926 TRANS. OF THE ACAD. OF SCIENCE. 
dorsum, becoming nearly obsolete before reaching the longitu- 
dinal furrows; lateral lobes rather strongly arched transverse- 
curving slightly downwards, not furrowed; furrows between 
the segments rather deeply impressed, except the two poste- 
rior ones, which are quite shallow. 
Dimensions.—Length of pygidium, .68; greatest width, .76; 
length of axal lobe, .56; greatest width of same, .23. : 
_ Geol. Pos. and Loc.—Collected by Prof. Swallow from the 
! ddle Coal Measures at Lexington, 
. ae Puitursta Masor, Shumard. 
