20 



TH. MORTENSEN, 



(Schwed. Siidpolar-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. i6). 



The cyst wall is thick and tough, without any calcareous deposits. The female 

 specimen is ver>' large, measuring 13 mm. in length, by 8 mm. breadth, and 7.5 mm. 

 depth. The male specimen measures 3 mm. in length, 4 mm. in breadth. These 



^. f^ 



\^ 



Fig. 16. Part of disk and arms of Promachocrhiiis ki^rgiielensis^ showing a gall of Myzostoma cvsticoium. 

 The gall has been opened in order to show the position of the male upon the upturned lobes 



of the female, ^/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 i.s mm. in length. 

 It has the sides turned up in the usual way. 



