PLATE III. 15 
MiIcROMITRA SCULPTILIS (Meek)—Continued. 
Fieure 5d. Crushed ventral valve from Locality 8i, Middle Cambrian shaly Marjum limestone near Antelope Springs, 
House Range, Utah. U.S. Nat. Mus. Cat. No. 51494a. 
5e. A portion of the surface of the specimen represented by figure 5a, greatly enlarged. U.S. Nat. Mus. 
Cat. No. 35212a. 
Mrcromirra (IPpHIDELLA) ORNATELLA (Linnarsson) (p. 360). 
Fiaures 6, 6a, and 6b. Apical, side, and posterior views of a typical specimen from Locality 320f, Middle Cambrian 
limestone at Andrarum, Sweden. U.S. Nat. Mus. Cat. No. 26667a. 
6c. Dorsal valve from Locality 8w, Middle Cambrian limestone near Andrarum, Sweden. U.S. Nat. Mus. 
Cat. No. 51460a. : 
6d. Interior of a dorsal valve from Locality 16h, Middle Cambrian shale at Borregaard, Bornholm, Denmark, 
U.S. Nat. Mus. Cat. No. 51490a. 
Mrcromirra sp. undt. (Walcott) (p. 343). 
FreureE 7. Dorsal valve from Locality 302b, Middle Cambrian limestones near Crowfoot Ridge, Yellowstone National 
Park, Wyoming. U.S. Nat. Mus. Cat. No. 51509a. Specimen figured by Walcott [1899, Pl. LX, 
fig. 6] as ‘‘Iphidea, sp. undet.” 
Micromirra (PATERINA) PHILLIPSI (Holl) (p. 351). 
Figure 8. Top view of dorsal valve and side outline of valves from Locality 304g, Upper Cambrian Hollybush sand- 
stones, Malvern Hills, England. Copied from Davidson [1866, Pl. IV, figs. 17a and 17c]; Davidson’s 
figures were drawn from the type specimen illustrated by Holl [1865, p. 102, figs. 10b and 10c]. 
Mrcromirra (IpHIDELLA) NyssA Walcott (p. 360). 
Fiaure 9. Top view of type specimen, a ventral valve. Copied from Walcott [1908d, Pl. VII, fig. 5]. 
9a. Top view of dorsal valve. 
The specimens represented are both from Locality 4q, Middle Cambrian shale, near Gordon Mountain, Ovando 
quadrangle, Montana. U.S. Nat. Mus. Cat. Nos. 51441a and 51441b, respectively. 
Micromirra (PATERINA) ETHERIDGE! (Tate) (p. 346). 
Figure 10. Top view of type specimen, a ventral valve from Locality 315, Middle Cambrian at Curramulka, South 
Australia. Original in the collection of the University of Adelaide, South Australia; cast in the United 
States National Museum (Cat. No. 58301). Specimen figured by Tate [1892, Pl. II, figs. 7a-c] as 
Platyceras etheridget. 
10a and 10b. Side and back views of ventral valve represented in figure 10. Original in the collection of 
the University of Adelaide; cast in the United States National Museum (Cat. No. 58301). 
10c. Back view of another ventral valve from the same locality as the valve represented by figure 10. Original 
in the collection of the University of Adelaide; cast in the United States National Museum (Cat. No. 
58302). 5 
