PALEONTOLOGY OF NEW YORK. 



Glabella depressed-convex, slightly flattened above and posteriorly elevated 

 on the axial line; long, conate, extending to the frontal border. Width at 

 the base mentor than one-third the width of the shield. Lateral furrows 

 obscure, but indications of three pairs may be observed. Occipital lobes 

 comparatively large ; occipital furrow narrow, bifurcating near the axial fur- 

 rows to include the occipital lobes, and becoming very deep upon the cheeks ; 

 occipital ring broad and flat. 



Clinks convex, depressed about the base of the eyes, thence somewhat 

 abruptly deflected to the marginal sulcus and occipital furrow. 



Eyes comparatively small, approximate, attaining the elevation of the 

 glabella. Palpebrum small; palpebral lobes depressed, obscure; palpebral 

 sulcus shallow. 



Thorax sub-quadrate, length to width as 2 to 3 ; margins nearly parallel ; sur- 

 face equally trilobate. 



Axis evenly arched, widest at the fourth segment and tapering thence 

 regularly backward. Segments flattened, transverse. 



Pleura flat for one-half their width and thence deflected in a moderately 

 sharp curve to the margin. Each segment is grooved for two-thirds its length, 

 and 1 leveled upon the outer third by the articulating plane. 



Pvgidiom parabolic in outline, length to width as 3 to 5; evenly convex; bor- 

 der broad, flat or slightly sloping. 



Axis prominent and evenly tapering to an abrupt and somewhat elevated 

 termination just within the posterior border, with which it is connected by a 

 low ridge. Indications of seven or eight transverse annulations appear on 

 the axis, exclusive of the articulating ring, which is more conspicuous than 

 any of the others. 



Pleura evenly sloping to the lateral and posterior margins. Articulating 

 ring very conspicuous; annulations obscure, almost obsolete. Four are visible 

 in favorably preserved specimens, and all are depressed above and faintly 

 grooved. 



