205 



collaret of 3-4 rows of curved spindles, and extending from this to the base of 

 the tentacles are eight groups of spindles considerably bent at the proximal end. 

 These are arranged in pairs or in groups of three. On contraction these do not 

 all collapse at once. The tentacles are first infolded, and then one spicule from 

 each point closes in over them ; the others are directed u[)wards and outwartls 

 and with those around the top of the verrucas present a very thorny appearance. 

 On further contraction the remainder close upon the infolded tentacles and so 

 form eight indistinct triangles. The whole anthocodia is then withdrawn until 

 only the points project. 



The spicules are all colourless : the following are the chief types with 

 measurements in millimetres : — 



Coenenchyma : {(t) A s/mii, slvjlitlii toothed spwe from one end of which a 



pair of warty branches arise. 

 Length of spine, 0'4 3 

 Breadth of spine, 03 025 

 Total length, 0-45 035 



Maximum breadth, 0-25 0-25 

 {tj) Club-shaped forms consisting of an almost smooth coni- 

 cal shaft with 3-6 branching, very warty projections. 

 Total length, O'S 0-5 04 



Maximum breadth, 0275 0-25 0-2 

 Length of shaft, 0-3 0-3 0-2 

 Breadth of shaft, 01 0-1 025 

 (c) Warty spindles, 04 x 0-03 ; 035 x 0-03. 

 Anthocodia^ — points : Spiny spindles bent like golf-clubs at one end, 



0-3 x0015. 

 Anthocodite — crown : Spiny spindles curved almost uniformly ; some are 



more spiny on the convex side, 0'45 x 0'02 ; 35 x 0'02. 

 Locality : Arakan Coast ; 13 fathoms. 



Echinomuricea ochracea, n. sp. 



Belonging to the Wood-Mason Collection, is a delicate colony, branching 

 in one plane. It is 100 mm. in height, and 120 mm. in breadth. Both the 

 primary and secondary branches arise almost vertically, but gradually curve 

 upwards. The branches are long, delicate and slender. Anastomoses occur in 

 several places. The axis is very soft, and is almost black in colour. The 

 coenenchyma is very thin, and in the older branches the axis is distinctly 

 visible through it. The verructe are small and densely crowded, especially on 

 the smaller branches ; they are very spinose, the needle-like apices of the 

 spicules projecting vertically, with no apparent arrangement, from the base to 



