Box 25, Folder 13: Paleontology Notes 5? - Crinoidea B

Megistocrinus rugosus, Lyon & Casseday, Am Jour Sci. 2d Ser. 28p 243 (1859)

Devonian (a few feet below Black Shale)

Bear Grass Creek Ky

4 p 325

Genus Melocrinites, Goldfus; Hall

Pal. of N.Y. Vol. 2 p. 227 -

Columna teres, canali tereti vel quinque= =lobo perforato, brachiis auxiliaribus.....; pelvis articulis quatuor; costales primarii et secundarii quini, hexagoni, sibi invicem impositi; intercostales quinque, hexagoni costalibus impositoe, hexagonoe; interscapulares quaterni, in oris regione quinque; brachioe quinque; os in latere verticilis verticis.

The only crinoid with four pelvic plates succeeded by five costals.

Palaechinus (Melonites) multipora, Owen + Norwood

St Louis Limestone

Missouri

Melocrinites sculptus, Hall, Pal. of N.Y. Vol. 2 p. 228 pl. 49 A fig. 2

Base concave; column round; articulating surfaces of joints strongly striated; striae reaching nearly or quite to the canal; pelvic plates spreading outward and downwards, enclosing the column, and having their surfaces marked by a few concentric lines; costals plates five, bending slightly downwards to their centre, from which point they are suddenly bent upwards; surface of costal plates marked only ly concentric lines or ridges; costal plates, at the point of bending upwards, marked by a strong angular node on each side, and below this an equally prominent one in the centre of the plate; near their upper margins these plates are each marked by three prominent,

sharply angular ridges, which proba= bly corresponding to similar ones on the succeeding plates.

D 0.9

Middle Silurian - Niagara Limestone

Lockport. N.Y.