12) by NAN) IEP OO: QYA 293 
BILLINGSELLA LINDSTROMI (Linnarsson) (p. 757). 
Fieure 6. Exterior and side views of nearly entire ventral valve from Locality 320n, Middle Cambrian limestones of 
the Paradoxides forchhammeri zone at Lovened, Djupadal, 19 miles (30.6 km.) south-southeast of 
Skara, Province of Skaraborg, Sweden. U.S. Nat. Mus. Cat. No. 52260a. 
6a and 6b. Exterior views of ventral and dorsal valves with coarse costae. U.S. Nat. Mus. Cat. Nos. 52259a 
and 52259b, respectively. 
6c and 6d. Exterior and side views of dorsal valves. U.S. Nat. Mus. Cat. Nos. 52259c and 52259d, respec- 
tively. 
6e. Cast of the interior of a ventral valve. U.S. Nat. Mus. Cat. No. 52259e. 
6f. Cast of the interior of a dorsal valve. U.S. Nat. Mus. Cat. No. 52259f. The beak is added from another 
specimen (Cat. No. 52259¢). 
The specimens represented by figures 6a-f are all from Locality 320g, Middle Cambrian limestones of the 
Paradoxides forchhammeri zone at Alunbruk (alum works), southern part of Oeland Island, Sweden. 
WIMANELLA SAFFORDI (Walcott) (p. 747). 
Fiaure 7. Cast of interior of a ventral valve, the type specimen. U.S. Nat. Mus. Cat. No. 52268a. 
7a. Cast of interior of a dorsal valve. U.S. Nat. Mus. Cat. No. 52268b. 
The specimens represented are both from Locality 14a, Middle Cambrian sandstone of the Rome formation along 
First Creek Gap, 4 miles (6.4 km.) north-northé¢ast of Knoxville [Keith 1905, areal geology sheet], Knox County, 
Tennessee. 
