. Bulletin - New York State Museum. Science. NIAGARA FALLS AND VICINITY 225 margin obliquely inward to the eyes, and thence almost directly for- ward, cutting the margin separately. Thorax with nine or 10 seg- ments and grooved and falcate pleurae. Pygidium Jarge and flat, the segments commonly ending in spinous prolongations. Doub- lure very broad. Lichas boltoni (Bigsby) (Plate 17) (Hall. 1852. Pal. N. Y. 2:311, pi. 69, 70) Distinguishing characters. Large size; nasute anterior end; large central and obHque lateral lobes of glabella; scabrous surface with backward directed acute pustules; st
. Bulletin - New York State Museum. Science. NIAGARA FALLS AND VICINITY 225 margin obliquely inward to the eyes, and thence almost directly for- ward, cutting the margin separately. Thorax with nine or 10 seg- ments and grooved and falcate pleurae. Pygidium Jarge and flat, the segments commonly ending in spinous prolongations. Doub- lure very broad. Lichas boltoni (Bigsby) (Plate 17) (Hall. 1852. Pal. N. Y. 2:311, pi. 69, 70) Distinguishing characters. Large size; nasute anterior end; large central and obHque lateral lobes of glabella; scabrous surface with backward directed acute pustules; strongly striated doublure; three broad lateral lobes of pygidium, contracting to angular ter- minations. Found in the lower Rochester shale at Niagara. 'Rare and in fragments. Common at Lockport and elsewhere (Hall). Genus encrinurus Emmrich [Ety.: encrinus; ou/>a ==tail (from the resemblance of the py- gidium to a crinoid stem)] (1845. Neues Jahrb. p. 42) Cephaion narrow, wider than long, tuberculated; glabella pyri- form, prominent; free cheeks narrow, separated in front; eyes small, elevated, on conic prominences. Thoracic segments 11. Pygidium triangular, with numerous segments. Encrinurus ornatus Hall & Whitfield <'. ' --^ /^. (Fig. 157). Cybele punctata / ^1 Hall (1852. Pal. 2:297, pi A66) j Distinguishing characters. Strongly ] pustulose surface of cephaion; pyriform % glabella; elongate triangular pygidium, with concavity along the center of the axis, tuberculated at intervals; slender curving ridges of pygidial limb, tuberculated at intervals. Found in the lower Chnton Hmestone at Niagara. Rare. Also ^t Lockport (Hall). y W Fig. 157 Encrinurus ornatus. 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 New York State Museum; New York State Museum. Albany : New York State Education Dept
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