128 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



Specific name given in recognition of Dr. S. J. Schofield of the 

 Geological Survey of Canada, in the southeastern portion of British 

 Columbia. 



Formation and locality. — Ozarkian : (iQn) Mons formation. Swan- 

 sea Mountain, northeast of Windermere, British Columbia, Canada. 



XENOSTEGIUM SHEPHARDI (Raymond) 



Plate 24, figs. 16, 17 



MegaJaspis shephardi Raymond, 1922, Amer. Jourii. Sci., Vol. 3, p. 204 foot- 

 note. 



Observations. — A better preserved specimen than the one available 

 to Raymond is illustrated by figure i6. This species differs from 

 known species of the genus in the length of the portion between the 

 terminus of the axis and base of the longer posterior spine. 



Formation and locality. — Ozarkian : Mons formation. Sinclair 

 Canyon (Raymond's locality). 



(2ih) Sinclair Mountain on Wonah Ridge, one mile (1.6 km.) 

 north of Sinclair Pass. 



(65y) North side of Clearwater Canyon, two miles (3.2 km.) 

 from divide at head of canyon and about 21 miles (33.8 km.) in an 

 air line, 2° west of Lake Louise Station. 



All in British Columbia, Canada. 



XENOSTEGIUM ? SULCATUM, new species 



Plate 24, fig. 9 



Observations. — This cranidium is referred to Xenostegium with 

 reservation because of the more convex, rounded frontal limb. The 

 glabella expands slightly and is defined all around by a dorsal furrow, 

 that makes a very peculiar indentation into the front of the glabella. 

 Glabellar furrows indicated by shallow depressions. A small, rounded 

 boss occurs back of the palpebral lobes. Fixed cheeks very narrow. 

 Free cheek unknown. Surface covered with strong, transverse, 

 irregular lines. 



Formation and locality. — Ozarkian: (55z) St. Charles formation ? 

 Blacksmith Fork Canyon, 10 miles (16 km.) east of Hyrum, Cache 

 County, Utah. 



XENOSTEGIUM TAURUS, new species 



Plate 24, figs. I, 2 



Observations. — This species differs from X. goniocercum mainly 

 in the deeper dorsal furrow in front of the. glabella and the shorter, 



