62 SMITHSONIAN INSTITUTION 



PLATE III PAGE 



Scyphocrinus elegans Zenker 30 



Fig. 1. Specimen A, from the slab on PI. I. A nearly complete crown with calyx 

 about 10 cm. high, and arms to about 25 cm. in length; part of base 

 and proximal columnals in outline. Calyx but little flattened, and show- 

 ing about the normal contour ; interradial view. Interbrachial pavement 

 has the stellate type of sculpturing produced by progressive coalescence 

 of the slits crossing the sides of the plates ; these disappear in the upper 

 part where the surface becomes nearly smooth ; this is not due to any 

 erosion in the fossil state, as these parts were covered with a fine 

 calcareous mud which was carefully removed with delicate tools and 

 water. From the calculated taper of the arms to the highest part 

 visible, it is probable that they were at least twice as long as here 

 preserved. Reduced to|. 



2. Detail from specimen F (PI. I), with the smooth type of interbrachial pave- 



ment. Natural size. 



3. Detail from specimen E, interradial view, showing interbrachial pavement 



with slits crossing margins of plates at the sides in lower part, and 

 depressions at angles in upper, producing both stellate and reticulate 

 sculpture (var. typica). Natural size. 



4. Detail from specimen G, upper part of interbrachial pavement, showing 



depressed areas at corners of plates disconnected in one area, and con- 

 nected in the other, producing reticulate (var. typica) and banded (var. 

 schlotheimi) sculpture in the same specimen. Natural size. 



Helderbergian. Cape Girardeau, Missouri. 



Glyptocrinus dyeri Hall 35 



(For comparison of fixed pinnules) 



5a. R. ant. iR view of calyx, showing the fixed pinnules on IIBr 2-4-5-6-7, 



their course marked by sharp median ridges. Natural size. 

 5b. Tegmen of same, showing probable nature of the Scyphocrinus tegmen. 

 The fixed pinnules are seen curving upon and merging into the tegmen. 

 Anal series in strong median ridge also merging into the tegmen. The 

 lower part of the tegmen is distorted by an imbedded stem frag- 

 ment. X I . 



This figure should be compared with PI. IV, fig. 1. 



Ordovician. Cincinnati, Ohio. 



