PLATE LXXXVII. 
WIMANELLA? ANOMALA (Walcott) (p. 745). 
p 
; ; 52233 
Fiaure 1. Exterior of a compressed ventral valve, the type specimen. U.S. Nat. Mus. Cat. No. aa 
la. Impression in shale of imperfect, compressed ventral valve. U.S. Nat. Mus. Cat. No. 55223b.52233b 
lb. Area and posterior portion of imperfect, compressed ventral valve. U.S. Nat. Mus. Cat. No. 552238e.§2233¢ 
le. Interior of distorted dorsal valve. U.S. Nat. Mus. Cat. No. 55223d. 52233a 
1d. Impression in shale of distorted dorsal valve. -U. S. Nat. Mus. Cat. No. 55223e.52233e 
le. Exterior of dorsal valve doubtfully referred to this species. U.S. Nat. Mus. Cat. No. 55223. 522334 
The specimens represented are all from Locality 90, Middle Cambrian Conasauga shale on Edwards farm, near 
Craigs Mountain, about 10 miles (16 km.) southeast of Center, Cherokee County, Alabama. 
BILLINGSELLA? APPALACHIA Walcott (p. 750). 
Fiaure 2. Compressed and distorted ventral valve. U.S. Nat. Mus. Cat. No. 57073a. 
2a. Compressed ventral valve, the type specimen, preserving surface coste. U.S. Nat. Mus. Cat. No. 57073b. 
2b. Impression in shale of compressed dorsal valve. U.S. Nat. Mus. Cat. No. 57073c. 
The specimens represented are all from Locality 121, Middle Cambrian Rogersville shale, road just east of Harlan 
Knob, 4 miles (6.4 km.) northeast of Rogersville, Hawkins County, Tennessee. 
BILLINGSELLA SALEMENSIS (Walcott) (p. 763). 
Figure 3. Exterior view of the type specimen, a ventral valve, with side outline. The slope of the cardinal area is 
drawn in from the position of the beak and the cardinal angle. U.S. Nat. Mus. Cat. No. 17448a. 
3a. Exterior of an imperfect dorsal valve. U.S. Nat. Mus. Cat. No. 17443b. 
The specimens represented by figures 3 and 3a are from Locality 86, Lower Cambrian limestone, 1 mile (1.6 km.) 
south of Shushan and 3.5 miles (5.6 km.) north-northeast of Cambridge, Washington County, New York. The figures 
(3 and 3a) are redrawn from the specimens illustrated by Walcott [1887, Pl. I, figs. 17 and 17a, respectively]. 
BILLINGSELLA HIGHLANDENSIS (Walcott) (p. 756). 
Ficure 4. Exterior of imperfect ventral valve. U.S. Nat. Mus. Cat. No. 15355a. Specimen figured by Walcott 
[1886b,. Pl. VIII, fig. 3b]. 
4a. Interior cast of ventral valve, the outline of which has been restored from another specimen (Cat. No. 
15355e). U.S. Nat. Mus. Cat. No. 15355b. 
4h. Interior cast of a ventral valve with deep furrows that represent the ridges of the main vascular trunks 
and the median ridge at the bottom of the delthyrium. The cast of the dental plates is also clearly 
shown. U.S.Nat.Mus. Cat. No. 15355c. Type specimen figured by Walcott [1886b, Pl. VII, fig. 3a]. 
4c. Imperfect cast of the interior of a dorsal valve. U.S. Nat. Mus. Cat. No. 15355d. Specimen figured by 
Walcott [1886b, Pl. VIII, fig. 3]. ; 
The specimens represented are all from Locality 31a, Lower Cambrian limestone in Pioche formation near Pioche, 
Lincoln County, Nevada. 
WIMANELLA HARLANENSIS (Walcott) (p. 746). 
Ficure 5. Exterior of imperfect ventral valve. U. 8. Nat. Mus. Cat. No. 52252a. Another specimen (Cat. No. 
52252b) was used in drawing certain portions of this figure. ‘ 
5a. Exterior of dorsal valve. U.S. Nat. Mus. Cat. No. 52252c. 
5b. Cast of interior of ventral valve, the type specimen, associated on same hand specimen with figure 5a. 
U.S. Nat. Mus. Cat. No. 52252d. 
5c. Partial cast of interior of ventral valve. U.S. Nat. Mus. Cat. No. 52252e. 
5d. Cast of interior of a beautifully preserved portion of an abnormal dorsal valve. U.S. Nat. Mus. Cat. 
No. 52252f. Another specimen (Cat. No. 52252¢) was used in drawing certain portions of this figure. 
The specimens represented are all from Locality 121, Middle Cambrian Rogersville shale, road just east of Harlan 
Knob, 4 miles (6.4 km.) northeast of Rogersville, Hawkins County, Tennessee. 
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