PLATE III. 
Micromirra (PATERINA) STISSINGENSIS (Dwight) (p. 353). 
Figure 1. Apical view of the type specimen, a ventral valve. U.S. Nat. Mus. Cat. No. 51484a. Specimen figured 
by Dwight [1889, Pl. VI, fig. 6] as Kutorgina stissingensis. 
ja. Dorsal valve, flattened in the shale. U.S. Nat. Mus. Cat. No. 51484b. The rear view of this specimen 
was given by Dwight [1889, Pl. VI, fig. 8]. 
1b. Apical view of a cast in limestone of a ventral valve. U.S. Nat. Mus. Cat. No, 51484c. 
1c. Interior of a typical specimen of a compressed dorsal valve. U.S. Nat. Mus. Cat No. 51484d. Specimen 
figured by Dwight [1889, Pl. VI, fig. 5] as Kutorgina stissingensis. 
1d. Posterior view of a compressed ventral valve that shows the area of a narrow pseudodeltidium. 
The specimens represented by figures 1, la-d are from Locality 367d, Middle Cambrian, vicinity of Stissing, 
Dutchess County, New York. 
Fiaure le. Specimen doubtfully referred to this species from Locality 14s, Middle Cambrian, Ogygopsis zone, Mount 
Stephen, British Columbia. U.S. Nat. Mus. Cat. No. 51483a. z 
Micromirra PUSILLA (Linnarsson) (p. 339). 
Ficures 2 and 2a. Apical and posterior views of a ventral valve. U.S. Nat. Mus. Cat. No. 51478a. 
2b and 2b’. Top and side views of a ventral valve. U.S. Nat. Mus. Cat. No. 51478b. 
2c. Exterior of a dorsal valve. U.S. Nat. Mus. Cat. No. 51478c. 
The specimens represented are all from Locality 8w, Middle Cambrian limestones near Andrarum, Sweden. 
Micromirra PEALEI (Walcott) (p. 339). 
FraurEs 3, 3a, and 3b. Apical, side, and posterior views of the type specimen, from Locality 155a, Middle Cambrian 
limestone near Hillsdale, Montana. U.S. Nat. Mus. Cat. No. 26430a. Specimen figured by Walcott 
[1897b, Pl. LIX, figs. 3, 3a-b] as Iphidea pealet. 
3c. Dorsal valve from the same bed of limestone as the ventral valve represented by figure 3. U.S. Nat. 
Mus. Cat. No. 26430b. Specimen figured by Walcott [1897b, Pl. LIX, fig. 3c] as Iphidea pealet. 
3d. Ventral valve with strong radiating ridges, from Locality 159, Middle Cambrian limestone, north of West 
Gallatin (Gallatin) River, Montana. U.S. Nat. Mus. Cat. No. 51471a. 
3e and 3e’. Top and back views of a transverse dorsal valve with strong radiating ridges, from Locality 5f, 
Middle Cambrian limestone, 12 miles south of Neihart, Montana. U.S. Nat. Mus. Cat. No. 51470a. 
Micromitra (PATERINA) CRENISTRIA (Walcott) (p. 345). 
Figures 4, 4a, and 4b. Apical, side, and posterior views of the type specimen, from Locality 74, Middle Cambrian 
limestone, Tonto group, near the head of Nunkoweap Valley, Grand Canyon of the Colorado, Arizona. 
U.S. Nat. Mus. Cat. No. 2643la. . Specimen figured by Walcott [1897b, Pl. LIX, figs. 4, 4a-b] as 
Iphidea crenistria. 
Mricromirra scuupTitis (Meek) (p. 341). 
Fieures 5, 5’, and 5’. Apical, side, and posterior views of the type specimen, from Locality 302, Middle Cambrian 
limestone east of West Gallatin (Gallatin) River, Montana. U.S. Nat. Mus. Cat. No. 7864a. Speci- 
men figured by Walcott [1884b, Pl. I, figs. 7, 7a] as Kutorgina sculptilis. " 
5a, 5a’, and 5a’’. Top, side, and back views of a ventral valve from Locality 302b, Middle Cambrian lime- 
stones near Crowfoot Ridge, Yellowstone National Park, Wyoming. U.S. Nat. Mus. Cat. No. 35212a. 
Specimen figured by Walcott [1899, Pl. LX, figs. 5, 5a-c]. A portion of its surface is enlarged in 
figure 5e. 
5b. Dorsal valve from Locality 58, Middle Cambrian Secret Canyon shale, Eureka district, Nevada. U.S. 
Nat. Mus. Cat. No. 2455la. Specimen figured by Hall and Whitfield [1877, Pl. I, fig. 11] as Kutorgina 
minutissima; and by Walcott [1884b, Pl. I, fig. 7b] as Kutorgina sculptilis. 
5e. Dorsal valve associated with the shell represented by fig. 5b. U.S. Nat. Mus. Cat. No. 24551b. Specimen 
figured by Hall and Whitfield [1877, Pl. I, fig. 12] as Kutorgina minutissima; and by Walcott [1884b, 
Pl. IX, fig. 7] as Kutorgina sculptilis. 
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