530 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



The calyx agrees ■with that of Hathroinetra sarsii in the corresponding stage, 

 the IBr series having become rather broad and the orals having become widely 

 separated from the radials. 



The orals are of the same shape as those of Hathrometra prolixa. 



There are no infrabasals. 



The cirri are radial in position and evidently have appeared serially. 



The first pinnules appear on the twelfth or thirteenth brachials. 



The three proximal columnals are conspicuously wider than the rest. These 

 and the two following are quite short. In the sixth the portion below the median 

 annulus has begun to lengthen, the length of the columnals increasing from this 

 point distally. The median annulus is very conspicuous in the more proximal 

 segments, these being distinctly wider in the middle than at the ends. In the 

 fully formed segments where the ends are expanded the median portion is still 

 somewhat prominent. 



In the specimen at Upsala, which is attached to a cirrus, the pinnules have not 

 yet appeared. Tlie calyx measures 2 mm. and the colmnn 5 mm. in length. 



The orals are still in contact with the radials and are of the same shape 

 as those of Ilathromefra froUxa. 



The proximal columnals are only slightly broader than those beyond. 



Mortensen notes that the length of the column is so different from that of 

 the other specimen and from that in the specimen recorded by Levinsen (which 

 had a column 14 mm. long) that it seems scarcely credible that it could reach 

 a simlar length in a corresponding stage. 



Dr. K. A. Andersson states that one of the specimens subsequently described 

 by Doctor Mortensen was foimd attached to the cirri of an adult. 



PR0MACH0CEINU8 KERGUELENSIS. 

 Figs. S.Sl-937, pp. 5.3r?, 53S, 541, 545, .549. 



A large series of the pentacrinoids of Promachocrinus kerguelensis is at 

 hand, which forms part of the crinoidal material collected by the naturalists 

 of the German South Polar Expedition in the vicinity of Gaussberg in 1902-03. 



The pentacrinoids brought back by the Gauss were captured at all seasons 

 of the year. The dates on which the various developmental stages were found 

 are as follows: 



Least developed specimens, with no radial structures : February 7, 8 ; Novem- 

 ber 9, 22, 24. 



Specimens showing the development of radial structures: January 12, 28; 

 Februai-y 7, 15; December 26. 



Specimens with the radials showing considerable growth : April 14. 



Specimens with IBr, just appearing: November 9. 



Specimens with the radials not quite in contact : January 12 ; August 12. ■ 



Specimens with the radials just in contact: January 28; February 7, 8; 

 April 17 ; June 25 ; July 31 ; November 9. 



