PGA, XOXX. 
h. Central muscle scar. s. Median septum. 
i. Transmedian muscle scar. vy. Visceral cavity. 
j. Anterior lateral muscle scar. vs. Main vascular sinus. 
LINGULELLA FERRUGINEA Salter (p. 496). 
[PI. XXX, fig. 1; Pl. XX XI, figs. 3, 3a-c; and Pl. XXXYV, figs. 4, 4a-b.] 
Figure 1, Cast of the interior of a ventral valve compressed in the shale of Division lc of Matthew [1886, p. 82], 
in New Brunswick (locality not given). University of Toronto, Canada. Specimen figured by 
Matthew [1886, Pl. V, fig. 9d] as Lingulella dawsoni. 
Ja. Ventral and dorsal valves from Locality 3011, Middle Cambrian shales of Division 1d of Matthew on 
Porters Brook, St. John County, New Brunswick. University of Toronto, Canada. Specimens 
figured by Matthew [1886, Pl. V, figs. 8, 8a—b] as Lingulella linguloides. 
1b and le. Ventral and dorsal valves shown in figure la. University of Toronto, Canada. 
1d. Ventral valve from Locality 391k, Middle Cambrian, St. John formation in St. John, New Brunswick. 
Cornell University, Ithaca, N. Y. Specimen figured by Walcott [1884a, Pl. V, fig. 8] as Lingula ? 
dawsoni. 
le. Small exfoliated ventral valve from Locality 1a, Middle Cambrian shale on Manuels Brook, Conception 
Bay, Newfoundland. U.S. Nat. Mus. Cat. No. 51757a. 
lf. Distorted ventral valve from Locality 2, Middle Cambrian shales on Manuels Brook, Conception Bay, 
Newfoundland. U.S. Nat. Mus. Cat. No. 56997a. 
lg. Cast of the exterior of a distorted ventral valve, associated with the specimen represented by figure If. 
U.S. Nat. Mus. Cat. No. 56997b. 
1h. Interior of part of a dorsal valve, associated with specimen represented by figure If. U.S. Nat. Mus. Cat. 
No. 56997c. 
li. Slightly distorted dorsal valve associated with specimen represented by figure 1f. U.S. Nat. Mus. Cat. 
No. 56997d. 
1j. Unusually convex and well-preserved ventral valve associated with specimen represented by figure 1f. 
U.S. Nat. Mus. Cat. No. 56997e. 
1k. Exfoliated, slightly distorted ventral valve, associated with specimen represented by figure lf. U.S. 
Nat. Mus. Cat. No. 56997f: Sea 
11. Partly exfoliated ventral valve from the limestones interbedded in the shales of Locality 1, Middle 
Cambrian, Manuels Brook, Conception Bay, Newfoundland. The peculiar appearance of what is 
shown of the interior of the shell is partly explained by figure lo, which is compressed in the shale. 
U.S. Nat. Mus. Cat. No. 51756c: 
Im. Ventral valve, associated with specimen represented by figure 11. A portion of the outer surface is” 
exfoliated so as to show the characteristic markings of the inner surface. U.§8. Nat. Mus. Cat. 
No. 51756d. 
In. Cast of a dorsal valve showing the cast of a median septum and area, from Locality 1a, Middle Cambrian 
sandy shale 50 feet lower in the section than specimens represented by figures 1] and lm, on Manuels 
Brook, Conception Bay, Newfoundland. U.S. Nat. Mus. Cat. No. 51757b. 
lo. Cast of the interior of a ventral valve showing the area of a portion of the visceral cavity. From Locality 
1, Middle Cambrian shale, Manuels Brook, Conception Bay, Newfoundland. U.S. Nat. Mus. Cat. 
No. 51756a. : 
1p. Very nearly perfect dorsal valve, associated with the specimen represented by figure 11. U.S. Nat. 
Mus. Cat. No. 51756e. 
lq. Cast of the interior of a dorsal valve associated with the specimen represented by figure 1]. U.S. Nat. 
Mus. Cat. No. 517568. ; 
lr. Interior of a dorsal valve, showing vascular sinus and median septum; also the ridges bounding the path of 
advance of the central scars. Associated with the specimen represented by figure 11. U.S. Nat. 
Mus. Cat. No. 51756g. 
1s. Cast of the interior of a dorsal valve from Locality 1, Middle Cambrian shale on Manuels Brook, Concep- 
tion Bay, Newfoundland. U.S. Nat. Mus. Cat. No. 51756b. 
lt. Ventral valve, laterally compressed, preserving the fine surface markings described in the text. Collected 
from Locality 6g, Middle Cambrian limestone, Chapple Arm, Trinity Bay, Newfoundland. U.S. Nat. 
Mus. Cat. No. 51759a. 
lu. Cast showing part of the interior of a ventral valve from Locality 308, Upper Cambrian shales of Division 
C3e of Matthew’s section at Navy Island, St. John Harbor, New Brunswick. University of Toronto. 
The specimen represented by figure 1u was illustrated by Matthew [1892, Pl. XII, fig. 8b] as Obolella? 
gemmula. 
102 
