EXPLANATION OF PLATE V. 



Fig. 1. I sis hippuris, Linnaeus. Part of a colu.iy showing 

 the palmate terminations of the twins. Photo- 

 graph of a specimen 7cm. in height, from off the 

 coast of Queensland. 



Fig. 2. Isis hippuris, Linnaeus. Photograph of a specimen 

 !3-3cm. in height, from Murray Island. Torres 

 Strait. 



