452 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



DESCRIPTION OF PLATE 65 



PAGE 



Dolichometopus {Housia) varro Walcott 374 



Fig. I. (Natural size.) Broken cranidium. U. S. National Museum, 

 Catalogue No. 62831. 



la.ib. (X 2.) Free cheeks associated with the cranidium fig. i. 

 U. S. National Museum, Catalogue Nos. 62832, 62833. 



ic. (Natural size.) Associated thoracic segment. U. S. National 

 Museum, Catalogue No. 62834. 



id. (X2.) Distorted pygidium. U. S. National Museum, Cata- 

 logue No. 62835. 



le. (Natural size.) Pygidium with the posterior segment of the 

 thorax attached. U. S. National Museum, Catalogue No. 

 62836. 



The specimens represented by figs, i, la-d are from locality 

 3oy (=3ol), Upper Cambrian: Orr formation; on Orr Ridge, 

 about 5 miles south of Marjum Pass, House Range, Millard County, 

 Utah. 



Bathyuriscus {PolicUa) prohus Walcott 354 



Figs. 2,2'. (X 4-) Dorsal and side view of the type cranidium. U. S. 

 National Museum, Catalogue No. 62837. 

 2(7, 2a'. (X S-) Pygidium associated with the cranidium of fig. 2. 

 U. S. National Museum, Catalogue No. 62838. 



The specimens represented by figs. 2, 2a are from locality no, 

 Middle Cambrian: Marjum formation; 4 miles southeast of Ante- 

 lope Springs, House Range, Utah. 



Marjumia callas Walcott 402 



Fig. 3. (X I-5-) Dorsal view and side outline of the type cranidium. 

 U. S. National Museum, Catalogue No. 62839. 

 3«- (X 3-) Free cheek associated with cranidium fig. 3. U. S. 



National Museum. Catalogue No. 62840. 

 Zb. (X3-) Group of three pygidia and one broken cranidium. 

 U. S. National Museum, Catalogue No. 62841. 



The specimens represented by figs. 3, 2>o-h are from locality 3ir, 

 Middle Cambrian: Marjum formation; i mile southeast of Mar- 

 jum Pass, House Range, Utah. 



Marjumia typa Walcott 402 



Fig. 4. (Natural size.) Entire dorsal shield. The type of the species. 

 U. S. National Museum, Catalogue No. 62842. 

 4«- (X3-) Pygidium with test partly exfoliated. U. S. National 

 Museum, Catalogue No. 62843. 



