52 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



DESCRIPTION OF PLATE 6 



Page 



Neolenus intcnncdius, new species 34 



Fig. I. Cranidium and thorax; natural size. U. S. National Museum, 

 Catalogue No. 53397. 



2. Cranidium; natural size. U. S. National Museum, Catalogue 



No. 53394. 



3. A pygidium with five marginal spines. Compare this pygidium 



with that of Neolenus supcrbus on pi. 4, fig. i. U. S. Na- 

 tional Museum, Catalogue No. 53398. 



4. A pygidium with six marginal spines that is doubtfully referred 



to this species. U. S. National Museum, Catalogue No. 53392. 



5. A small convex cranidium doubtfully referred to this species. 



U. S. National Museum, Catalogue No. 53395- 



6. A small cranidium with a strong occipital node. U. S. National 



Museum. Catalogue No. 53396. 



7. Hypostoma associated with this species. U. S. National Mu- 



seum, Catalogue No. 53393- 



The specimen represented by figure 6 is from thin-bedded 

 Middle Cambrian liijiestones 2,075 feet (632.5 m.) above the 

 Lower Cambrian ; that represented by figure S is from thin- 

 bedded Middle Cambrian limestones 2,140 feet (652.3 m.) 

 above the Lower Cambrian ; and those represented by figures 

 1-4, and 7 are from thin-bedded Middle Cambrian limestones 

 2,300 feet (701m.) above the Lower Cambrian; all in the 

 Marjum formation, in ridge on east side of Wheeler Amphi- 

 theater, east of Antelope Springs, House Range, Millard 

 County, Utah. 



Neolenus iittcniicdiiis piigio, new variety 35 



Fig. 8. Fragment of a large dorsal shield with missing parts restored in 

 outline. U. S. National Museum, Catalogue No. 53400. 

 9. A broken pygidium. U. S. National Museum, Catalogue No. 

 53401. 



The specimens represented by figures 8 and 9 are from thin- 

 bedded Middle Cambrian limestones of the Marjum forma- 

 tion, 2.300 feet (701 m.) above the Lower Cambrian, in ridge 

 on east side of Wheeler Amphitheater, east of Antelope 

 Springs, House Range, Millard County, Utah. 



