FOSSILS OF THE WAVRKLY (lUOUP. 263 



tlie i^-lab('ll;i (Miiial to oiu-liall' its widtli at the anterior end, and ronnding 

 inward with a gentle cnrvature to tlie anterior side of the palpebral lobe, 

 the cheek being very narrow at this i)oint, thence passing along the top 

 of the eye to the junction of the ])osterior lateral limb. Surface of the 

 glabella and cheeks smooth, except a few granules near the base of the 

 glabella. 



Movable cheeks of medium size in ])ro})ortion to the glaliella, flattened 

 convex from the base t)f the eve to the narroAv, tliickened, and chamfered 

 marginal rim; occipital furrow narrow, not strongly marked, and reaching 

 nearly to the depression within the marginal rim; posterior angles of the 

 cheeks extending backward in the form of short angular spines. 

 Thoracic segments unknown. 



Pygidium paraboloid in outline, highly convex, abruptly so at the 

 sides and posteriorly. Axial lobe forming- a little less than one-third of the 

 entire width, and reaching nearly to the posterior margin, rounded and 

 strongly elevated throughout; gradually tapering posteriorly and naiTOwly 

 rounded at the extremity; marked by from fifteen to seventeen annulations 

 in different individuals exclusive of the anterior articulating ring. Lateral 

 lobes well marked, very convex, slightly flattened near the axis, Ijut very 

 abrupt at the sides and behind: marked by from fourteen to sixteen very 

 sharply elevated angular ribs, which occupy the entire border, extending 

 beyond the end of the axial lobe, and i-eaching almost to the margin, leaving 

 only a narrow plain space at the edge Tiie surface of the annulations is 

 marked by a series of small nodes, oi- pustules, along their crests, arranged 

 in four longitudinal rows on the axial lings, and an indetiinte number, 

 closely aiTanged, occur on those of the lateral lolies. 



The species in some of its features resembles V. nHtcroccjilKilns Hall of 

 the shales of the Hamilton group of New York, especially in the markings of 

 the pygidium; but it. differs in the more elongate form and nmnlx-r of ribs 

 of this part, while the glabella is ])roportionally narrower and the sides 

 more nearly parallel ; the fixed cheeks and anterior border arc narrower, 

 and the movable cheeks terminate in spines, which is not the case with that 

 one. The surface of the glabella and head is also destitute of the strong 

 pustules which characterize that species. 



