493 Systematic Paleontology 



separated by moderately broad sulci. Pleuras evenly rounding to the 

 flattened border, and bearing seven annulations, vphich are strongly sulcate. 

 Border broad, depressed or flat. All the pleural annulations pass over the 

 border to its edge, where the anterior and posterior limbs are of equal 

 strength. Doublure broad. 



" The cephalon shows traces of low pustules over the glabella, and upon 

 the depressed frontal area, where they become elongate or lachrymate, 

 sometimes anastomosing, leaving elongate depressions between them ; the 

 frontal border also bears an irregular row of conspicuous tubercles. The 

 pygidium is marked by regularly arranged pustules; a median row upon 

 the axis, bifurcating at the fifth or sixth annulation, thence backward 

 continuing double until it becomes obsolete. Four rows of finer pustules 

 are also visible on the axis, two on either side of the median row. The 

 pleurae bear three or four rows of small pustules, and the interspaces of 

 the crust are minutely granulose, and punctate. The lower surface of the 

 doublure is marked by faint radiating or venate striations." Hall and 

 Clarke, 1888. 



This species, as it occurs in Maryland, differs somewhat from Hall and 

 Clarke's types in that the former have a somewhat longer glabella and the 

 position of a single pair of side furrows is merely indicated by a pair of 

 depressions on the sides of the glabella. 



Occurrence. — Helderberg Formation, ISTevv^ Scotland ( ?) Member. 

 Cumberland. 



Collection. — George M. Boeder. 



[Ohern.] 

 Genus CYATHASPIS Burmeister 



Cyathaspis australis n. sp. 



Plate LXXXIX, Figs. 7, 8 



Description. — Cephalon. Semielliptical transversely; length to width 

 about as 1 to 2; genal angles (imperfect in only specimen seen) pro- 

 duced, diverging posteriorly ; border smooth, thickened, a broad well- 

 defined sulcus lying concentrically within the thickened border and ex- 

 tending from base to base of the genal angles. Facial sutures originat- 



