97 



then continuing without any increase in size. It is radial in symmetry, mid 

 carries a large number of autoxooids which arise from all sides. The lower part 

 is corkscrew-shaped, leaving only the upper part straight. It reaches a length of 

 145 linn. 



The autoxooids are apparently arranged in short spirals. They are of medium 

 length, 18 mm., with a diameter of 2'5 mm. near the base. The walls are thick 

 and tough, but in the majority the tentacles are missing ; they are white in colour, 

 with a slight violet tinge in parts. Ova and embi-yos are present in most of 

 them. (See Plate VII. fig. G.) 



Siphonoxooids occur all over the rachis, and throughout the whole 

 length of the stalk. On the lower part of the stalk they are larger than 

 those on the upper part and than those on the rachis. Those on the lower 

 part vary from 0'3-0'5 mm. in height, and those on the rachis have a height 

 of 0'28 mm. 



Spicules seem to be restricted to the lower part of the stalk, where there are 

 small rods smooth and rounded at the ends, and also a few four-cornered forms. 

 The length and breadth of the latter is about 0'007 mm. 



Locality : Station 229 ; 9 29' 34" N., 75 38' E.; 360 fathoms. 



Umbellula kollikeri, u. sp. 



The stalk is quadrangular, in some parts oval in section. At the base of the 

 stalk there is a small swelling about a millimetre in thickness. The stalk is about 

 the same thickness throughout its whole length, but it has a very slight swelling 

 at its junction with the rachis. It is continued up the ventral surface of the rachis, 

 and forms a prominent spine below the place where the terminal autoxooid is 

 situated. Its length is about 39 '5 mm. 



The autozooids, five in number, are arranged bilaterally, but owing to the 

 twisting in the rachis they seem at first sight to be irregular. The two lowest are 

 larger than the others, and rise from the edges of the ventral surface, so that 

 there is a little of the ventral surface exposed between them, while the two 

 smaller appear to rise more from the dorsal surface, and have their bases closely 

 approximated. On the ventral surface the siphonoxooids are seen on the 

 small space exposed between the bases of the autoxooids and on either side of 

 the axis. On the dorsal surface they are arranged about the bases of the auto- 

 xooids and on the sides of the axis, the middle line being apparently free. 

 Where the siphonoxooids occur the spicules seem to have arranged themselvi 

 as to form a slight circular ridge around them. The length of the rachis is 11 '5 

 nun., of an autoxooid with expanded tentacles 12'5 mm., of the body of an 

 xooid nearly 5 '5 mm. 



There do not appear to be any siphonoxooids on the stalk. 

 13 



