207 



acteristically spinose a})pearance. The anthocodiic are almost completely 

 retractile, but there is a definite, almost horizontal operculum. This consists 

 of eight groups of long fusiform spicules arranged for the most part in parallel 

 pairs, but sometimes two occur, forming an acute angle directed towards the distal 

 ends of the tentacles and enclosing a single spindle. These extend to the base 

 of the tentacles, and there is also a hint of a collaret of curved, elongated 

 spindles. 



The spicules' of the co3nenchyma and verrucjvj are very characteristic, and 

 though they seem diverse in form may yet be regarded as diverging from a 

 common type. All consist of a smooth spine from the base of which two or 

 more warty, simple or branching, arms arise. The following are the measure- 

 ments in millimetres of the more common forms : — 



(1) 2 arms diverging in the same plane, 0'25 x 0"15 — spine, 015 ; 

 ((/) Sharp smooth si)ines with — 



0-25 X 0-2— spine, (J- 15. 



(2) 3 projecting arms almost equal, 0"35 x 0'3 ; 0'4 x 0'31. 



(3) 3 unequal arms one again branching, 0*25 x 0*2 — smooth spine, O'l. 



(4) 4 projecting arms with 2 or more branched, 0'55 x 0-4 — smooth 



spine, 0'22. 



(5) 5 projecting arms, 0'4 x 0*2 — smooth spine, 0*2 ; 0'35 x 0'2 — smooth 



spine, 01 8. 



{h) Tetra-radiate forms with an almost inconspicuous smooth nucleus, 

 0-35 X 0-35. 



{e) Irregular clubs with numerous .short warty arms, 0'(3 x 0"4 ; 0'25 x 0*15. 



Those of the anthocodite and tentacles are slightly warty or spiny spindles. 



Anthocodi;\i : 07 x 0-05 ; 07 x 0075 ; 0-45 x 0-05. 



Tentacles : 015 x 002 ; 01 x 0-02. 



A young Pearl Oyster is attached to one of the branches of the smaller 

 specimen, and there is a cirripede gall overgrown by polyp-bearing coenenchyma 

 on the larger, which also bears a young crinoid. 



Locality : Andamans. 



Echinomuricea splendens, n. sp. 



In the Wood-Mason Collection there are two small specimens of an 

 Erhinomurirea which seem to be new. The larger is 100 mm. in height, and 

 55 mm. in breadth ; the other is 90 mm. in height, and 55 mm. in breadth. 

 The branching is in one plane, but no trace of anastomosis occurs. From an 

 ascending main stem, lateral branches are given off almost perpendicularly. 

 After a short distance, however, these curve upwards, and eventually run almost 

 vertically. The secondary branches are given off in the same manner. The 



