PLATE XCVII. 325 
BILLINGSELLA PUMPELLYI Walcott (p. 760). 
Ficure 8. Top and side view of partly exfoliated ventral valve, the type specimen, from Locality €61, Upper Cam- 
brian limestone 3 miles (4.8 km.) southwest of Yenchuang, Sintai district, Shantung, China. U. S. 
Nat. Mus. Cat. No. 52558a. 
8a. Top and side view of cast of a ventral valve from Locality €36, Upper Cambrian Chaumitien limestone 
at Chaumitien, Changhia district, Shantung, China. U.S. Nat. Mus. Cat. No. 52557a. 
8b. Interior of dorsal valve associated with the specimen represented by figure 8a. U.S. Nat. Mus. Cat. 
No. 52557b. 
8c. Enlargement of outer surface, near front margin, of a shell associated with the specimen represented by 
figure 8. U.S. Nat. Mus. Cat. No. 52558b. 
EoorrTHis NEWTONENSIS (Weller) (p. 784). 
Fiaures 9 and 9a. Cast of interior of ventral and dorsal valves, with side outline of ventral valve (9’), from Locality 
lic, Upper Cambrian Hardyston quartzite, O’ Donnell and McManniman’s quarry, Newton, Sussex 
County, New Jersey. U.S. Nat. Mus. Cat. Nos. 52352a and 52352b, respectively. 
EoorTHIS JOHANNENSIS (Matthew) (p. 781). 
Figure 10. Top and side views of ventral valve, the type specimen. University of Toronto, Canada. 
10a. Top and side views of dorsal valve. University of Toronto, Canada. ; 
The specimens represented are both from Locality 808b, Upper Cambrian limestone in shales of Division C3a of 
Matthew, Germaine Street, St. John, St. John County, New Brunswick. The figures are redrawn from the specimens 
illustrated by Matthew [1892, Pl. XII, figs. 13a-c] as Orthisina (2?) johannensis. 
Eoorruis sALTENSIS (Kayser) (p. 788). 
Figure 11. Group of shells on fragment of rock from Locality 389, Upper Cambrian sandstone at Salta, Argentina. 
Type specimen, copied from Kayser [1876, Pl. I, fig. 16]. 
11’. Casts of two ventral valves on fragment of rock from Locality 389a, Upper Cambrian sandstone at Nevado 
de Castillo, Province of Salta, Argentina. Copied from Kayser [1876, Pl. I, fig. 15]. 
Eoorruts PAGODA (Walcott) (p. 784). 
Fieures 12 and 12a. Partly exfoliated ventral valves. U.S. Nat. Mus. Cat. Nos. 52552a and 52552b, respectively. 
Figure 12 represents the type specimen. 
12b. Partly exfoliated dorsal valve. U.S. Nat. Mus. Cat. No. 52552c. 
12c. Interior of dorsal valve. U.S. Nat. Mus. Cat. No. 52552d. 
12d. Enlargement of a portion of the outer surface of the shell. U.S. Nat.'Mus. Cat. No. 52552e. 
The specimens represented are all from Locality C56, Upper Cambrian Chaumitien limestone at Pagoda Hill, 
1 mile (1.6 km.) west of Tsinan, Shantung, China. ‘ 
Eoorruts boris (Walcott) (p. 779). 
Fieures 13 and 13a. Top and side views of two ventral valves from Locality €64, Upper Cambrian limestone 2.7 miles 
(4.4 km.) southwest of Yenchuang, Sintai district, Shantung, China. U.S. Nat. Mus. Cat. Nos. 52551a 
and 52551b, respectively. Figure 13a represents the type specimen. 
Nisusra compta (Tate) (p. 727). 
Fiaure 14. Top and side views of the type specimen of the species from Locality 315, Middle? Cambrian limestone 
at Curramulka, Yorke Peninsula, South Australia. University of Adelaide, South Australia. Speci- 
men figured by Tate [1892, Pl. II, figs. 6 and 6a] as Orthisina compta. 
Koorruis TATEL (Etheridge) (p. 789). 
Fieures 15, 15’, and 15a, 15a’. Top and side views of ventral and dorsal valves from Locality 315b, Middle? Cambrian 
limestone at Wirrialpa, Flinders Range, South Australia. University of Adelaide, South Australia. 
Figures 15 and 15a are redrawn from the specimens illustrated by Etheridge [1905, Pl. XXV, figs. 
7 and 8, respectively]. Figure 15a represents the type specimen. 
