yo SMITHSONIAN INSTITUTION 



PLATE VII 

 (All figures natural size unless otherwise stated) page 



Scyphocrinus pratteni (McChesney) 50 



Fig. 10. Left anterior interradial view of a maximum specimen with one ray at 

 extreme left preserved to the axillary IIBr; showing the extreme pro- 

 tuberance of the iBr areas, and depression of the radial series ; also the 

 contraction in width of calyx toward the arm-bases. Short pustulose 

 spines, irregularly scattered, are shown. 

 lb. Basal view of same, 1. ant. iR side up. 



Helderbergian. Hardin County, Tennessee. 



Scyphocrinus pyburnensis n. sp 52 



20. Right anterior radial view of the principal type specimen with rays com- 

 plete to the arm-bases, showing general contour of the calyx and 

 character of the unweathered sculpture of the plates ; the radiating 

 costse coalesced into a single large ridge in upper part, producing 

 stellate ornamentation much modified upward by secondary growth. 

 In the matrix above the crinoid may be seen a portion of a Camaro- 

 crinus bulb which was imbedded in the limestone. 



2b. The same specimen from r. post. R, on which the sculpturing appears 

 sharper from weathering, and the action of algse in deepening the pits ; 

 the course of the fixed pinnules can be readily traced. The asymmetry 

 due to the greater distension of the anal interradius is well shown. 



3. Basal view of another specimen, posterior interradius above; showing the 

 slight protuberance of the interbrachial areas, and the numerous con- 

 necting ridges in lower plates. 



Helderbergian. Hardin County, Tennessee. 



Scyphocrinus stellatus (Hall) 49 



4a. Lateral interradial view of distorted calyx with plates below axillary IBr 



wanting, x f . 

 4&. Oblique basal view from another side, showing the relatively narrow and 

 long IIBr as far as the bifurcation. Basal parts restored. X |. 



Helderbergian. Keyser, West Virginia. 



