. Bulletins of American paleontology. •mlm. 2mm Text-figs. 3, 4. Syringocrinus sinclairi Parsley and Caster, sp. nov., terminology of various plates. 3. Plate pattern of the concave ventral surface of Syringo- crinus sinclairi, sp. nov., based on paratype No. I (GSC 17521) ; aim, anterior lateral marginal; am, anterior marginal; b, arm, or "brachiole"; dm, distal marginal; mlm, median lateral marginal; of, opercular flap; pirn, posterior lateral marginal; pin, proximal marginal. Dotted lines, approximate suture lines ; broken lines, problematic sutures. 4. A generalized cross-section
. Bulletins of American paleontology. •mlm. 2mm Text-figs. 3, 4. Syringocrinus sinclairi Parsley and Caster, sp. nov., terminology of various plates. 3. Plate pattern of the concave ventral surface of Syringo- crinus sinclairi, sp. nov., based on paratype No. I (GSC 17521) ; aim, anterior lateral marginal; am, anterior marginal; b, arm, or "brachiole"; dm, distal marginal; mlm, median lateral marginal; of, opercular flap; pirn, posterior lateral marginal; pin, proximal marginal. Dotted lines, approximate suture lines ; broken lines, problematic sutures. 4. A generalized cross-section of the den- drostyloid of Syringocrinus sinclairi, sp. nov. D, dorsal plate; L, left plate; R, right plate; f, sutural flange; /, lumen; n, node. laterally adjusted theca possessing a single brachiole on the left The dorsal expression of the left median lateral marginal is broadly quadrate. The posterior lateral marginals (plm) are large polygonal plates which are fairly equal in size and similar in outline. Their major development is ventral. The marginal component of the left plate is limited clue to the proximal elongation of the median lateral marginal, while its counterpart has a marginal component nearly equal in length to its ventral diameter. The ventral sur- face of the right plate has a low, circular, central boss surrounded In concentrically arranged, pebbly prosopon. Although it can not sThe zygomorphy implied in this analysis and nomenclature may be an illusion, and most certainly no homology with the Mitrata is implied in em- ploying similar plate names in the two orders. It is a striking example of parallel development which creates the remarkable analogues in New World solutes and placocystid mitrate 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 I
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