PLATE XIII. 
Oxsoius (BROGGERIA) SALTERI (Holl) (p. 424). 
[Pl. XV, figs. 4, 4a-d.] 
Figure 1. Exterior of ventral valve from Locality 309i, Upper Cambrian near Sandby, Province of Malméhus, Sweden. 
U.S. Nat. Mus. Cat. No. 51673a. 
la. Ventral valve associated with the specimen represented by figure 1, showing a cast of part of the interior 
of the shell. U.S. Nat. Mus. Cat. No. 51673b. 
1b. Cast of the interior of a dorsal valve associated with the specimen represented by figure 1. U.S. Nat. 
Mus. Cat. No. 51673c. 
le. Cast of the interior of a ventral valve from Locality 3091, Upper Cambrian, Sweden (exact locality 
unknown), showing the area, more or less of the main vascular sinuses, and the visceral cavity. U.S. 
Nat. Mus. Cat. No. 51398a. 
1d. Cast of the interior of a ventral valve from Locality 101, Upper Cambrian shales, east bank of Barachois 
River, 6 miles from Little Bras d’Or Lake, Cape Breton, Nova Scotia. U.S. Nat. Mus. Cat. No. 
51671a. ; 
le. Cast of the interior of a ventral valve from Locality 3q, Upper Cambrian shales, Barachois Glen, 4 miles 
south of Little Bras d’Or Lake, Cape Breton, Nova Scotia. U.S. Nat. Mus. Cat. No. 52441a. 
1f, Cast of the interior ofa dorsal valve from Locality 3091, Upper Cambrian, Sweden (exact locality unknown). 
U.S. Nat. Mus. Cat. No. 51398b. 
lg. Cast of exterior of a ventral valve from Locality 10i, Upper Cambrian shales, Barachois River, north of 
Boisdale road, Cape Breton, Nova Scotia, with a portion of the shell covering the area broken away. 
U.S. Nat. Mus. Cat. No. 52442a. 
Th, li, and 1j. Casts of dorsal valves from Locality 101, Upper Cambrian shales, east bank of Barachois River, 
6 miles from Little Bras d’Or Lake, Cape Breton, Nova Scotia, varying in outline, owing to compres- 
sion in the shale. U.S. Nat. Mus. Cat. Nos. 51671b, 51671c, and 51671d, respectively. 
1k. Cast of dorsal valve from Locality 3q, Upper Cambrian shales, Barachois Glen, 4 miles south of Little 
Bras d’Or Lake, Cape Breton, Nova Scotia. U.S. Nat. Mus. Cat. No. 52441b. 
11. Cast of dorsal valve from Locality 10i; Upper Cambrian shales, Barachois River, north of Boisdale road, 
Cape Breton, Nova Scotia. U.S. Nat. Mus. Cat. No. 52442b. 
Im. Cast of the interior of a dorsal valve from Locality 3238f, Ceratopyge limestone at Vestfossen, 10 miles 
west-southwest of Christiania, Norway, reproduced from a photograph. The markings of the vas- 
cular system are beautifully preserved in the cast. Univ. Min. Inst. Christiania, Norway. Specimen 
iliustrated by Brégger [1882, Pl. X, fig. 10] as Obolus saltert. 
In. Interior of a ventral valve from Locality 323w, Upper Cambrian at Christiania, Norway, flattened in shale. 
it is one of the largest shells of this species known to the author. Univ. Min. Inst. Christiania, Norway. 
Oxsotus (Acritis?) RuGATUS Walcott (p. 441). 
Fieure 2. Exterior view of the type specimen from Locality 58, Middle Cambrian Secret Canyon shale, New York 
and Secret canyons, Eureka district, Nevada. U.S. Nat. Mus. Cat. No. 35229a. 
Oxpo.us (AcriTIs) ANTIQUISSIMUS (Hichwald) (p. 437). 
[P]. XV, figs. 2, 2a-d.] 
Figure 3. Surface of shell enlarged four and one-half times. Locality 396d, passage beds between the Upper Cambrian 
and the Ordovician, ‘‘glauconite limestone,’ at Domglint, in Reval, Esthonia, Russia. U.S. Nat. 
Mus. Cat. No. 51534a. 
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