PLATE V. 40 
KurorGina PERUGATA Walcott—Continued. 
Ficure 3b. Exterior, side, and back views of a dorsal valve. The pseudo-area is broken away. U.S. Nat. Mus. 
Cat. No. 51511c. 
3c. Top, back, and side views of an exfoliated dorsal valve, the type specimen, showing pseudo-area. U.S. 
Nat. Mus. Cat. No, 51511d. 
3d. Exterior of dorsal valve illustrating variation in the concentric corrugations. U.S. Nat. Mus. Cat. No. 
5151 le. 
3e. Small, strongly corrugated ventral valve, drawn from the cast of a natural mold. U.S. Nat. Mus. Cat. 
No. 51511. 
The specimens represented are all from Locality 1v, Lower Cambrian, Silver Peak quadrangle (U. 8. Geol. Sur- 
vey), Nevada. 
KurorGIna SARDINIAENSIS Walcott (p. 584). 
Figure 4. Ventral valve, the type specimen, from Locality 354e, Middle ? Cambrian, Sardinia. Copied from Borne- 
mann [1891, Pl. XIX, fig. 21], who describes and figures the specimen as Lingula roualti. 
4a. Exterior of ventral valve from Locality 354e, Middle? Cambrian shale at Porto Canal Grande, Sardinia. 
U.S. Nat. Mus. Cat. No. 18301a. 
4b and 4c. Exteriors of dorsal valves from Locality 354e, Middle ? Cambrian, Sardinia. Copied from Borne- 
mann [1891, Pl. XIX, figs. 22 and 23, respectively], who describes and figures them as Kutorgina 
cingulata. 
KKXUTORGINA GRANULATA Matthew (p. 582). 
Ficures 5 and 5a. Top and side views of a broken ventral valve. Type specimen figured by Matthew [1899a, 
Pl. I, fig. 2a]; it is redrawn on this plate. 
5b. Partly exfoliated interior of a dorsal valve. Specimen figured by Matthew [1899a, Pl. I, fig. 2c]; it is 
redrawn on this plate. 
5c. Partly exfoliated exterior of a dorsal valve. Specimen figured by Matthew [1899a, PI. I, fig. 2b]; it is 
redrawn on this plate. 
The specimens represented are all from Locality 314b, Lower Cambrian limestone, Smith Sound, Newfoundland, 
and are in the collection of the University of Toronto, Canada. 
