146 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



PAGE 



Isoteloidcs occidcnialis Walcott 99 



Fig. 26. (Natural size.) Cranidiuni and associated pygidium. U. S. 

 Nat. Mus., Cat. No. 70277- 

 Matrix, limestone. 



Ozarkian, ? Mons formation. (Loc. d/h) : 3 miles (4.8 km.) south 

 of Wilcox Pass, Alberta, Canada. 



Isotcloides ? maladensis Walcott 99 



Fig. 27. (Natural size.) Cranidium and associated pygidium. U. S. 

 Nat. Mus., Cat. No. 70378. 

 Matrix, limestone. 

 Upper Ozarkian ? Near Malad, Idaho. 



