354 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



Pacific Railway; (35m) Albertella zone; 3 miles (4.8 km.) south- 

 west of the head of Lake Louise, on east slope of Mount Whyte; 

 (58d) Castle Mountain section, and (sSt) shale, both just below the 

 big cHff on the east shoulder of Castle Mountain, north of Canadian 

 Pacific Railway, all in Alberta, Canada. 



Localities 58k, 576, syr, ^yt, and 58s are also Mount Whyte forma- 

 tion, sHghtly different horizons ; just above the tunnel, north shoulder 

 of Mount Stephen, 3 miles (4.8 km.) east of Field, British Columbia, 

 Canada. 



BATHYURISCUS (POLIELLA) PROBUS, new species 

 Plate 65, figs. 2, 2a 



This species is represented by several cranidia and associated 

 pygidia. The cranidium is much like that of B. haydeni and B. 

 (PoUella) powersi (see pi. 46, figs, i, 2). The associated pygidia 

 differ very materially from both species. The short axial lobe, almost 

 concave margin, and elongate outline suggest reference to Coosia 

 rather than to Bathyuriscus. It is quite probable that the discovery 

 of an entire dorsal shield would result in referring B. {PoUella) 

 probus to a new genus or subgenus. 



Formation and locality. — Middle Cambrian : (11 o) Limestone of 

 Marjum formation about 2,750 feet (838.2 m.) above the Lower 

 Cambrian and 300 feet (92 m.) below the Upper Cambrian," at the 

 base of the limestone forming la of the Marjum formation; about 

 4 miles (6.4 km.) southeast of Antelope Springs in the spur at the 

 junction of the Deseret and Swasey Spring roads, House Range, 

 Millard County, Utah. 



BATHYURISCUS (POLIELLA) SYLLA, new species 



Plate 48, figs. 3, 3a-f 

 This species belongs to that section of the genus Bathyuriscus 

 represented by B. (PoUella) anteros (pi. 46. fig. 5). It has the ex- 

 panded frontal portion of the glabella, falcate termination of the 

 thoracic segments, and relatively small pygidium as compared with 

 that of B. haydeni (pi. 46, figs. 2, 2b). One specimen preserves the 

 pygidium and four thoracic segments, but none shows the entire 

 thorax. The glabella has four pair of furrows ; the two anterior are 



* This distance is given as 1,650 feet (502.9 m.) [Monogr. 51, U. S. Geol. Surv., 

 1912, p. 179], but since that reference was published the Weeks formation has 

 been referred to the Upper Cambrian [Smithsonian Misc. Coll., Vol. 64, 1916, 

 p. 161], which removes 1,390 feet of strata from the Middle Cambrian to the 

 Upper Cambrian in the House Range section. 



