Figure 
FIGURE 
PLATE XIX. 
h. Central muscle scar. v. Visceral cavity. 
j. Anterior lateral muscle scar. vs. Main vascular sinus. 
s- Median septum. 
LINGULELLA BELLULA (Walcott) (p. 482). 
1. Cast of a ventral valve from Locality 114, Upper Cambrian upper sandstone beds of Little Belle Island, 
Conception Bay, Newfoundland. U.S. Nat. Mus. Cat. No. 27309a. 
la. Cast of the interior of a small ventral valve, the type specimen, from Locality 114a, Upper Cambrian 
arenaceous shales about 50 feet below the sandstone of Locality 114, Little Belle Island, Conception 
Bay, Newfoundland. U.S. Nat. Mus. Cat. No. 57082a. 
1b. Cast of the interior of a ventral valve associated with the specimen represented by figure la. U.S. Nat. 
Mus. Cat. No. 57082b. 
le. Cast of the interior of a dorsal valve, showing the arching of the parietal band outward to the main vascular 
sinus, associated in the shale with specimen represented by figure la. U.S. Nat. Mus. Cat. No. 57082c. 
id. Cast of the interior of a dorsal valve, showing the median septum and what may be the central muscle 
scars, associated in the shale with specimen represented by figure la. U.S. Nat. Mus. Cat. No. 57082d. 
le. Interior of a dorsal valve associated with the specimen represented by figure la. U.S. Nat. Mus. Cat. 
No. 57082e. 
LINGULELLA BELLA: (Walcott) (p. 481). 
[Pl. XXXVI, fig. 4.] 
2. Cast of the interior of a ventral valve from Locality 114a, Upper Cambrian arenaceous shale beneath the 
upper sandy beds on Little Belle Island, Conception Bay, Newfoundland. U.S. Nat. Mus. Cat. No. 
27307a. 
2a. Cast of the interior of a ventral valve, associated with specimen represented by figure 2, but which is 
more strongly marked by concentric and radiating strie. U.S. Nat. Mus. Cat. No. 27307b. 
2b. Cast of the interior of a dorsal valve, the area of which, owing to fracture, slightly resembles the area of a 
ventral valve. From the same bed and locality as specimen represented by figure 2. U.S. Nat. 
Mus. Cat. No. 27307c. 
2c. A somewhat broader dorsal valve than that represented by figure 2b, but associated in the same bed with 
it. U.S. Nat. Mus. Cat. No. 27307d. 
2d. Cast of the interior of a ventral valve from Locality 114b, Lower Ordovician sandstone 1 mile north of 
Lance Cove, Great Belle Island, Conception Bay, Newfoundland. U.S. Nat. Mus. Cat. No. 27308a. 
2e. Finely preserved dorsal valve, associated in the same bed with specimen represented by figure 2d. U.S. 
Nat. Mus. Cat. No. 27308b. 
2f. Cast of the interior of a convex ventral valve from Locality 114, Upper Cambrian upper sandstone beds 
of Little Belle Island, Conception Bay, Newfoundland. U.S. Nat. Mus. Cat. No. 57081a. 
2¢. Enlargement of a cast of the area of a dorsal valve, associated in the bed with specimens represented by 
figures 2d and 2e. U.S. Nat. Mus. Cat. No. 27308c. 
2h. Finely preserved ventral and dorsal valves from which the thin outer surface has been exfoliated, the 
type specimen, associated in the same bed with specimen represented by figure 2d. U.S. Nat. Mus. 
Cat. No. 27308d. 
2i. Dorsal valve from Locality 114b, see figure 2d. U.S. Nat. Mus. Cat. No. 27308e. 
2j. Cast of the interior of a ventral valve, natural size, from Locality 114b, see figure 2d. U.S. Nat. Mus. 
Cat. No. 27308f. : 
2k and 21. Exterior of ventral valves from Locality 114b, see figure 2d. U.S. Nat. Mus. Cat. Nos. 27308g 
and 27308h, respectively. 
2m. Dorsal valve. U.S. Nat. Mus. Cat. No. 273081. 
2n. Dorsal valve. U.S. Nat. Mus. Cat. No. 27308). 
20. Dorsal valve. U.S. Nat. Mus. Cat. No. 27308k. 
2p. Dorsal valve. U.S. Nat. Mus. Cat. No. 27308 1. 
2q. Dorsal valve. U.S. Nat. Mus. Cat. No. 27308m. 
DNRM 
Figures 2i, 2m-q illustrate variations in the size and outline of dorsal valves from Locality 114b, Lower Ordovician 
sandstone, 1 mile north of Lance Cove, Great Belle Island, Conception Bay, Newfoundland. 
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