C M.WhHKIM s DIOMEIXE. |Q 



marked trumpet shape than the extreme upper end of the stem (Plate 

 XVII. Fig. 8) of the specimen, in which the upper pari of the calyx has 

 been torn off. 



In the piece of the stem of Plate XVII. Fig. 8, the upper eleven joints 

 measure 8mm. in beight. The uppermost joinl is smooth, and every other 

 joint has a median ridge. There are from sixteen to eighteen undulating 

 serrations to each joint The diameter of the upper joinl is 5.9mm., while 

 al a distance of 8mm. below, the diameter of the stem is still 5mm. 



This piece of stem is 92.50mm. in length. lis diameter at the lower 

 end is 3.75mm.; at the base of the calyx, 6.1mm.; at a distance of 

 1-1 nun. from the upper joint, the diameter is 4.5mm. To 14 mm. there 

 are nineteen joints from the upper joint. The first six joints occupy 

 4.25mm. At the smaller extremity twenty-two joints occupy 1 1 mm. In 

 the middle part of the stem twenty-two joints also occii]>\ 1 1 nun. The 

 five upper joints are the largest. 



The lirst six rings are .smooth, with here and there slight granulations on 

 joints below the calyx. The second, fourth, and sixth rings are slightly 

 granulated, or nearly smooth. The outer edge of the column is also smooth. 

 Below the seventh, every other ring is granulated, and passes gradually 

 into a rib, the alternating ring having a slight rib in the middle. At a 

 distance of about 2(J mm. from the base of the calyx, the rings alter- 

 nately carry a rib to the extremity of this fragment of stem. The artic- 

 ulations are but slightly serrated, as in the second portion of the stem. 

 The alternating joints are smooth. 



A piece of stem 89mm. long (Plate XVIII. Fig. 9), curved towards the 

 upper end ; 5.85mm. in diameter at the small end, and 7.30 mm. in diam- 

 eter at the large end; seven joints to 10mm. at the big end, eight joints 

 to 10 mm. in the middle, and nine joints to 10.5 mm. at the small end. 

 This piece must have been broken very close to the base of attachment 

 of this specimen, judging by the piece of stem collected in 1S91 off Mono 

 Puercos. 



The long piece of the basal part of the stem of a specimen collected by 

 the "Albatross," in 1891. off Mariato Point, in 7S2 fathoms, fortunately 

 retained the last joints, showing the mode of attachment of the stem in 

 this genus. The root is formed by the spreading of the last joint en- 

 croaching upon a part of the last joints of the stem, thus forming a base 

 of about three times the diameter of the stem (Plate XXVIII. Figs. 2-4). 



