32 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 98 



DOLICHOMETOPSIS STELLA, n. sp. 



Plate 3, fig. 37 



This species is based on a single incomplete pygidium, which might 

 well belong to some of the described cranidia, but it has been given a 

 name because of its unique construction. Unfortunately the axis is 

 broken away, but it clearly stood well above the convex pleural plat- 

 forms. The pleural lobes rise slightly from the dorsal furrow but 

 drop off rapidly to the border in their outer half. Four pleural 

 furrows are visible, terminating in pits at their distal end. The unique 

 feature of the pygidium is the length of the four marginal spines. 

 The first pair is nearly as long as the pleuron to which it is attached. 

 The remaining pairs increase in size and length rearward until the 

 rear pair possibly equal the length of the pygidium. The surface is 

 covered by small scalelike granulations, which become stronger toward 

 the margins. 



Locality 54s. 



Holotype.— U.S.N.M. No. 98502. 



DOLICHOMETOPSIS ALIA, n. sp. 



Plate 4, figs. 19-21 



This is another well-represented species but only by cranidia. 



The glabella expands forward at about the usual rate. The four 

 pairs of glabellar furrows are faintly indicated but shallow. The neck 

 ring is wide and contracts abruptly to a long, slender spine. The 

 fixigenes at the widest point, which is at the rear end of the eye, 

 exceed half the width of the glabella at the same point. The eyes are 

 of moderate size and set at a considerable angle to the dorsal furrow. 

 They are bowed rather evenly but the curvature is not great. Postero- 

 lateral limbs wider than usual in the genus, with a strong occipital 

 furrow. Fixigenes anterior to the eyes at least four times the width 

 of the brim. Brim confined to a very narrow upturned rim. Surface 

 covered by scattered inconspicuous granules. 



Locality 54s. 



Holotype. — U.S.N.M. No.- 98503; figured specimen, No. 98504. 



DOLICHOMETOPSIS MEDIA, n. sp. 

 Plate 4, figs. 1 1 -12 



This species is founded on a single pygidium. The axis is long and 

 stout and unfortunately is broken off on top as the long spine was 

 carried away by the matrix. Pleural lobes well fused, with four 

 furrows visible, ending in the usual pits inside the border. Four 



