328 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



This species is of unusual interest as it is the representative in the 

 Rocky Mountain Cambrian fauna of C. {Bonnia) parvulus of Labra- 

 dor, which is associated with a Lower Cambrian fauna. 



Formation and locality. — Lower Cambrian : (35 1) Mount Whyte 

 formation ; at the base of the formation, on the south slope of Ptar- 

 migan Pass, head of Corral Creek, 9 miles (14.4 km.) north-northeast 

 of Laggan, Alberta; (ssf) Mount Stephen section of Mount Whyte 

 formation; about 300 feet (95 m.) below the top of the Lower 

 Cambrian, in bluish-black and gray limestone (18 feet = 5.5 m.) 

 forming No. 6 of the formation, and (57!) about 175 feet below the 

 top of the Lower Cambrian in brownish-gray quartzitic sandstone 

 (32 feet) forming 4 of Mount Whyte formation, Mount Stephen 

 section, just above the tunnel, north shoulder of Mount Stephen, 3 

 miles (4.8 km.) east of Field, British Columbia; and (ssh) about 

 375 feet (114 m.) below the Middle Cambrian in the shales of No. 4 

 of the Mount Whyte formation,' on Mount Bosworth, north of the 

 Canadian Pacific Railway between Hector and Stephen, on the Conti- 

 nental Divide between British Columbia and Alberta, all in Canada. 



CORYNEXOCHUS (BONNIA) PARVULUS (Billings) 



Plate 57, figs. I, ib-c; plate 64, fig. 6 



Bathytirus parvulus Billings, 1861, Geol. Surv., Canada, Pal. Foss., Vol. i, 

 p. 16. text fig. 21. (Describes and illustrates a cranidium.) 



Bathyurus parvulus Billings, 1862, Geol. Vermont, Vol. 2, p. 953, text fig. 

 361. (Same as above.) 



Bathyurus parvulus Billings, 1862, Rept. Economic Geol. Vermont, Hager, 

 p. 225, text fig. 361. (Same as above.) 



Bathyurus parvulus Billings, 1863, Geol. Canada, Geol. Surv., Canada, p. 

 286, fig. 299 (fig. only.) (Same figure as above.) 



Protypus senectus parvulus Walcott, 1886, Bull. U. S. Geol. Surv., No. 

 30, p. 213. (Considers Billings's Bathyurus parvulus a variety of Pro- 

 typus senectus.) 



Dorypyge parvula Matthew, 1897, Trans. Royal Soc. Canada, 2d ser., Vol. 

 3, Sec. 4, pp. 187, 197, pi. 4, figs. 5, 5a. (Refers species to Dorypyge and 

 describes and illustrates cranidium and associated pygidium.) 



Compare Menocephalus salteri Devine, 1863, Canadian Nat. and Geol., Vol. 

 8, p. 210. (Illustrates and describes this species or one closely related.) 



With the exception of the outline of the glabella, the cranidium of 

 this species is not unlike that of Corynexochus senectus Billings. The 

 glabella, however, is somewhat like that of Dorypyge (pi. 64, figs. 

 7, ya) and Pagodia^ but, as we have learned from many examples, 



Smithsonian Misc. Coll., Vol. 53, 190S, p. 214. 

 'Idem, Vol. 57, 1912. pi. 44, figs. 13, 14. 



