PLATE XXI. a 
LINGULELLA (LINGULEPIS) ROWEI (Walcott) (p. 558). 
Ficure 4. Exfoliated ventral valve, the type specimen. U.S. Nat. Mus. Cat. No. 51897a. 
4a, Exfoliated dorsal valve. U.S. Nat. Mus. Cat. No. 51897b. 
4b. Enlargement of the outer surface of another specimen. U.S. Nat. Mus. Cat. No. 51897c. 
The three specimens from which figures 4, 4a—b are drawn are from Locality 14p, Lower Cambrian limestone near 
Resting Springs, Inyo County, California. 
LINGULELLA RANDOMENSIS (Walcott) (p. 530). 
Figure 5. Ventral valve, the type specimen, showing the cast of the area and pedicle groove. U.S. Nat. Mus. Cat. 
No. 35208a. 
5a. Dorsal valve associated with specimen represented by figure 5. U.S. Nat. Mus. Cat. No. 35208b. 
The specimens represented are both from Locality 6y, Upper Cambrian, on the north side of Random Island, be- 
tween Birch and Sandy points, Smith Sound, Trinity Bay, Newfoundland. 
LINGULELLA SCHUCHERTI (Walcott) (p. 530). 
Ficure 6. Cast of a ventral valve, the type specimen, showing the area and pedicle furrow, from Locality 367, Lower 
Cambrian limestone, Troy, Rensselaer County, New York. U.S. Nat. Mus. Cat. No. 51775a. 
