NO. 5 CAMBRIAN TRILOBITES 355 



faint and short and extend obliquely forward, and an occipital spine 

 is indicated by the rising of the center of the occipital ring with a 

 broken spot at the highest point. 



The expansion of the glabella is much like that of B. hozvelli (pi. 

 47,% i)- 



Formation and locality. — Middle Cambrian: (6i o) Chetang for- 

 mation ; gray, shaly limestone in massive beds ; on northeast slope of 

 Chetang Cliffs above Coleman Glacier Creek, 7 miles (11.2 km.) 

 north-northeast in direct line from summit of Robson Peak, northwest 

 of Yellowhead Pass, western Alberta, Canada. 



BATHYURISCUS (POLIELLA), species undetermined (i) 



Plate 46, fig. 7 



This species is represented by two relatively large pygidia that 

 have the general outline of the pygidium of B. {Poliella) primus (pi. 

 46, figs. 6, 6a). The anterior ring of the axial lobe is clearly outlined 

 and carries a median spine with a large base ; the second and third 

 rings do not carry a spine ; the axial rings extend obliquely across 

 the pleural lobes, but they are not marked by pleural furrows. Sur- 

 face of test not preserved. 



Formation and locality. — Lower Cambrian: (35e) Mount Whyte 

 formation ; dark-gray, siliceous shale of the Lakes Louise and x\gnes 

 Cambrian section ; amphitheatre between Popes Peak and Mount 

 Whyte, south of Lake Agnes, south of Laggan, on the Canadian 

 Pacific Railway, in western Alberta, Canada. 



Genus DOLICHOMETOPUS Angelin 



Dolichometopus Angelin, 1852, Pal. Scandinavica, Pt. i, Crustacea forma- 

 tionis transitionis, Lipsise, p. y2. (Genus named and described under 

 family Corynexochidae.) 



Dolichometopus Angelin, 1854, Idem. (Reprint of the preceding.) 



Not Dolichometopus ? Billings, 1865, Pal. Foss., Vol. i, pp. 268-269, 352. 

 (Refers three Canadian species to the genus, none of which belong to it.) 



Dolichometopus Angelin, 1878, Pal. Scandinavica, 3d ed., Holmiae, p. 72. 

 (Reprint of description of 1852 and 1854.) 



Not Dolichometopus Woodward, 1884, Geol. Mag., new ser., Dec. 3, Vol. i, 

 P- 343- (Quotes Angelin's description and adds further details. Species 

 described now referred to Redlichia Cossmann.) 



Dolichometopus Zittel, 1885, Handbuch d. Pal., Vol. 2, Munich, p. 599. 

 (Brief description of genus.) 



Dolichometopus Miller, 18S9, North American Geol. and Pal., p. 545. (Re- 

 peats description, and adds etymology of name as from Gr. dolichos, 

 long, and metope, panel or space between two hollows. Doubts its being 

 an American genus.) 



