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

Melanites multipora

Jour Acad. Nat Sci Pha. (1846) p 225 figs 1.2.3.

Upper Carb. Limestone

St Louis, Missouri;

Crinoidea

4 p 345

Genus Myelodactylus Hall

Pal. of N.Y. Vol 2 p 191 (1852)

This genus is proposed by Mr. Hall, the remarkable feature of which is the foramen or medullary canal penetrating the column of joints, a character not existing in the species where the fingers are composed of a double series of joints, and which is not conspicuous in the simple jointed fingers without tentacula.

Gr myelos (medulla)

& daktylos fingers

Myelodactylus convolutus, Hall, Pal. of N.Y. Vol. 2 p. 192 pl. 42 figs. 5 & 6.

Fingers? composed of a single series of thin joints, which are slightly nodulose or tubercular on the back; ends of the joints somewhat semicir= cular or cresent=form, withe the extrem= ities truncated; tentacula composed of numerous rounded or slightly nodulose joints, which are attached to the truncated ex= tremities of the finger= joints by a ten= don inserted into a perforation in the joint; fingers usually incurved or convolute; plates penetrated vertically by an oblong quadrangular canal, through which probably passed a strong tendon connecting the whole together; surface of each plate marked by a pen= tagonal depression, within which are elevated ridges, the whole intended for

for the strong attachment of muscular fibres connecting the plates; outer edges of the plate, upon the back, marked by two, or sometimes three minute grooves or perforations communicating with the muscular impression upon the upper surface.

Middle Silurian - Niagara Shale

Lockport N.Y.

Myelodactylus brachiatus, Hall

Pal. of N.Y. Vol. 2 p. 232 pl. 45 fig. 7.

Fragment of an arm, somewhat semicylindrical or unequally pen = tagonal; lateral apendages cylindri= cal, strongly articulated; canal transversely oval, with marks of muscular impressions towards the circular margin very strongly impressed.