120 SMITHSONIAN MISCEI.LANKOUS COLLECTIONS VOL. I03 



PLATE 11 



PAGE 



Ellipsoccphaloldcs silvestris, new species 64 



1. Cranidium (X 4)- 



2. Holotype cranidium (X4)- 



3. Two pygidia with which are associated the base of a cranidium and 



a libragene of Ptycliaspis (X4)- (See also pi. 12, fig. 7.) 

 Honey Creek limestone; (loc. 91b) West Timbered Hills, Arbuckle 

 Mountains, Oklahoma. 



EUipsocephaloides satvhackensis , new species 64 



4. Holotype cranidium (XS)- 



5. Large incomplete cranidium (XS)- 



Lyell formation; (loc. 64X) Ranger Brook Canyon, Sawback Range, 

 Alberta. 



Cheilocephalns buttsi, new species 36 



6. Holotype cranidium (X i-5)- 



Ore Hill limestone; (loc. loyv) \ mile northwest of Drab, Pennsylvania. 



EUipsocephaloides cams, new species 65 



7. Cranidium (X S)- 



8. Holotype cranidium (XS)- 



Sabine formation; (loc. 12s) Ram Creek, 15 miles south of Canal Flats, 

 British Columbia. 



EUipsocephaloides montis, new species 65 



9. ID. Dorsal and side views of the holotype cranidium (X2.5). 



11. A small cranidium (XS)- "^ 

 Both are associated with Pseudagnostns. 



Sabine formation; (loc. I2s) Ram Creek, 15 miles south of Canal Flats, 

 British Columbia. 



EUipsocephaloides hearensis, new species 65 



12. Holotype cranidium (X2). 



St. Charles limestone; (loc. 66z) 5 miles west of St. Charles, Bear 

 River Range, Idaho. 



EUipsocephaloides nitela, new species 66 



13. Several cranidia (X4)- (See also pi. 12, figs. 1-3.) 



Honey Creek limestone; (loc. 12m) 7 miles north of Springer, Arbuckle 

 Mountains, Oklahoma. 



EUipsocephaloides butleri, new species 66 



14. 15. Cranidia (X2.5). Upper right cranidium of fig. 14 is the 

 holotype. 



Sawatch formation; (loc. 37x) near Oilman, Mosquito Range, 

 Colorado. 



