﻿EXPLANATION OF FLA IE XXIIL 



Fig. I. Echinodictyum elcgans, Lendenfeld ; x 1/3. 



Fig. 2. Crella incrustans, Carter, var. digitata, var. no%"., 

 encrusting a bivalve; viewed from the side; x i/j. 



Fig. 3. Crella incrusta')is, var. arcmicca, Carter; x 4/9. 



Showing the irregularity of form assumed by the 

 shallow-water New South Wales representatives of 

 the species ; the dermal encrustation is almost en- 

 tirely denuded ; the surface-grooves are less apparent 

 in the figure than in the specimen itself. 



