V. 



117 



I'Dws there are four to Hve jjairs, none of which project. The spicules are 

 flattened curved spindles, and average 0-24: mm. in length, while the projecting 

 spicules average about 0-25 mm. in length. On the back of the tentacles there 

 are two rows of small, flat spicules. 



The Stutzblindel is well developed, and consists of a number of large spicules, 

 one of which may reach a length of 3-2 mm. and project for a distance of 26 nnn. 



Cortical spicules : (a) In the stem there are spindles either curved or 

 straight, from 128 to 2-4 mm. long, from 008 to 0-16 mm. broad, and with few 

 simple spines regularly arranged. 



(/>) In the stalk the spicules are spindles curved or straight, rods, three- 

 and four-rayed forms, and a number of irregular shapes. All are thickly covered 

 with large, rough, branched spines. The small spindles have an average 

 length of 0-25 mm. and breadth of 0048 mm., while the large average la mm. 

 in length and 01<3 mm. in breadth. 



Canal-wall spicules : (a) In the stem there are a very few spindles similar 

 to those of the stem cortex, and a very few small, flat, smooth forms, striated 

 and with toothed edges. 



(/)) In the stalk there are a few spindles similar to the preceding, and a 

 number of small irregular stars. 



Colour — Stalk, stem and branches greyish-white ; polyps reddish-brown. 



Locality: Arakan Coast, 13 fathoms. 



This species may also be classified with the Diraricatce, especially when 

 the arrangement of the polyps on the lower branches is considered. 



Dendronephthya ambigua, Henderson. 



A complete specimen, greatly flattened in one plane, measuring 5-;> cm. in 

 height and about 6 cm. in greatest breadth. Most of the polyps have been 

 rubbed off. 



The short stalk is about 2 cm. in length, greatly shrivelled and wrinkled, 

 stringy in appearance, has traces of a few stolons at the base, which is slightly 

 torn, and has its upper portion hidden by reflexed flattened branches. 



The polyparium is loose and open, greatly flattened in one plane, and oval 

 in outline with the long axis of the oval at right angles to the stalk. It con- 

 sists of two main branches of about equal length which are given off in the 

 same plane on opposite sides of the stem, and a large number of smaller 

 branches which arise all round the stem and main branches and by repeated 

 division give rise to the polyp-bearing twigs. Two of the lower branches are 

 flattened and leaf-like, and almost surround the stem, leaving only two small 

 free spaces between their bases. Below one of these free spaces two small 

 branches arise with rounded lower part and flattened upper part (like an um- 



