92 



Spicules are entirely absent both in the stalk and in the nu-his. 

 Localities : Station 324 ; 18 0' 15" N., 93 30' 45" E.; 448 fathoms. Station 

 323 ; 16 25' N., 93 43' 30" E.; 463 fathoms. 



F,- 1 1 1 1 i ly UM n /;/, /. i < uitjE. 



Umbel/"/" durissima, Kolliker. 

 ,, dura, n. sp. 

 ,, intermedia, n. sp. 

 ,, rosea, n. sp. 

 /mrpurea, n. sp. 

 elongata, n. sp. 

 ,, kollikeri, n. sp. 

 ,, radiata, n. sp. 

 pendula, n. sp. 

 indica, n. sp. 

 sp. 



Umbellula durissima, Kolliker. 



A single specimen of this species was found at a depth of 1132 fathoms, near 

 the Laccadives. It's total length was over 450 mm. 



The long, cylindrical, flexible stalk is of a brownish colour, and apparently 

 without siphonozooids. At the lower end there is a spindle-shaped enlargement, 

 quadrangular in section, with prominent edges, 41'5 mm. in length. The axis is 

 nearly cylindrical. 



The rachis is a flat rhomboid expansion of the stalk, and is covered with 

 siphonozooids, with the exception of a small narrow line on the prorachidial sur- 

 face. They are very abundant at the bases of the autozooids. 



The autozooids are four in number, three large and one smaller ; their arrange- 

 ment is by no means definite, but they seem to be arranged more on the meta- and 

 para-rachidial surfaces. The average length of the body of the autozooid is 

 975 mm., that of the tentacles 11 '3 mm. The bodies of the autozooids and the 

 aboral surfaces of the tentacles are white, while the oral surfaces of the tentacles 

 and the pinnules are brown. The white colour of the autozooids and the aboral 

 surfaces of the tentacles is due to calcareous needles, which are very long and are 

 easily visible to the unaided eye. They are arranged roughly in eight rows on the 

 autozooid wall, continuous with the bands on the tentacles. 



The spicules of the lower end of the stalk are small rods or ellipses, with 

 longitudinally arranged ribs formed of minute spine-like processes. The following 

 measurements were taken of length and breadth in millimetres : 



0-23x0-03; 0'12x0'04; 0'05x0'018. 



