188 PROOEEDINOfi OF THE XATTONAL MUSEUM. vol.41. 



These are both large species, from the typical Keokuk or passage 

 beds from the Burlington; they are found in place in the Keokuk 

 beds at the top of the hills at Whites Creek, but are not found at the 

 Knobs. 



4. E. cf. matuta. A small species occurring in the Lower Burling- 

 ton; several good specimens at Whites Creek. 



LOBOCRINUS Waehsmuth and Springer. 



L. TiasTivillae Hall, is another typical Keokuk and Upper Burlington 

 species, found in the Mississippi River region, and in Barren and 

 Metcalfe counties, Kentucky. It occurs in the Keokuk beds at 

 Whites Creek, where it was found in place, but not at the Knobs in 

 Bullitt County. It is reported from one locality in Marion County, 

 where it probably came from the limestone beds at the top. 



L. robusius Waehsmuth and Sprmger. Described from Whites 

 Creek; found in the upper Keokuk beds, and not found at the Knobs. 



DORTCRINUS Roemer. 



J), gouldi Hall. Typical Keokuk species of Iowa; is found at 

 Whites Creek, but not at Button-mould Knob. 



AGARICOCRINUS Hall. 



A. americanus Roemer. 



A. nodulosusMeek and Worthen; both typical Keokuk species; are 

 abundant in the Keokuk beds at the top of the hills at Whites Creek 

 but not found at the Knobs. There are fragments of large Agaricocri- 

 nus at Button-mould, unidentifiable, and a small form, with ten arms, 

 that might be a Burlington or Keokuk species. 



MEGISTOCRINUS Owen and Shumard. 



Fragments of large stems, clearly belonging to tliis genus, are found 

 at Button-mould and Bradbury Knobs, but have not been noted at 

 Whites Creek. It is a Devonian genus, becoming extinct with the 

 Burlington. 



AMPHORACRINUS Austin. 



Spinous tegmen plates belonging to this genus occur at Button- 

 mould and Bradbury Knobs, Whites Creek, and at Fern Glen, 

 Missouri. This is essentially a Choteau-Lower Burlington genus, 

 ending with the latter horizon, where it is represented by two fine 

 species. Species have been described from the Kinderhook of 

 Jersey County, Illinois, the Choteau of Sedalia, Missouri, and the 

 Waverly of Richfield, Ohio; and it occurs at Lake Valley, New 

 Mexico. It is also one of the leading crinoids of the Mountain 

 Limestone of England. It is emphatically a pre-Keokuk genus, 

 and did not so far as known even enter the Upper Burlington. 



