50 SMITHSONIAN MISCELLANFOUS COLLECTIONS VOL. IO3 



KINGSTONIA VULGATA, new species 

 Plate 8, Figures 26-30 



This species is similar to K. promissa, differing in being less convex 

 in every way, and having wider posterolateral limbs. It has normal 

 convexity in both directions, in both the head and tail. 



Sullivan formation; (loc. 64b) Glacier Lake Canyon Valley, 48 

 miles northwest of Lake Louise, Alberta. 



Holotype. — U.S.N.M. No. 108715a; paratypes, Nos. 108715b, c. 



KINGSTONIA LOPERI, new species 



Plate 8, Figures 24, 25 



This species is represented by pygidia from several localities, but 

 a sufficiently well-preserved cranidium to permit unquestioned deter- 

 mination has not been found. These fossils occur in very hard arkosic 

 sandstone and quartzite; consequently not much can be done in the 

 way of preparation. The illustrated specimen shows the quartz grains 

 scattered through the siliceous matrix. Owing to its great length, this 

 pygidium agrees rather well with that of Bymimia, but until positive 

 evidence is available, it is placed in Kingstonia, the genus blonging to 

 the horizon of the Sawatch fauna. 



This pygidium has an elongate triangular shape, with a long, narrow 

 axis clearly defined. Some of the exfoliated specimens, w^hen 

 weathered in a certain way, show the axial rings and the pleural 

 furrows. On the exterior, however, only the anterior furrow and a 

 faintly defined brim are visible. Further segmentation is shown but 

 very faintly by reflection through the test. 



Sawatch formation; (loc. 6a) Taylor Peak, 4 miles south of Ash- 

 croft; (loc. 6) Italian Mountain, 15 miles northeast of Crested Butte, 

 Colorado. 



Holotype.— US. ]^M. No. 1087 14. 



KINGSTONIA (?) PLENA, new species 

 Plate 8, Figukes 31, 2^ 



A single pygidium represents this large and tumid species. Since 

 the pygidium is exfoliated the lateral portions of the dorsal furrow 

 are fairly deep, but it is not traceable around the rear of the axis. 

 The axis rises slightly above the pleural lobes, which slope gently 

 from the dorsal furrow for about half their width, then turn down 

 very rapidly. At the rear the entire pygidium has such great convexity 



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