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PALEONTOLOGY OF NEW YORK. 
Thorax elongate, rapidly narrowing. Composed of twelve segments. 
Axis broader than either lateral lobe, broadest at the fourth or fifth 
segment and tapering rapidly to the pygidium. 
Pleum gently deflected at the fulcra, the segments being conspicuously 
sulcate. 
Pygidium imperfectly known, probably very small. 
Surface smooth or minutely granulose. 
Body. Cephalon. Thorax. Pygidium. 
Length_ 11 mm. 3.5 mm. 6.5 mm. 1 mm. ? 
Width_ 7 mm. 7 mm. 6 mm. 2 mm. ? 
Observations. This species approaches Cyphaspis minuscula in the contour 
and outline of the cephalon, but the much greater width of the axis, more 
rapidly tapering margins and longer cheek-spines, will serve as distinguishing 
characters. 
A single imperfect individual retaining the parts in juxtaposition, and show¬ 
ing the lower surface of the test, and a fragment of the cephalon of another, 
are all the specimens known of this rare species, and constitute the only repre¬ 
sentative of the genus in this horizon. 
Distribution. Lower Helderberg group. Near Clarksville, Albany county; 
Schoharie, Schoharie county. 
