three rows of about 20 pinnules in each row on both sides. The siphonozooids are not very 
numerous, showing- simply 8 slight indentations round the margin. Young autozooid-buds at all 
stages are also present. The spicules are numerous. 
Previously recorded from Indian Ocean (near Zanzibar). 
10. Xenia membranacea Schenk. 
For description see: SCHENK, Abh. Senckenb. naturf. Ges. Frankfurt, XXIII. 1896, p. 60, 1 fig. 
Stat. 34. Labuan Pandan, Lombok. Coral reef. 1 Ex. 
Stat. 47. Bay of Bima. Shore. 1 Ex. 
Stat. 60. Haingsisi. Reef. 1 Ex. 
Stat. 91. Muaras. Reef. 2 Ex. 
Stat. 142. Laiwui, Obi Major. Reef. 1 Ex. 
Stat. . Unrecorded. 1 Ex. 
A soft flattened colony from Station 60, Haingsisi, has a membranous base (3 mm. in 
diameter) spreading over a mass of Polyzoa and broken shell. From this arises the short 
(6 mm. high), unbranched stem which bears very numerous densely crowded polyps. These 
attain a length of up to 1 cm. The tentacles bear four rows of pointed pinnules with up to 
24 in each row. The mid-line between the pinnules is bare save near the tip. Spicules are 
nunyerous, but the whole texture is very soft. 
The colour is a rusty brown with cream-coloured tentacles. 
A muddy cream-coloured colony from Station 47, Bay of Bima, shows the same low 
flattened type of growth, though in this case the low common base with a membranous expansion 
on one side is divided almost immediately into four short polyp-bearing branches, .the maximum 
length of which is 11 mm. The diameters of the whole flattened colony are 6.1 and 4.7 cm. 
The tentacles are nearly all curved inwards, in a state of contraction, and these often show the 
pinnules contracted into five rows on each side. In normally expanded ones, however, the usual 
four rows are seen with about 20 in each row. 
Another very similar flat colony from an unknown locality has the low membranous base 
divided into several short polyp-bearing branches, densely covered with polyps whose tentacles 
bear four rows of pinnules on each side, in rather bad preservation. The main diameters of the 
whole colony are 5.5 X 4-8 cm. 
Two small colonies from Muaras Reef are completely dried up, but show a membranous 
base with the short stout stem covered thickly with polyps. These show four rows of pinnules 
on each side of the tentacle, about 17 in each row as far as can be seen in the dried state. 
The larger of the two has a maximum diameter of 19 mm.; its membranous base is spread 
over a piece of Madrepore coral. 
A colony from Station 34 with a maximum diameter of 3.4 cm. shows a very thin mem¬ 
branous base slightly thickened at both ends, where the polyps are more thickly clustered. 
A very badly preserved colony from Station 142 with a thin membranous base spreading 
over coral is probably referable to this species. 
Previously recorded from Ternate, New Britain, Zanzibar. 
