. Bulletins of American paleontology. Carapace Text-figure 6. âPlastron detail of Anonialocysiiles cornulus. This figure IS based on USNM 33661A (PI. 2. fig. 5).. m'5 m6 m5 Text-figure 8. âInternal plastron surface of Anonialocysiiles ror- «M/U5. This figure is a composite based on USNM 33661Fand AMNH 2720 (PI. 3, figs. 4, 7. 9. 13). Extending from M'l to the muscle pit in M4 is the diagonally-transverse septum. Tnangular area devel- oped mostly on M'l-MI is the raised (thickened) oral field. The triangular area developed on m'5, m6. mS. A. and CS is the thickened distal field. Between M'4-in
. Bulletins of American paleontology. Carapace Text-figure 6. âPlastron detail of Anonialocysiiles cornulus. This figure IS based on USNM 33661A (PI. 2. fig. 5).. m'5 m6 m5 Text-figure 8. âInternal plastron surface of Anonialocysiiles ror- «M/U5. This figure is a composite based on USNM 33661Fand AMNH 2720 (PI. 3, figs. 4, 7. 9. 13). Extending from M'l to the muscle pit in M4 is the diagonally-transverse septum. Tnangular area devel- oped mostly on M'l-MI is the raised (thickened) oral field. The triangular area developed on m'5, m6. mS. A. and CS is the thickened distal field. Between M'4-in'5 and M4-m5 are the muscle pits. These pits probably contained muscles thai moved the spines toward the sagittal plane and (probably) muscles that were part of the anal sphincter system. Overlayering of plate matenal to form the walls and deepen the muscle pits has obscured the plate sutures. Narrow inner marginal grooves run the length of the theca from the muscle pits to the extremities of M2-M'2. Table 1.âExplanations of plate abbreviations used in this paper. 'MA- CM3^ M4 n V _/ c d â â \ CM1 0 \ ^1^ \ ^ ^^ M3 ^^^^f--^^^ M RA Text-figure view of Anomalocysliles cornulus. This figure is based on USNM 33661A (PI. 2, fig. 2). A: anomalocystitid plate a-s: supracentral plates CM1-CM2: carapace marginal plates {right side) CM'l-CM'2: carapace marginal plates (left side) CM3, CM'3: carapace margmal plate (sagittal) CS: central infracentral plate DS: distal infracentral plate LA; left adaulacophoral plate MA: median adaulacophoral plate Ml-MS: margmal plates (nght side) M'l-M'5: marginal plates (left side) mS: plastron distal-marginal plate (right side) m'S: plastron distal-marginal plate (left side) ni6, in'6: plastron distal-marginal plate (sagittal) RA: right adaulacophoral plate. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not
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