308 



siplionozooids leaving no bare streak ; verruca? bird-nest-like, formed of long 

 spicules arranged in four groups and terminating in four triangular points ; racliis 

 gradually increasing in thickness from below upwards ; stalk cylindrical with a 

 slight swelling on the lower half ; a^is quadrangular with a shallow groove on 

 the para-rachidial surfaces ; spicules abundant both in the rachis and in the cutis 

 of the stalk ; those of the stalk rough scales, those in the rachis typically smooth 

 spindles and cylinders with many branched and irregular forms. 



This new genus is allied to Sttjloheleinnon, Kolliker, and Sti/lohelemyioides, 

 Thomson and Henderson; the following table gives the chief points of 

 difference : — 



Parabelemnon indicum, n. sp. 

 Plate III. Hgs. 6 and 7 ; Plate IX. fig. 4. 



A complete, well-preserved colony with the following measurements in 

 millimetres ; — 



Total length of colony . . . 190 mm. 

 Length of rachis . . . .110 mm. 

 Maximum breadth of rachis . . 4 mm. 

 Length of stalk .... 80 mm. 

 Breadth of stalk . . . . 28 mm. 

 Breadth of axis 12 mm. 



The axis extends from end to end of the colony ; it is square in section 

 with a deep groove on each of the para rachidial surfaces ; the breadth is almost 

 uniform throughout. The stalk is cylindrical, but tapers gradually at the lower 

 end, the last 30 mm. of which is occupied by a slight swelling. The rachis 



