Spicules are entirely absent both in the stalk and in the rachis. 

 Localities : Station 324 ; 18° 0' 15" N., 9:5' W 45" E.; 448 fathoms. Statio]i 

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



Family UMr,ELLVUU.E. 



UmhoUnla durissima, Kolliker. 

 ,, dui'ci, u. sjj. 

 ,, intermedia, n. sp. 

 ,, ')vsea, n. sp. 

 ,, purpurea, n. sp. 

 „ elongata, n. sp. 

 ,, koUikeri, u. sp. 

 ,, radiata, n. sp. 

 ,, pendula, n. sp. 

 „ indica, u. sp. 

 sp. 



Umbellula durissima, Kolliker. 



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

 the Laccadives. Its total len2;th was over 450 mm. 



The long, cylindrical, flexible stalk is of a brownish colour, and apj^arently 

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

 quadrangular in section, with prominent edges, 4 To mm. in length. The axis is 

 nearly cylindrical. 



The rachis is a fiat rhomboid exjiansion of the stalk, and is covered with 

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

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



The autozooids are four in numl)er, 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 liody 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 rifts formed of minute spine-like processes. The following 

 measurements were taken of length and l)readth in millimetres : 



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



