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Fi g- 9 
PLATE VIII. 
Halysites peristephesicus, Eth. fil. 
. Transverse section showing labyrinthine linear fenestrules, with highly undulate margins 
of the corallite chains ; large broad-oval autopores with septa and bulging sides, 
separated by transversely oblong mesopores placed in deep re-entrant spaces. — x 9. 
. Longitudinal section displaying the moderately wide autopores with regular distant 
tabulre. — x 9. • 
Halysites chillagoensis, Eth. fil. 
Section of a corallum, cut both transversely and somewhat obliquely, in a poor state of 
preservation, but exhibiting the less rambling form of the fenestrules, the form of the 
autopores, and absence of mesopores. — x 8. 
Longitudinal section displaying tabulae in the autopores. — x 10. 
Halysites pycnoblastoides, Eth. fil. 
. Transverse section displaying strongly farcimentiform corallite chains ; oval or nearly 
round septate autopores ; large and irregular gonopores ; and large transversely 
elongate mesopores. — x 8. 
. Longitudinal section exhibiting wide and regularly tabulate autopores, with two cycles of 
septa in each visceral chamber, and a non-septate gonopore between two autopores. — x 8. 
