48 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



DESCRIPTION OF PLATE 4 



Page 



Ncoleniis supcrbus, new species 36 



Fig. I. A nearly entire dorsal shield with the occipital spine broken off. 

 U. S. National Museum, Catalogue No. 53383. 



Figs. 2 and 2a. Hypostoma associated with this species. U. S. National 

 Museum, Catalogue No. 53381. 



Fig. 3. Large compressed cranidium. U. S. National Museum, Cata- 

 logue No. 53384. 



4. Small convex cranidium. U. S. National Museum, Catalogue 



No. 53382. 



5. Portion of a large dorsal shield with well preserved outline of 



the cephalon. U. S. National Museum, Catalogue No. 53380. 



The specimens represented by figures 1-5 are all from thin- 

 bedded Middle Cambrian limestones of the Marjum forma- 

 tion, 2,140 feet (652.3 m.) above the top of the Lower Cam- 

 brian, in ridge on east side of Wheeler Amphitheater, east of 

 Antelope Springs, House Range. Millard County, Utah. 



