NO. 24 PTARMIGANIA STRATA RESSER 59 



Family Undetermined 



POULSENIA Resser, 1936 



POULSENIA GRANOSA, n. sp. 



Plate 13, figs. 19-30 



This is a very prolific species, represented by many cranidia, a 

 number of pygidia, and one complete specimen that permits unques- 

 tioned assignment of the pygidium. 



The glabella tapers considerably to a rounded front and is strongly 

 marked by three pairs of recurved glabellar furrows. The dorsal 

 furrow is deep, in front joining the equally deep anterior furrow. 

 The fixigenes are rather convex, sharply bent down to the eyes, and 

 crossed by strong eye lines. Longitudinally they also are curved to 

 meet the sharply depressed anterior angles and posterolateral limbs. 

 Brim consists of a narrow preglabellar area, which is almost entirely 

 occupied by the anterior furrow in the middle and a wider rim. The 

 rim is thickened, and in the middle it expands backward. 



The thorax apparently has 23 simple segments. 



The pygidium is short and very wide, and when unexfoliated it is 

 nearly smooth. A wide tapering axis extends nearly to the rear 

 margin. When exfoliated it shows three axial rings, the terminal 

 segment, and about three pleura. On the test only one ring and one 

 pleuron usually are denned. 



Surface, except on pygidium, very granulose. 



Locality 54s. 



Holotype and paratypes.—U.S.'N.M. Nos. 9856oa-g. 



POULSENIA OCCIDENS, n. sp. 



Plate 2, fig. 15 



A single small cranidium differs from P. granosa in having a 

 smooth test. It is nearly completely exfoliated, this feature causing 

 the dorsal and glabellar furrows to be deeper than they would appear 

 on the outer surface. The glabella is rather slender, tapering forward 

 and rounded in front. There are three pairs of deep glabellar furrows. 

 The fixigenes average wider than the glabella and are also convex in 

 cross section. The brim width is about one-third the length of the 

 glabella plus occipital ring. A deep anterior furrow clearly defines 

 a thickened rim which is wider than the preglabellar area. 



Locality 54s. 



Holotype.— U.S.N. M. No. 9856. 



