PLATE VIT. 
Halvsites Sussmilchi, Elh.Jil. 
1. Transverse section showing the fenestrules with strongly undulate margins, and highly 
farcimentiform corallite chains ; round-oval autopores ; mesopores in long re-entrant 
spaces ; and large polygonal gonopores.- — x 7. 
2. Another transverse section, with imperfectly formed fenestrules, and disunited and new 
corallite chains. — x S. 
3. Longitudinal section, displaying the autopores with low wide visceral chambers and 
more or less horizontal tabulae ; a mesopore at the left centre, and a gonopore at the 
right centre. — x 8. 
Halysites orthopteroides, Elh.fil. 
4. Transverse section showing the labyrinthine fenestrules; slightly undulate margins of 
the corallite chains ; long oval autopores, separated by mere slit-like mesopores placed 
in very shallow re-entrant spaces. — x 8. 
5. Longitudinal section displaying the wide autopores, with their concave tabu he ; and 
narrow pipe-like mesopores. On the extreme upper right-hand is a gonopore wedged 
between two autopores. — x 8. 
Halysites australis, Eth.Jil. 
6. Longitudinal section exhibiting wide autopores with numerous cut-ends of septal spines ; 
and narrow pipe like mesopores with distant tabula?. — x 8. 
