EXPLANATION OF PLATE XVIII. 



Fig. 1. Antigonia rhomboidea, sp. nov. Type, 115 mm. 

 long, from between Gabo Island and Cape Everard, 

 Victoria. 



Fig. 2. Antigonia rubicunda, Ogilby. Type, 65 mm. long, 

 from north-east of North Reef, Queensland. 



