Dimensions.— Length, 0.20 of an inch ; width, 0.18. 
The Elcmcrinus Kirhwoodensis is nearly allied to JE. 
( Pentremites) melo, from which it is distinguished by its 
much smaller size and less deeply excavated base. It also 
occupies a higher geological position. 
Occurs in the St. Louis Limestone (Carboniferous) on the 
Pacific railroad near Kirkwood, St. Louis county, Missouri. 
