324 SMITHSONIAN IMISCELLANEOUS COLLECTIONS VOL. 57 



DESCRIPTION OF PLATE 53 



PAGE 



Callavia eucharis Walcott 315 



Fig. I. (X 2.) Type specimen of the species. (Locality 6ik.) U. S. 

 National Aluseum. Catalogue No. 60079. 



JVauiieria occidcns Walcott 314 



Fig. 2. (Natural size.) Type specimen of the cephalon of the species. 

 (Locality 6ik.) U. S. National Museum, Catalogue No. 

 60080. 



Callavia perfecta Walcott 315 



Fig. 3. (X 2.) Type specimen of the species. (Locality 6ik.) U. S. 

 National Museum, Catalogue No. 60081. 



4. (Natural size.) Specimens of the cephalon found in a parting 



of the shale. (Locality 6ik.) LI. S. National Museum, 

 Catalogue No. 60082. 



5. (Natural size.) A large cephalon flattened in the shale. 



(Locality 6ik.) \]. S. National Museum, Catalogue No. 

 60083. 

 The specimens represented here by figs. 1-5 are from locality 6ik. 

 Lower Cambrian : Mahto formation ; dark, hard siliceous shale, 

 northeast base of Mumm Peak above Mural Glacier on the west side 

 of Hitka Pass, 6 miles (9.6 km.) in a direct line north of summit of 

 Robson Peak and northwest of Yellowhead Pass, in western Alberta, 

 Canada. 



