PLATE I. 



Page 



Fig. 1. A long stem with a finely preserved Root, probably belonging to Poterlocrlnus. 



From the Burlington Limestone 44 



2. Stem with enormous Cirri, probably of Butocrinus (jv<uuHs, with large cysts 



on two of the cirri. From the Keokuk group at Crawfordsvillo .... 43 



3. Stem fragment from the Upper Devonian of Kentucky, with five rows of 



large cirri, longitudinally arranged 43 



4. Terminal end of a Stem, apparently of Burycrinus, attached by a flat surface. 



From the Lower Burlington Limestone. 

 a. Profile view of the same. 

 /;. Surface of attachment of same, showing open grooves passing out from the 



axial canal of the stem 46 



5. Terminal end of Stem of Banjcr'uius, showing the large asteriform canal of 



stem, and the linear canal of the cirri 46 



6. The quinquepartita Stem of a Barijcr'inus, somewhat weathered, showing the 



longitudinal divisions, and two series of pores to each segment .... 46 



7. Terminal end of Stem of Barycrinus, showing the large axial canal, with the 



laminated structures 46 



8(;, h. Sections of stem fragments of Barycrinus, showing slits and pores through 



the walls 46 



9, 10. Dorso-central Plates, supposed to belong to a species of Heterocrinus. 



From the Hudson River group at Cincinnati 49, 51 



(All specimens are in the collection of Wachsmuth and Springer.) 



