases 
with a central boss. 
4. Stereonephthya imbricans n. sp. (Plate VII, Figs. 9 and 11). 
Stat. 164. i°42 / .5 S., i30°47 / .5 E. 32 M. Sand, small stones and shells. 1 Ex. 
Stat. 310. 8° 30' S., H9°7 / .5 E. 73 M. Sand with few pieces of dead coral. 4 Ex. 
Stat. 315. Anchorage East of Sailus Besar, Paternoster-islands. Up to 36 M. Coral and Litho- 
thamnion. 1 Ex. 
To this new species we refer four colonies, from Station 310, of a pinkish brown colour. 
They are very rigid, the polyps are not in bundles, and the supporting bundle is of the 
ensheathing type, not projecting. 
The largest specimen has a sterile stalk 4 cm. in height and 9 mm. in breadth, heavily 
armoured with large tuberculate spindles, which may attain a length of 4 mm. P'rom the top 
of this sterile stalk about half a dozen short branches arise. These are covered with polyps, 
either singly or in small groups, which arise at short intervals. 
Each polyp has a stalk about 1.2 mm. in length and a strong but not projecting sup¬ 
porting bundle. The supporting bundle is of the ensheathing type, narrowing from a broad 
triangular base to a blunt tip. The inward-bent polyp forms a continuous curve with the 
supporting bundle. 
The anthocodial armature consists of eight points of three or four pairs of very rough, 
short, thick, blunt spindles, two of which may predominate over the others. The number of 
spicules in a point is reduced on the ventral side. At the base of the chevron there are often 
some horizontal or irregularly disposed spindles which merge into the spicules of the polyp stalk. 
I he tentacles are densely armoured. 
The spicules of the sterile stalk are of 2 types: (1) large, broad, very tuberculate 
spindles with papillose or obtuse warts; and (2) narrower forms with conical spines. 
A cream-coloured heavily armoured colony from Station 164, standing 3.5 cm. in height, 
and a colony of the same height and colour from Station 315, agree with the foregoing 
description and should be referred to this species. 
SIBOGA-EXPEDITIE XIII d. 
19 
