98 



0-04 to 012 mm. in width. The three-rayed form.s measure about 048 mm. 

 by 024 mm. 



Canal-wall spicules : («) In the stem there are spindles comparatively 

 smooth or bearing few simple spines. They measure from 02 to 2"4 mm. in 

 length and from 0-06 to 0-18 mm. in width. 



{/)) In the stalk there are thick spindles, three-rayed forms, golf-club and 

 globular forms. The smaller are often of a stringy appearance, and they are all 

 covered with blunt protuberances, either rough, blunt spines or branched warts. 

 The spindles vary from 036 to 15 mm. in length and from 003 to 03 mm. in 

 width. 



(^^"olour— The stalk, stem and branches are white ; the twigs pinkish ; the 

 polyp-stalks generally red, but white in certain of the lower parts of the poly- 

 parium ; the polyps and the polyp-spicules are white. 



Locality : N. Andaman Island. 



Dendroncphthya booleyi, Henderson. 



The specimen measures about 59 cm. in height and 38 mm. in greatest 

 breadth. 



The stalk, 27 cm. long, is thick but very thin-walled. From its base 

 it trives oif a number of thin-walled stolons which are often branched, and 



have fragments of shells attached to them. 

 It is bluish-white to semi-transparent in 

 colour and has a peculiar mesh-work ar- 

 rangement on the surface. 



The polyparium is regular in outline, 

 compact in appearance, oval in shape, and 

 greatly flattened in one plane. The branch- 

 ing is not profuse, the stem giving off a 

 large branch on each side in the plane of 

 flattening and then dividing at the tip into 

 two short, thick branches which also lie 

 in the plane of flattening. On the other 

 two sides and on the lower portion of the 

 stem all round there are also small; short 

 branches. The branches divide into short, 

 thick, secondary branches, which divide into blunt lobes on which the polyps 

 are borne. 



The polyps are arranged in groups of four to nineteen, but groups of eight 

 to twelve are most usual, and these again are arranged together to form larger 

 groups in which the polyps all practically reach the same level, thus giving a 



Fig. 50. D. booleyi. 



