PLATE LXXXTIX. 299 
EoortTHis KICHOUENSIS (Walcott) (p. 782). 
Figures 5 and 5’. Exterior and side views of a ventral valve, the type specimen, from Locality €75, Middle Cambrian 
limestone, Kichou formation, 4.5 miles (7.2 km.) south of Wutaihien, Shansi, China. U.S. Nat. Mus. 
Cat. No. 52550a. 
EoorTHIs AGRESTE (Walcott) (p. 773). 
Ficure 6. Exterior and side views of a ventral valve, the type specimen, from Locality €28, Middle Cambrian 
Changhia limestone 1 mile (1.6 km.) east-southeast of Changhia, Shantung, China. U.S. Nat. Mus. 
Cat. No. 52545a. 
6a. Enlargement of the radiating ribs on another specimen. U.S. Nat. Mus. Cat. No. 52545b. 
Eoorruis sp. undt. ¢ (Walcott) (p. 793). 
Figure 7. Exterior and side views of a small ventral valve from Locality €26, Middle Cambrian Changhia limestone 
2 miles (3.2 km.) north-northeast of Changhia, Shantung, China. U.S. Nat. Mus. Cat. No. 52554a. 
EKoorruis sp. undt. d (Walcott) (p. 793). 
Ficure 8. Exterior of a ventral valve from Locality C71, Middle Cambrian limestone, Kichou formation, 4 miles 
(6.4 km.) southwest of Tungyu, Shansi, China. U.S. Nat. Mus. Cat. No. 52555a 
HUENELLA ETHERIDGEL Walcott (p. 807). 
Figures 9 and 9’. Top and side views of a dorsal valve from Locality 315c, Middle ? Cambrian, Archzeocyathinz white 
limestone at Wirrialpa, Flinders Range, South Australia. Type specimen in the collection of the 
University of Adelaide, South Australia; cast in the United States National Museum, Cat. No. 53678b. 
9a and 9a’. Top and side views of a ventral valve associated with the specimen represented by figure 9. 
Original in the collection of the University of Adelaide, South Australia; cast in the United States 
National Museum, Cat. No. 53678a. 
The figures are both copied from Walcott [1908d, Pl. X, figs. 13a and 13, respectively]. They represent the 
specimens illustrated by Etheridge [1905, Pl. X XV, figs. 10 and 9, respectively] as Orthis (or Orthisina) sp. 
DicELLomus PRoLIFIcUS Walcott (p. 578). 
Frevures 10 and 10’. Top view and side outline of a broad form of the ventral valve, the type specimen. U.S. Nat. 
Mus. Cat. No. 51925a. Copied from Walcott [1908d, Pl. VIII, fig. 3]. 
10a and 10a’. Top view and side outline of a narrow ventral valve. U.S. Nat. Mus. Cat. No. 51925c. 
10b and 10b’. Top view and side outline of dorsal valve. U.S. Nat. Mus. Cat. No. 51925b. Copied from 
Walcott [1908d, Pl. VIII, fig. 3a]. 
The specimens represented are all from Locality 10z, Middle Cambrian Marjum limestone in the long cliff about 
2 miles (3.2 km.) southeast of Marjum Pass [Walcott, 1908f, p. 179 and Pls. XIII and XV], House Range, Utah. 
Dicettomus pArvus Walcott (p. 574). 
Figure 11. Top view of partly exfoliated ventral valve. U.S. Nat. Mus. Cat. No. 52523c. 
11a and 11b. Interiors of dorsal valves. U.S. Nat. Mus. Cat. Nos. 52523a and 52523b, respectively. Copied 
from Walcott [1908d, Pl. VIII, figs. 2 and 2a, respectively]. Figure 11b represents the type specimen. 
lle. Exterior of a dorsal valve. U.S. Nat. Mus. Cat. No. 52523d. 
11d. Exterior of a young shell. U.S. Nat. Mus. Cat. No. 52523e. 
The figures represented are all from Locality €6, Middle Cambrian shales, Kiulung group, 2.5 miles (4 km.) south- 
west of Yenchuang, Sintai district, Shantung, China. 
