EXPLANATION OF PLATE XXXIIL 



Fig. I. Clathria transiens, sp. nov., typical form; x 2/3. 



Fig. 2. Clathria transiens, form (b) ; x 3/5. 



Fig. 3. Clathria transiens, form (c) ; x 3/5. 



Fig. 4. Clathria caelata, sp. nov. ; x 2/t,. 



