414 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



DESCRIPTION OF PLATE 46 



PAGE 



Bathyuriscus (Policlla) pozvcrsi Walcott 35i 



Fig. I. (X2.) Type specimen of dorsal shield exclusive of free 

 cheeks. Original specimen in collections Museum of Com- 

 parative Zoology, Cambridge, Massachusetts. Plastotype 

 U. S. National Museum, Catalogue No. 62620. 



The original specimen vi^as collected from the Gallatin limestone, 

 Pole Creek, Gallatin County, Montana. 



Bathyuriscus haydeni ( Meek) 34^ 



Fig. 2. (X I-5-) Photograph of the best specimen used by Meek in 

 describing species. Note the large pygidium. U. S. Na- 

 tional Museum, Catalogue No. 7863. 

 2a. (X2.) Cast of a cranidium. U. S. National Museum, Cata- 

 logue No. 7863. 

 2b. (X2.) Pygidium. U. S. National Museum, Catalogue No. 

 7863. 

 The specimens represented by figs. 2, 2a and 2b are weathered out 

 on surface of dark, thin-bedded limestone at locality 302, Middle 

 Cambrian : Limestone east of West Gallatin River, above Gallatin 

 City, Gallatin County, Montana. 



Bathyuriscus (Poliella) occidentalis (Matthew) 35i 



Fig. 3. (X2.5.) Illustration from plaster cast made in matrix which 

 is the type specimen of the species. Plastotype U. S. Na- 

 tional Museum, Catalogue No. 62621. The specimen is from 

 locality 14s, Middle Cambrian: Ogygopsis zone of the 

 Stephen formation; about 2,300 feet (701 m.) above the 

 Lower Cambrian and 2,700 feet (823 m.) below the Upper 

 Cambrian in the Ogygopsis zone of the Stephen formation, 

 at the great " fossil bed " on the northwest slope of Mount 

 Stephen, above Field on the Canadian Pacific Railroad, Brit- 

 ish Columbia, Canada. 

 This figure is the same as that on plate 3, fig. 2, Canadian Alpine 

 Journal, Vol. i, No. 2, 1908. 



Bathyuriscus ornatus Walcott 34^ 



Fig. 4. (X2.) A broken specimen, showing character of cephalon 

 and thorax. U. S. National Museum, Catalogue No. 53420. 

 40- (X3-) Two segments of the thorax enlarged to show the 

 details of the axial and pleural lobes. U. S. National 

 Museum, Catalogue No. 53423- 

 4b. (X2.25.) A small, nearly entire dorsal shield, with the excep- 

 tion of the free cheeks. U. S. National Museum. Cata- 

 logue No. 53421. 

 These figures are the same as those on plate i, figs, i, 3, 2, respec- 

 tively, Smithsonian Miscellaneous Collections, Vol. 53. 1908; and 4 

 is also used on plate 3, fig. 3, Canadian Alpine Jour., Vol. i, No. 2, 

 1908. 



The specimens are from locality 14s, Middle Cambrian: Ogy- 

 gopsis zone of the Stephen formation, at the great "fossil bed " on 

 the northwest slope of Mount Stephen, above Field on the Canadian 

 Pacific Railroad, British Columliia, Canada. 



