90 



smooth or may bear many rough tubercles. They vary from 0o9 to 3 "5 mm. 

 in length. They are arranged irregularly on the stem and principal branches, 

 they assume a more regularly transverse arrangement in the smaller branches 

 and are nearly longitudinal in the twigs and polyp-stalks. 



(b) In the stalk there are spindles, clubs, three-rayed and forked forms 

 with one long ray, short rods with one whorl at one end, irregular globular and 

 star-shaped forms, and spindles with an apparent foliar expansion. They are 

 all covered with numerous prominent rough warts which are more or less 

 regularly arranged and may be much branched. In some of the smaller the 

 spines are simpler and less numerous. The spindles measure up to 1"1 mm. 

 in length and 018 mm. in width. The clubs average 0"55 mm. in length, the 

 three-rayed forms about 0'9 mm. and the rods with one whorl at an end about 

 015 mm. 



Canal-wall spicules : (a) In the stem there are short, thick spindles of 

 about 0"48 mm. in length and 0'09 mm. in breadth, with a few simple spines 

 on the surface. In addition there are small, flat, smooth .spindle-shaped to star- 

 shaped forms. 



(h) In the stalk there are spindles similar to those of the stem canal walls, but 

 larger and thicker, and in addition, clubs, spindles with large projections on 

 the convex side, a few three- and four-rayed forms, and also a few of comet 

 shape. They are covered by numerous protuberances, which vary in shape from 

 blunt spines to rough warts, and are somewhat regularly arranged. The spindles 

 have an average length of 108 mm. and may reach a breadth of 0"21 mm. 

 The clubs average 0"6 mm. in length and 0"18 mm. in breadth, the three- rayed 

 forms about 0"66 mm. in length, the spindles with projections about 0"55 mm. 

 in length and 0'12 mm. in breadth. There are also numerous small, flattened, 

 globular forms with one large spine. 



Colour — The lower part of the stalk is pinkish-white, the upper part of the 

 stalk and the lower part of the stem white ; the upper part of the stem pinkish- 

 white ; the branches and twigs red ; the polyps yellowish-white, and on the 

 lower branches they may be white to pinkish-white. 



Locality : Forrest Strait, Mergui Archipelago. 



This species and the preceding one approximate very closely to one 

 another, and also to the rlgldu group of the Dimrimtw. 



Dendronephthya brachycaulos, Henderson. 



This species is based on a specimen which measures 5 '2 cm. in height and 

 3 '3 cm. in greatest breadth. 



The stalk is long, measuring 3"5 cm., it is flabby and greatly collapsed 

 at its lower end, but spreads out into a thick, fairly rigid portion at its upper 



