The Quarterly journal of the Geological Society of London . r becomeobliterated, while the intercecial valleys become so full of secondarytissue that this tends to overflow the intraterminal front-wall. part 3] THE KELESTOMIX-E 209 (fig. 5). The last condition is never attained by the Kelesto-minae; but both Kelestoma and Morphasmopora have abundantintereecial secondary tissue with elongate lacuna?, and, in Mor-phasmopora jukes-brownei, these elongate lacuna?, whether in theform of long slots or very much lengthened triangles, take ona curved or wavy shape, and often simulate the apertures ofa
The Quarterly journal of the Geological Society of London . r becomeobliterated, while the intercecial valleys become so full of secondarytissue that this tends to overflow the intraterminal front-wall. part 3] THE KELESTOMIX-E 209 (fig. 5). The last condition is never attained by the Kelesto-minae; but both Kelestoma and Morphasmopora have abundantintereecial secondary tissue with elongate lacuna?, and, in Mor-phasmopora jukes-brownei, these elongate lacuna?, whether in theform of long slots or very much lengthened triangles, take ona curved or wavy shape, and often simulate the apertures ofavicularia. Fig. -i. — Diagram representing a Fig. 5. — Diagram showing a still further development of the further development of secon- conditioii representedin fig. 3. dary tissue (black) which now The secondary tissue (black) completely fills the intereecial has increased in amount. valleys^ and has no median lac a ace.
Size: 1323px × 1889px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1840, bookidquarte, booksubjectgeology
