. Bulletins of American paleontology. CM1 Text-figure 15. —Carapace of Enoplouru punctata. This figure is based on USNM 91856 (PI. 4, fig. 5). Note that the spines are more massive and terete than the thinner, blade-Hke spines of Enoploura popei. Also, note that the distal lip is more robust than that in Enoploura popei. Forexplanationsof plate abbreviations, see Table 1 (foldout inside back cover). for muscles between the thecal interior and the spines, as well as serving as the anal opening of the gut. That the anus probably opened through the right aperture is suggested by the fact that the
. Bulletins of American paleontology. CM1 Text-figure 15. —Carapace of Enoplouru punctata. This figure is based on USNM 91856 (PI. 4, fig. 5). Note that the spines are more massive and terete than the thinner, blade-Hke spines of Enoploura popei. Also, note that the distal lip is more robust than that in Enoploura popei. Forexplanationsof plate abbreviations, see Table 1 (foldout inside back cover). for muscles between the thecal interior and the spines, as well as serving as the anal opening of the gut. That the anus probably opened through the right aperture is suggested by the fact that the diagonal ridge, or sep- tum (Ubaghs, 1968a, p. S528) (PI. 4, fig. 5, PI. 5, fig. 4), a probable secretion of the gut-support mesentery, extends directly to it. Spine sockets are not so well defined as in some younger species, but there seems to be little difference in their basic configuration. Spines are apparently te- rete throughout and show little, if any, of the distal compression seen in Cincinnatian species. Total rela- tive length of the spines is not known; there is no assurance that the distal ends of any of the preserved spines are present. Those that are preserved appear to be unusually short (PI. 4, figs. 5, 8, 9, PI. 5, figs. 1, 3, PI. 6, fig. 10). The proximal aulacophore is made up of about 10 or 11 segments, of which three or four are hidden by the carapace, but their inferior tetrameres are exposed in the plastron embayment. The proximal aulacophore. Text-figure 16. —Plastron of Enoploura punctata. This figure is based on USNM 91854 (PI. 5, fig. 8). Morphologic details of the external distal end of the plastron are poorly known. For explanations ofplate abbreviations, see Table 1 (foldout inside back cover).. 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 perfectly resemble the original Paleontological Research Inst
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