392 DISCOVERY REPORTS 



The ovicell of F. simplex MacGillivray is immersed in a kenozooecium. The frontal 

 wall of the kenozooecium, which forms the ectooecium, is wholly uncalcified and col- 

 lapses into wrinkles on drying (Fig. 26 A), the space between the entooecium and the 

 walls of the kenozooecium then forming the " depression " mentioned by MacGillivray. 

 A longitudinal wrinkle may sometimes give the impression of a keel, but the ovicell is 

 not keeled. 



Fig. 26. A. Farciminaria simplex MacGillivray. 97 . 5 . 1 . 467. Port Phillip Heads. B. Farciminellum antarcticum 

 sp.n. 30.2.24.1. Australian Antarctic Expedition, St. 4, off Adelie Land. 



Both drawn from dry specimens seen by reflected light. X. slightly crushed ovicell showing splitting 

 along median line. 



This species has hitherto been known from more or less fragmentary material. The 

 present specimens show that the colonies attain a considerable size. The material from 

 St. TN 338 comprises six clumps. Plate VIII shows one of the smallest, the largest 

 being 22 cm. long and profusely branched. The proximal branches are enveloped in a 

 thick mass of rootlets so that the colonies appear to originate in a branching stalk. 



