346 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



outlined on the pleural lobes by furrows that progressively curve 

 more and more backward from the first to the posterior one, which 

 adjoins the terminal segment ; the furrows all terminate within the 

 narrow, slightly flattened border. 



The casts of the outer surface indicate that it was smooth or 

 minutely granulose. 



This species appears to be quite distinct from any that has been 

 described. The quadrangular glabella with nearly parallel sides dis- 

 tinguishes it from Bathyitriscus howelli Walcott. 



Formation and locality. — Middle Cambrian: (35 o, 365, 36h) Fu- 

 chou series, shales about 130 feet (40 m.) above the white quartzite ; 

 collected near a low bluff on the shore of Tschang-hsing-tau Island, 

 east of Niang-niang-kung, Liau-tung, Manchuria, China." 



Collected by J. P. Iddings and Li San. 



BATHYURISCUS ORNATUS Walcott 

 Plate 46, figs. 4, 4a-b 



Bathyuriscus ornatus Walcott, 1908, Smithsonian Misc. Coll., Vol. 53, 

 P- 39, pl- I, figs. 1-3. (Describes and illustrates species.) 



Bathyuriscus ornatus Walcott, 1908, Canadian Alpine Jour., Vol. i. No. 2, 

 pl. 3, fig. 3. (Republishes fig. i of previous paper.) 



This form was described in detail in 1908. It is so strongly marked 

 by the triangular tubercle in the thoracic pleural furrow and by the 

 absence of genal spines that there is little chance of its being mistaken 

 for any other known species of the genus. 



Formation and locality. — Middle Cambrian: (14s) 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, British 

 Columbia, Canada. 



BATHYURISCUS ROTUNDATUS (Rominger) 



Plate 47, figs. 2, 2a -b 



Embolimus rotundata Rominger, 1887, Proc. Acad. Nat. Sci. Phil., p. 16, pl. i, 



figs. 4, 5. (Describes and illustrates species.) 

 Bathyuriscus howelli Walcott, 1888, Amedcan Jour. Sci., 3d ser., Vol. 36, 



p. 165. (Considers Embolimus rotundatus Rominger as identical with 



Bathyuriscus howelli.) 



* For general section giving stratigr|iphic relations, see Blackwelder, Re- 

 search in China, Vol. i, Pt. i, 1907, p. 92. 



