EXPLANATION OF THE PLATES. 



Plates I.-XXX. 

 [Collotype reproductions of photographs.] 



PLATE I. 

 A large specimen of Turbinaria crater, x i. 



PLATE II. 

 The Type specimen of Turbinaria danw, X i, slightly from above. 



PLATE III. 



The Type specimen of Turbinaria cdwardsi, X i, seen from above. 

 ,, „ Turbinaria pustulosa, x §, from the side. 



PLATE IV. 



The Type specimen of Turbinaria aurantiaca, x f , seen from above. 

 Turbinaria plicata, X |, seen from above. 

 ^, „ Turbinaria undata, X |, seen from above. 



„ „ Turbinaria laminata, x §, seen from above. 



PLATE V. 



The Type specimen of Turbinaria spcciosa, x i, from the side, 

 „ „ Turbinaria mollis, x |, with young cup. 



PLATE VI. 



The Type specimen of Turbinaria nidifcra, x §, seen from above. 



„ Turbinaria ahnoi-7nalis, seen from above. 



,, Turbinaria pocilliformis, seen ivoia above. 



A young specimen of Turbinaria pcltata, from the side. 



