NO. 24 PTARMIGANIA STRATA RESSER 33 



marginal spines increasing in size from the front to the rear are 

 present. The surface is granulose, with the granules of moderate size 

 and fairly crowded on the higher portions. 



Locality 54s. 



Holotype.— U.S.N.M. No. 98505. 



DOLICHOMETOPSIS COMIS, n.sp. 



Plate 4, figs. 22-24 



This species is represented by several cranidia, and a pygidinm 

 assigned to it. The glabella expands very slightly and is definitely 

 keeled, which feature extends into the occipital spine. It is further 

 characterized by the failure of the occipital furrow to be deeply 

 impressed across 'the median line. The palpebral lobes attain their 

 greatest width opposite the first pair of glabellar furrows and this 

 width is more than half the glabellar width at the same point. The 

 eyes are evenly bowed and considerably curved, and anterior to the 

 eye lines form rather wide flanges. Rim narrow. The pygidium is 

 characterized by a long, stout axis. The first axial ring is thickened 

 and bears the usual long spine. Back of this, three other rings are 

 traceable. On the pleural lobes only three ribs are noticeable, with 

 the furrows terminating in pits as usual. The third pair of marginal 

 spines is apparently reduced, while the fourth is rather large. Sur- 

 face characterized by scattered granules and irregular ridges, both of 

 which are faint. 



Locality 54s. 



Holotype and paratype. — U.S.N.M. Nos. 98506a, b. 



DOLICHOMETOPSIS POULSENI, n. sp. 



Plate 5, figs. 1-10 



This species gives a clue to the association of cranidium and 

 pygidium. It also serves for correlation between the Wasatch 

 Mountains and Liberty Canyon in the Bear River Range. Unfor- 

 tunately the specimens are fragmentary and the material is not 

 abundant. Further collection at the locality should yield excellent 

 specimens. 



This is a large species in which the long glabella is practically 

 parallel-sided. The usual furrows are visible, although broad and 

 shallow. The occipital ring is exceptionally wide and extends into a 

 long, erect spine. The fixigenes at their widest points are about half 

 of the glabellar width. The eyes are long and fairly evenly bowed 



