53 



The Stiitzl)iind('l is well developed ; it consists of several spicules one of 

 which may be 4(3 mm. long and project 1 mm. beyond the polyp. The tip of 

 a second may also project slightly. Different stages can be well seen in polyps 

 of different sizes. In the younger, the Stiitzbiindel spicules are not very dif- 

 ferent from the others in size but their arrangement at once distinguishes them. 



Cortical spicules : {n) Those of the stem are large spindles, either straight 

 or curved, and one or two forms of spindles which have a thick part in the 

 middle, then are abruptly narrowed and produced into a long, thin, tapering 

 point. All are covered with regulai-ly arranged spines or thorns which are 

 simple in the smaller, but tend to become wart-like in the larger spicules. They 

 vary from 0-36 to 5-0 mm. in length, and from 005 to 027 mm. in breadth. On 

 the smaller the number of spines is relatively less than on the larger. 



(/>) The stalk contains short, thick spindles, thick clubs, globular forms, 

 T-, Y- and L-shaped forms, irregular short spindles, and half-moon shaped 

 forms, four-rayed forms, spindles with a short branch on one side, and balls 

 with two arms going out at one side. All are characterised by the great develop- 

 ment of the large warty protuberances which are on the whole regularly 

 arranged. Spindles measure up to 20 x 0*25 mm., clubs up to 09 x 027 mm., 

 globular forms up to 0"265 mm. The arrangement of the spicules on the stalk 

 presents a fine granular appearance. 



Canal-wall spicules : {/() The stem contains straight or curved spindles 

 which may measure IS mm. in length and 024 mm. in breadth and are covered 

 with warty protuberances, and small, flat, smooth, spindle-shaped to star- 

 shaped forms. 



(/>) The stalk contains very thick spindles, clubs, three-, four- and five-rayed 

 forms, spindles which give off from one end three or four rays, peculiar hunch- 

 backed spindles, and small, flat, smooth stars. All except the last-named are 

 covered with prominent, regularly arranged, multituberculate warts. Spindles 

 measure up to 21 mm. in length by 042 mm. in breadth, and some of the 

 three-rayed forms measure 2"5 mm. in greatest length. In many of the four- 

 rayed type one half is exactly the mirror image of the other half. 



Colour— Stalk, stem and branches whitish-yellow ; upper surface of 

 flattened branches white ; tips of the twigs, polyp-stalks, polyp bodies pale 

 violet ; tentacles white. 



Locality : Andamans. 



Dendronephthya pentagona, Henderson. 



To this species we refer a specimen from the Andamans, which measures 

 about 6 cm. in height and about 5 cm. in greatest breadth. 



The stalk is stiff and parchment-like in texture and measures about 2-5 



