EXPLANATION OF PLATE X. 



Fig. L — Mediaster motiacantlms, sp. iiov. Photograph of the 

 holotype from six miles east of Cape Hawke, New 

 South Wales, 47-50 fathoms. Abactinal view. One- 

 half natural size. 



Fig. 2. — Mediaster monacanthus, sp. nov. Photograph of the 

 paratype from six miles east of Cape Hawke, New 

 South Wales, 47-50 fathoms. Actinal view. One- 

 half natural size. 



