454 SMITHSONIAN MISCELLAN'EOUS COLLECTIONS VOL. '64 



DESCRIPTION OF PLATE 66 



PAGE 



Ogygopsis klotci (Rominger) 377 



Fig. I. (Natural size.) Large, nearly perfect, compressed specimen of 

 the dorsal shield. V. S. National Museum, Catalogue No. 

 62846. 

 This figure is the same as that on plate 4, fig. 4, Canadian Alpine 

 Journal [Vol. i, 1908]. 

 la. (Natural size.) Outline of a small specimen illustrating the 

 proportionally smaller pygidium. U. S. National Museum, 

 Catalogue No. 62847. 

 lb. (Natural size.) An hypostoma, associated with figs, i and la. 

 U. S. National Museum, Catalogue No. 62848. 



The specimens represented by figs, i, la-b are from locality 14s, 

 Middle Cambrian : Stephen formation ; Mount Stephen, British 

 Columbia, Canada. 



Orria clcgaus Walcott 381 



Fig. 2. (Natural size.) Dorsal shield and the type specimen of the 

 genus and species. The free cheeks have been restored 

 from other specimens. U. S. National Museum, Catalogue 

 No. 62849. 

 2a, 2a', 2b, 2b'. Natural size and enlarged figures of free ch^ks, 

 associated in the same rock with the specimen represented 

 by fig. 2. U. S. National Museum, Catalogue Nos. 62850, 

 62851. 

 The specimens represented by figs. 2, 2a-b are from locality iiq, 

 Middle Cambrian: Marjum formation; hard calcareous shales, 2.5 

 miles east of Antelope Springs, Millard County, L^tah. 



Lisania ? breviloba Walcott 404 



Figs. 3, 2>ci. (Natural size.) Dorsal and side views of broken crani- 



dium with portions of nine thoracic segments attached. 



This is the type specimen of the species. U. S. National 



Museum, Catalogue No. 62852. 



2,b, 3b'. (X 4-) Dorsal and side views of a small cranidium. 



U. S. National Museum, Catalogue No. 62853. 

 3c, 3c'. (X4-) Dorsal and side views of a small associated pygi- 

 dium enlarged to show the segmentation of the axis and 

 pleural lobes. L^. S. National Museum, Catalogue No. 

 62854. 

 The specimens represented by figs. 3, 3a-c are from locality 11 8a, 

 Upper Cambrian: Maryville limestone: 1.5 miles south of Greene- 

 ville, Greene County, Tennessee. 



