THE LOWER EMBAR OF WYOMING 659 



Leda bellistriata Stevens (PL III, Figs. 9-12) 



1898. Nuculana bellistriata Weller, U.S. Geol. Surv., Bull. 153, pp. 380-81. 



Synonomy to 1898. 

 1900. Nuculana bellistriata Beede, Univ. Geol. Surv. Kan., VI, 148, PI. 20, 



Figs. 14 and 14b. 

 1903. Leda bellistriata Girty, U.S. Geol. Surv., Prof. Paper 63, pp. 442-43. 

 1909. Leda bellistriata Grabau and Shimer, North America Index Fossils, 



"Invertebrates," I, 401. 

 1909. Nuculana bellistriata Beede and Rogers, Univ. Geol. Surv. Kan., IX, 



368, 380, PI. XLII. 



Specimens referred to this species are preserved as internal 

 molds and the identification is uncertain. The shape and size 

 suggest the variety attenluata. The length of the largest specimen 

 is 12 mm., the length in front of the umbones 8 mm., the width 

 7 mm. It is found in the lower phosphate bed from Bull Lake 

 Creek to south of the Little Popo Agie River, ranges from the bot- 

 tom of the Coal Measures to the top of stage G in Kansas, and has 

 been reported from both the Upper and Lower Coal Measures from 

 various states in the Mississippi Valley and eastward. 



Pleurophorus sp. undet. (PI. Ill, Figs. 14 and 15) 



This species is represented by interior molds. It is very small; 

 the length of an average specimen is 7 mm. and the width 4 mm. 

 It resembles P. subcostatus Meek and Worthen, except in size. 

 It is common in the lowest phosphate bed from Bull Lake Creek 

 to the Little Popo Agie River. 



Euphemus carbonarius Cox 



1898. Bellerophon carbonarius Weller, U.S. Geol. Surv., Bull. 153, pp. 139-40. 



Synonomy to 1897. 

 1909. Euphemus carbonarius Beede and Rogers, Univ. Geol. Surv. Kan., IX, 



369, 382. 



1909. Euphemus carbonarius Grabau and Shimer, North America Index 

 Fossils, "Invertebrates," I, 621. 



This species is common in the coquina just below the phosphate, 

 but the preservation has left the surface markings obscure and the 

 identifications are not positive. 



In' the Big Popo Agie Canyon, specimens were collected for two 

 or three miles south of the canyon. It ranges through the Upper 



