Barycrinus sp. 



Keokuk Limestone. 



Fig. 15. Radial with concave articulating facet, as in Ci/dthorriinis, and trace of transverse 

 ridge indicated hy a low, wrinkled line. 

 16. Radial with well defined ridge not in a straight line, and interru|)tcd at tiic middle. 



EUPACHYCRINUS QUATUORDECEMBRACHIATUS (Lyoil). 



Kaskaskia Group. Grayson Co., Ky. 



P'ig. 17. fully differentiated articulating face of radial, full width of plate; a good example 

 of straight nniscular articulation. Muscular fossae narrow Init distinct; inter- 

 artictdar ligament fos.sae broad and deep; a sharjjly defined intermuscular 

 furrow runs nearly to the transverse ridge, ending in a rounded enlargement 

 perhaps indicating an ob.solete dorsal canal; the transverse ridge is low, sharp, 

 narrow; dorsal ligament fossa long and narrow; ligament pit very narrow. X 2. 



Parisocrinus subramosus (Miller and Gurlcy). 



Keokuk Group. Crawfordsville, Indiana. 



Fig. IS. Posterior view of a very well preserved specimen, showing full length of ventral sac, 

 composed of hexagonal plates perforated by pores at the middle of the sides: 

 For comparison with rotrriorrlmis, having the same anal structure — radianal — 

 but round, concave articulating facets, and no pinnules. 



