Spondylus gregalis (Morton, 1833)
MORTON, S. G. 1833. Supplement to the "Synopsis of the organic remains of the ferruginous sand formation of the United States (I). The American Journal of Science and Arts, 23: 288-294, pls. 5, 8. [p. 292, pl. 5, fig. 6]
1833 Plagiostoma gregalis Morton 1833
S. G. Morton, 1833, plate 5.
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«P. gregalis. (S. G. M.) Pl. V, fig. 6. Shell irregular, thin; back armed with concentric squamous plates; within obsoletely striated. Mostly found attached, and varies from one to three inches in length. Same as No. 1 of this Synopsis. Common in New Jersey.»
SAMUEL GEORGE MORTON, 1833
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«Remarks.— This species seems to be of rather rare occurrence as only fragments have been met with in the recent collections of the Survey. All the specimens on record seem to have come from the Navesink marl.»
WELLER, S. 1907. A report on the Cretaceous paleontology of New Jersey. Geological Survey of New Jersey, Paleontology Series, 4: ix, 871 p., pls. 1-111. [p. 487]
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Spondylus gregalis (Morton); S. Weller, 1907, A report on the Cretaceous paleontology of New Jersey, plate 53, figures1-3.
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«Shell rather above medium size when fully grown, and generally ovate in form, with the lower or attached valve somewhat the deepest. Cardinal area large, but short, much extended and flattened on the surface; transversely striated and with a narrow linear groove through the middle; teeth strong. Surface of the lower valve strongly lanjellose on the free portions; the attachment apparently being only small and near the apex; between the lamella, which are elevated, the surface shows indistinct radiations, which on the interior are quite distinctly marked and flexuose, and are comparatively fine. The upper valve not observed, except as shown on casts of the interior. In this condition it is shown to have been only very moderately convex at the apical portions, and to have been flattened or but very slightly convex toward the front, with the surface radiated as in the case of the lower valve, but whether the exterior has been lamellose or only simply radiated I have not been able to ascertain.
The figure given of this species by Dr. Morton, as cited above, is nearly circular in outline. Among the few casts which I have seen and one perfect lower valve there is none of that form, all being elongate-ovate, narrow toward the beaks and widened below, and all slightly curved to one side. On the casts the muscular imprint as shown on the lower side is quite large and uniform, and situated rather below the middle of the valve. The large entire valve of the species figured is neatly perforated through the solid part of its substance, showing the work of some boring mollusk. Formation and locality.— In the Lower Green Marls at Upper Freehold, Monmouth County, N. J., collected by Dr. Bruere.»
WHITFIELD, R. P. 1885. Brachiopoda and Lamellibranchiata of the Raritan clays and greensand marls of New Jersey. Monographs of the United States Geological Survey, 9: xx, 338 p., pls. 1-35 (Also published by New Jersey Geol. Survey, 1886). [p. 57, 58]
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Spondylus gregalis Morton; R. P. Whitfield, 1885, Brachiopoda and Lamellibranchiata of the Raritan clays and greensand marls of New Jersey, plate 9, figures 11, 12; plate 10, figures 1, 2.
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