Box 25, Folder 12: Paleontology-Notes 5? Crinoidea A.

series alternating with that laterally in just a position; first subdivision taking place in the fourth or fifth plate from the pelvis; second subdivision occurring on the sixth or ninth plate from the first one, and beyond this at irregular intervals; plates obtusely angulated on the exterior surface from the centre of the base to the sinus on the upper edge articulated on their upper and lower surface by marginal crenulations; on the side where the plate of the second series rests on the column, there are two supernumerary plates intercalated on the left hand side and above its upper lefthand angle; The subdivisions, though apparently commencing by the divisions of a single plate, still show one edge elevated a little higher than the other, so that the series are in their lateral relations alternate with one another, taken at any point from the commencement of the scapular plates; the subdivisions of the arms from the scapular plates

[Sketch- 1/2 Ichthyocrinus laevis].

can be traced to the number of sixty, and many of these again subdivided and perhaps all, so that the entire number in the living and perfect animal may have been one hundred and twenty.

D. 1.5 H. 1.7 D. of column 0.1

Middle Silurian-Niagara shale.

Lockport N.Y.

Ichthyocrinus Tiaraeformis Hall. Iowa Rep. 1 p 558 (1858) fig 74 =Cyathocrinus tiaraeformis Froost, Mss.

Carboniferous? Whites Creek Springs, Davidson Co. Tennessee.