y\/\/\ SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



DESCRIPTION OF PLATE 61 



PACK 



Asaphiscus ? unispinus Walcott 389 



Fig. I. (X3.) An unusually perfect dorsal shield, partially flattened in 

 shaly limestone. U. S. National Museum, Catalogue No. 

 62775. 

 From locality 3011, Upper Cambrian : Weeks formation ; Weeks 

 Canyon, House Range, Utah. 



Asaphiscus ? granulatus Walcott 385 



Fig. 2. (X 3-) Thorax and pygidium partly crushed in the calcareous 

 shale. U. S. National Museum. Catalogue No. 62776. 

 2a. (X 2.) Nearly entire dorsal shield, which is the type specimen 

 of the species. U. S. National Museum, Catalogue No. 

 62777. 



The specimens represented by figs. 2 and 2a are from locality 3011, 

 Upper Cambrian : Weeks formation ; Weeks Canyon, House Range, 

 Utah. 



Asaphiscus ? minor Walcott 388 



Fig. 3. (X3-) Very perfect dorsal shield. U. S. National Museum, 

 Catalogue No. 62778. 

 3a. (X3-) Interior of a dorsal shield, showing the doublure of the 

 cephalon and pygidium and position of hypostoma. U. S. 

 National Museum, Catalogue No. 62779. 

 3^- (X3-) Group of interiors of the dorsal shield, showing hy- 

 postoma in place. U. S. National Museum, Catalogue No. 

 62780. 



The specimens represented by figs. 3, sa-b, are from locality 3011, 

 Upper Cambrian : Weeks formation ; Weeks Canyon, House Range, 

 Utah. 



Blountia mimula Walcott 399 



Figs. 4, 4'. (X 8.) Dorsal and side views of a dorsal shield without the 

 free cheeks. This is the type of the genus Blountia. U. S. 

 National Museum, Catalogue No. 62781. 

 4a. (X4-) A small pygidium. U. S. National Museum, Catalogue 



No. 62782. 

 4h,4b\ (X 4-) Dorsal and side views of a small cranidium. U. S. 



National Museum, Catalogue No. 62783. 

 4c. (X2.) A free cheek associated with 4b. U. S. National Mu- 

 seum, Catalogue No. 62784. 

 The specimen represented by fig. 4 is from locality 120, Upper 

 Cambrian : Maryville limestone ; 2 to 3 mile^ south of New Market, 

 Jefferson County, and those represented by figs. 4a, 4b, and 4c in same 

 limestone at locality 107c, ii miles northwest of Knoxville, both in 

 ■Tennessee. 



