ering. 
Dimensions .—Length, 0.20 of an inch ; width, 0.18. r 
The Elceacrinus 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. 
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