658 E. B. BRANSON 



Nucula perumbonata White (PI. Ill, Figs. 18-19) 



1879. Nucula perumbonata White, Bull. U.S. Geol. and Geog. Surv. Terr., 

 V, 217. 



1880. Nucula perumbonata White, Cont. to Inv. Pal., No. 6, p. 136, PI. 34, 

 Figs. 7a-b. 



The type came from Wild Band Pockets, in northern Arizona, 

 15 miles southward from Pipe Springs, in the Carboniferous, near 

 the top. 



The Embar specimens are abundant, but only two good ones 

 were collected, and they came from the coquina just below the 

 phosphate. The surface markings are not well preserved, but seem 

 to be exactly like those of the type. The Embar specimens come 

 from the Big Popo Agie region, S.W. \ S. 16, T. 32 N., R. 100 W. 



Nucula pulchella Beede and Rodgers (PI. Ill, Figs. 7-8) 



1899. Nucula pulchella Beede and Rodgers, Kan. Univ. Quart., VIII, 132, 

 PL XXXIV, Figs. sa-c. 



1900. Nucula pulchella Beede and Rodgers, Univ. Geol. Surv. Kan., VI, 151, 

 PL XXI, Figs. 5a-c. 



1909. Nucula pulchella Beede and Rodgers, Univ. Geol. Surv. Kan., IX, 

 368, 380, PL XLII. 



This species is represented as interior molds, which agree in 

 shape and size with N. pulchella, but the reference is uncertain. 

 They are found in the lower phosphate bed in Big Popo Agie 

 Canyon, Little Popo Agie Canyon, and Bull Lake Creek Canyon, 

 Wyoming, and in the Kickapoo limestone about the middle of /the 

 Missouri group of Kansas. 



Nucula sp. (PL III, Figs. 20-21) 



This is one of the most abundant forms occurring in the lower 

 phosphate bed, but the specimens are all interior molds. They 

 agree in shape and size with the forms which Meek found at 

 Nebraska City and which he identified provisionally with Nucula 

 beyrichi. 1 They also agree in shape and size with Girty's 2 Nucula 

 sp. a. from the Guadalupian. 



1 Meek, Paleontology of Eastern Nebraska, p. 203, PI. 10, Figs. 18 and iga-b. 



2 Girty, Prof. Paper 58, p. 421, PI. XXIV, Fig. 22. 



