PLATE XL. 
v. Visceral cavity. 
LINGULELLA (LINGULEPIS) ACUMINATA (Conrad) (p. 545). 
[Pl]. XXXIV, figs. 3, 3a-e; Pl. XLI, figs. 1, la-n; and Pl]. XLII, figs. 1, 1a-o.] 
Figure 1. Ventral valves, the type specimens, from Locality 338s, Upper Cambrian sandstone at High Bridge on 
Ausable River, Essex County, New York. Copied from Hall [1847, text fig., p. 9], who states that the 
figure is copied from a drawing made by Conrad. 
Ja. Ventral valves from Locality 338s, Upper Cambrian sandstone at High Bridge on Ausable River, Essex 
County, New York. Copied from Emmons’s figure [1842, text fig. 68, p. 268] of Lingula antiqua. 
1b. Partly exfoliated ventral valve, showing the visceral cavity, from Locality 110, Upper Cambrian sand- 
stone, east side of the town of Whitehall, New York. U.S. Nat. Mus. Cat. No. 51877a. 
Je. Narrow ventral valve associated on the same slab of rock with figure 1b. U.S. Nat. Mus. Cat. No. 51877b. 
1d and Je. Dorsal valves associated with the ventral valves represented. by figures 1b and Ic. U.S. Nat. 
Mus. Cat. Nos. 51877c and 51877d, respectively. 
if and 1g. Small ventral and dorsal valves, from Locality 109, Upper Cambrian sandstone 1.5 miles south of 
Deweys Bridge on the Champlain Canal, Washington County, New York. U.S. Nat. Mus. Cat. 
Nos. 51879a and 51879b, respectively. 
th. Ventral valve from Locality 76a, Upper Cambrian arenaceous limestone 1 mile north of Saratoga Springs, 
New York. U.S. Nat. Mus. Cat. No. 52469a. 
i, 1j, and 1k. Ventral valves, from Locality 76, Upper Cambrian impure limestones 4 miles west of Saratoga 
Springs, New York. U.S. Nat. Mus.:Cat. Nos. 51878a, 51878b, and 51878c, respectively. 
11, 1m, and In. Dorsal valves associated with the specimens represented by figures li, 1j, and iis, Wis Se 
Nat. Mus. Cat. Nos. 51878d, 51878e, and 51878f, respectively. 
lo. A broad ventral valve, from Moca 392, Upper Cambrian Potsdam sandstone, Burgess, Canada. WS 
Nat. Mus. Cat. No. 17999a. 
lp and 1q. Narrow and broad form of the ventral valve, from Locality 105, Upper Cambrian limestone at 
Bishops Mill, Hancock County, Tennessee. U. S. Nat. Mus. Cat. Nos. 5188la and 51881b, 
respectively. 
lr and 1s. Dorsal valves associated with the ventral valves repreented by figures lp and lq. U.S. Nat. 
Mus. Cat. Nos. 51881c and 51881d, respectively. 
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