PLATE LV. 181 
OBOLELLA ? LINDsTROMI Walcott (p. 596). 
Figure 4. Exterior of a ventral valve, the type specimen, from Locality 321v, Lower Cambrian sandstone at 
Bjorkelunda, Province of Christianstad, Sweden. The specimen from which this figure was drawn 
can not be located. A record of the locality was, however, preserved. 
4a. Cast of the interior of dorsal valve, from Locality 321s, Lower Cambrian sandstone at Sularp, near Lund, 
Province of Malméhus, Sweden. U.S. Nat. Mus. Cat. No. 35263a. 
OBOLELLA CRASSA ELONGATA Walcott (p. 595). 
» 
Ficure 5. Ventral valve, the type specimen from Locality 319b, Lower Cambrian limestone at St. Simon, Quebec, 
Canada. U.S. Nat. Mus. Cat. No. 14691a. 
5a. Dorsal valve associated with specimen represented by figure 5. U.S. Nat. Mus. Cat. No. 14691b. 
OBOLELLA AsIATIcA Walcott (p. 588). 
Fiaure 6. Exterior of ventral valve, the type specimen. U.S. Nat. Mus. Cat. No. 52525a. 
6a. Exterior of dorsal valve. U.S. Nat. Mus. Cat. No. 52525b. 
The specimens represented are both from Locality ¢32’, Lower Cambrian limestone bowlder 1 mile south of 
Chonpinghien, on Nankiang River, Shensi, China. 
OBOLELLA WIRRIALPENSIS Etheridge (p. 599). 
Ficures 7 and 7’. Top and side views of ventral valve. University of Adelaide, South Australia. 
7a. Exterior of dorsal valve marked by strong concentric ridges. U.S. Nat. Mus. Cat. No. 51963a. 
7b. Dorsal valve. University of Adelaide, South Australia. Type specimen, figured by Etheridge [1905, 
Pl. XXV, fig. 2]. 
The specimens represented by figures 7, 7a-b are all from Locality 315d, Lower? Cambrian limestone near 
Wirrialpa, Flinders Range, South Australia. 
