EXPLANATION OF PLATE IV. 



Fig. I. — iSpiculos of Mopsta ijlumacea, fsp. nov. ; from the 

 specimen tlLriired oi\ Plate vii. 



Fig. 2. — Spicules of Mopsea repens, sp. nov. ; tioni the 

 specimen tiuured on Plate viii. 



Fiiz. .S. — Si:)icules of Phimarella australis, sp. nov. ; from the 

 specimen figured on Plate x. 



Fig. 4. — Amphilaphiti plumacca, Thomson and Mackinnon. 

 Photograph of a specimen 17-5cm. in height, from 

 the south east coast of Australia. 



Fig. 5, — CtenoceUa pectinata (Pallas). Branches showing 

 distinct median furrow. Photograph of a specimen 

 from eight miles east of Sandon Bluff, Queensland, 

 35-40 fathoms. 



