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.] 
