TH. MORTENSEN, 
20 
(Schwed. Südpolar-Exp. 
way on this subject; but I have thought it worth while to give a figure, showing the 
arrangement of the two specimens within the cyst (Fig. 1 6). 
The cyst wall is thick and tough, without any calcareous deposits. The female 
specimen is very large, measuring 13 mm. in length, by 8 mm. breadth, and 7. s mm. 
depth. The male specimen measures 3 mm. in length, 4 mm. in breadth. These 
Fig. 16. Part of disk and arms of Promachocrinus kerguelensis , showing a gall of Myzostoma cysticolum. 
The gall has been opened in order to show the position of the male upon the upturned lobes 
of the female. 3 /i. 
specimens thus are a good deal larger than any hitherto recorded, the largest female 
recorded by BOULENGER measuring 11.25 mm. in length, the largest male 2.2 mm. 
The female has its upturned lobes slightly overlapping. The male lies with its 
back towards the female, the parapodia being on the side turning against the cyst wall. 
Only one opening could be found in the cyst, even after removing the specimens. 
Besides this large cyst also a quite small one was found, attached to an arm near 
its base; it contained only one small, female specimen, measuring 1.8 mm. in length. 
It has the sides turned up in the usual way. 
