This testimony is expanded in the remarkable words which Irenaeus addresses to Florinus:" I saw thee when I was still a boy Orals €TL 6v) in Lower Asia in company with Polycarp. ..
2), consists of five large triangular plates, alternating with the radials, and called "orals," because they roof over the mouth.
Some of the thecal plates, infrabasals I B, basals B, and orals 0 are forming around the bodycavities r.pc and l.pc; p is the water-pore.
Better than some erroneous observations on certain fossils, which were supposed to show a plate at the oral pole between the five orals; but this plate, so far as it exists at all, is now known to be nothing but an oral shifted in position.