336 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



Wasatch Canyon, east of Lakeview Ranch, Boxelder County ; and 



(30a) shale on north side of Big Cottonwood Canyon, i mile (1.6 



km.) below Argenta, in the Wasatch Mountains southeast of Salt 

 Lake City, Salt Lake County, both in Utah. 



BATHYURISCUS ATOSSA. new species 

 Plate 48, figs. 2, 2a-b 



In size and general characters this species at once suggests B. anax 

 (pi. 48, fig. i) and B. rotundatus (pi. 47, fig. 2a). The three species 

 also occur at about the same horizon in the Middle Cambrian section. 

 Bathyuriscus atossa differs from B. anax in having one more thoracic 

 segment (9), a shorter palpebral lobe and relatively narrower axial 

 lobe both in thorax and pygidium. 



From B. rotundatus it differs in having a relatively narrower 

 median axis in thorax and pygidium, and the axial lobe is shorter in 

 the pygidium. The tubercle at the inner end of the pleural furrow is 

 also stronger than in the other species mentioned. I identified this 

 species with B. rotundatus in my field notes, but a closer comparison 

 seems to indicate that although closely allied they differ in detail 

 sufficiently to distinguish them as distinct species. 



Formation and locality. — Middle Cambrian: (55c) Spence shale 

 member of the Ute formation; about 50 feet (15.2 m.) above the 

 Brigham quartzite, and 2,755 feet (839.7 m.) below the Upper Cam- 

 brian, in a ravine running up into Danish Flat from Mill Canyon, 

 about 6 milgs (9.6 km.) west-southwest of Liberty and 15 miles (24.2 

 km.) west of Montpelier, Bear Lake County, Idaho. 



BATHYURISCUS BANTIUS, new species 

 Plate 49, figs. 2, 2a-c 



This species is represented by only the cranidia and associated 

 pygidia as casts in a shaly sandstone of the Rome formation. The 

 cranidia vary in outline, especially in the glabella, owing mainly to 

 distortion caused by compression and some lateral motion in the 

 sandy matrix. The one illustrated (fig. 2) has a length of 9 mm. 

 and it appears to have nearly its original form and convexity. The 

 glabella is marked by the usual oblique posterior pair of furrows and 

 three shorter pairs, the anterior of which slope a little forward from 

 the dorsal furrow, beside the glabella. The eye lobes are much like 

 those of B. haydeni. The associated pygidia have from 6 to 7 



