98 



The spicules of the autozooids are somewhat triangular in section, with one of 

 the sides flatter than the others, and with a granular appearance throughout the 

 whole length. 



Locality : Station 118 ; 12 20' N., 85 8' E. ; 1803 fathoms. 



Umbellula radiata, n. sp. 



This species is represented by a complete colony, 857 mm. in length. 



The stalk is long, and has a large swelling at the lower end, which extends 

 for a distance of about 213 mm. upwards. From this point the stalk gradually 

 tapers till it reaches the beginning of the rachis, where it seems to run up the 

 centre, and does not become evident on either of the surfaces. On the lower 

 swelling, which has a diameter of 7 mm., four prominent ribs are present, two of 

 which can be traced throughout the whole length of the stalk. The stalk at the 

 upper end of the swollen portion has a diameter of only 175 mm. 



The axis is roughly quadrangular, with the angles rounded off. On one of 

 the sides in the lower portion a groove is present ; in the upper portion it becomes 

 almost cylindrical. 



The rachis is longer than usual, and bears a large number of autozooids, which 

 are arranged in whorls. The lowest whorl has four. 



The autozooids are long and slender (46x2'5 mm.), with moderately long 

 tentacles ; they are brownish in colour, with the upper portion almost black. 



The tentacles are long and tapered, with one row of pinnules on each side. 

 The pinnules are short, rather blunt, and widely separated. 



The surface of the autozooids and the tentacles is covered by a brownish layer, 

 which is honeycombed in appearance, and easily rubbed off. On treating a portion 

 of this with acid, no effervescence was observed. 



The siphonozooids occupy the whole surface of the rachis between the auto- 

 zooids ; they are small, brownish, wart-like projections. On the swelling at the 

 lower end of the stalk there are several smaller projections, which may be 

 .siphonozooids. 



Among the typical autozooids there are two or three polyp-like bodies, 20 mm. 

 in length by 4 '5 mm. in width. Tentacles are represented by small blunt conical 

 projections, in one case with seven minute pinnules present on each side. In these 

 polyps the stomodseum and gastric filaments are short and simple, whereas in the 

 typical autozooids they are long and convoluted. 



No spicules were found either in the polyps, the rachis, or the stem. 



Locality : Audanians ; 490 fathoms. 



