PLATE IX. 
Halysites australis, Eth. Jil. 
Fig. 1 . Transverse section with a pentagonal fenestrule ; slightly undulated corallite chains ; 
immersed appearance of the long-oval septate autopores, and well-marked mesopores. — • 
x 8. 
Fig. 2. Transverse section of a fragment showing a peculiar form of cellular growth occupying 
a fenestrule. — x 8. 
Halysites chillagoensis, Eth,. Jil. 
Fig. 3. Portion of a naturally weathered specimen. — x 
Haly sites lithostrotonoides, Eth. Jil. 
Fig. 4. Portion of a naturally weathered corallum exhibiting a fenestrule partially bisected by 
an incomplete corallite chain. — x 8. 
Halysites sp. 
(! H. labyrinthica, Gold/., and H. cavernosa, F.-B.) 
Fig. 5. Transverse section exhibiting very large round autopores, and cellular mesopores ; the 
corallite chains are highly farcimentiform. — x 8. 
Fig. G. Longitudinal section displaying the very large autopores, with both complete and 
incomplete tabu he ; and the mesopores with arched tabulae. — x 8. 
