. The Canadian journal of science, literature and history. NOTES ON THE FOSSILS OF ONTARIO. 137 sontal outgrowths of the calice. which are placed at the same level in -contiguous corallifces and form a series of complete floors. Walls of the theca complete anl well developed, meeting in the centre of the theca Avith a distinct and well developed columella. Costal radii prolonged over the successive exothecal floors. Tabulae rudimentary or absent (1).. -Fio. 4.—AstrcRophijllum graclle, Nich. and Hinde ; a, Side view of a fragment, enlarged, shewing the mural expansions ; b, Fragment Aaewed from
. The Canadian journal of science, literature and history. NOTES ON THE FOSSILS OF ONTARIO. 137 sontal outgrowths of the calice. which are placed at the same level in -contiguous corallifces and form a series of complete floors. Walls of the theca complete anl well developed, meeting in the centre of the theca Avith a distinct and well developed columella. Costal radii prolonged over the successive exothecal floors. Tabulae rudimentary or absent (1).. -Fio. 4.—AstrcRophijllum graclle, Nich. and Hinde ; a, Side view of a fragment, enlarged, shewing the mural expansions ; b, Fragment Aaewed from above and greatly enlarged, showing the calices, the confluent mural expansions, and the costal radii. There are some points in the structure of the corals here referred to which we cannot actually make out with the materials at present in our hands; and we are therefore uncertain whether they really constitute a new genus, though we cannot place them under any genus already described. From Smithia, Edw. and H., the genw^ Astrceophyllum is distin- guished by the possession of a distinct columella, and by the fact that the corallites are united not only by costal radii, but by well develoi^ed exothecal floors. From Phillipsastroia, the i^resent genus is distinguished by not having the corallites united laterally along their whole length, and in having the calices definitely circumscribed. From ITcdmeophyllum, Billings, the genus is separated by the well developed, not rudimentary, septa, and by the fact that the latter possesses vesicular tabulae. From Heliophyllum colligatum, Billings, which probably forms the type of a separate group, Astrceophyllum is distinguished by the possession of a distinct columella, and the apparent absence of septal spines or tabulae. From Thecostegites, Edw. and H., the genus is distinguished by its well developed septa und columella, and the apparently obsolete 5. Please note that these images are extracted from scanned page images that may have
Size: 2407px × 1039px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1860, bookpublishertoron, bookyear1868
