Manchester Memoirs, Vol. lix. (191 5), No. 1. 19 



About three rows of autozooids occur on the meta- 

 rachidial and pro-rachidial surface of the leaves, they are 

 yellowish in colour, and the tentacles white. The smaller 

 spicules of the leaves are arranged round and parallel to 

 the anthocodiae, apparently forming a very complete 

 means of protection. There are blackish patches on the 

 autozooid areas of the meta-rachidial surface of some of 

 the leaves. The siphonozooid plate is median extending 

 far up the leaf. Well developed gonads are seen on the 

 meta-rachidial surface of the leaves underneath the auto- 

 zooids. 



The spicules of the outer part of the stalk are rod- 

 like, but rounded off at each end where they are also 

 slightly crenated. They have a number of longitudinal 

 lines on the surface, and also at each of the long ends 

 there are concentric lines. Their size varies from about 

 01004 X 0*007 to OT656 x 0*023 mm - The spicules of the 

 rind of the rachis are very similar to those of the outer 

 part of the stalk, but they terminate rather more pointedly, 

 and are rather longer. The larger spicules are about 

 0*2300 X 0*030 mm. The spicules of the leaves are long 

 rods. No spicules occur in the inner part of the stalk, 

 nor in the inner part of the rachis. 



The species of the genus Pteroeides appear to vary so 

 much that it is difficult to fix upon the characters which 

 should be used in their identification. 



Hickson holds that the least variable characters are : 



(1) The arrangement and number of the rays in the leaf. 



(2) The character and size of the spicules of the outer 

 cortex of the stalk. (3) The number of leaves. (4) The 

 ratio between width and length of the rachis. 



This species appears to be new and belongs to 

 Kolliker's group of Pteroeides pellucidurn. I regret to 

 add another species to the long list in this genus. Few 



