EXPLANATION OF PLATE XVI. 



Fig. 1. Large rosettes with small nuclei, and five to eight rings. Syringo- 

 pora, Cave Flat. 



„ 2. Small rosettes with few rings, a double one to the upper right hand 

 of figure. Syringopora, Cave Flat. 



„ 3. Smaller rosettes. Syringopora, Cave Flat. 



„ 4. Surface of Heliolites, on the upper right hand both autopores and 

 siphonopores are obliterated, whilst on the lower left hand one 

 of the autopores remains open. Wellington Caves. 



[The figures, which are drawn from nature by Mr. G. H. Barrow, have 

 been reproduced by the photoline process.] 



