44 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



DESCRIPTION OF PLATE 2 



Page 



Albertella hclcna, new genus and new species 19 



Fig. I. A nearly entire dorsal shield. U. S. National Museum, Cata- 

 logue No. 53410. 



2. A pygidium retaining much of its natural form. The outer test 



is exfoliated about the margins. U. S. National Museum, 

 Catalogue No. 53411. 



3. A very small dorsal shield. U. S. National Museum, Catalogue 



No. 53409. 



4. A large, broken dorsal shield. U. S. National Museum, Cata- 



logue No. 53407- 



5. A large cranidium. U. S. National JMuseum, Catalogue No. 

 ) 53408. 



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



seum, Catalogue No. 53414. 



7. A pygidium which compare with the pygidium of A. bosivorthi 



on pi. I, fig. 6. U. S. National Museum, Catalogue No. 53403. 



8. A broken dorsal shield, broadened by compression. U. S. Na- 



tional Museum, Catalogue No. 53402. 



9. A small dorsal shield. U. S. National Museum, Catalogue No. 



53404- 



The specimens represented by figures 1-5 are from Lower 

 Cambrian shales on Gordon Creek, Ovando Quadrangle, Powell 

 County, Montana, and those represented by figures 6-9 are 

 from a drift block of Lower Cambrian shales found on the 

 slopes of Mt. Bosworth, just north of the Canadian Pacific 

 Railway, one mile (0.62 km.) east of Hector, British Columbia. 



