PLATE XXXVIIT. 
a. Central Jateral space of area. s. Median septum. 
a’. Outer lateral space of area. v. Visceral cavity. 
f. Flexure line of area. vs. Main vascular sinus. 
h. Central muscle scar. ivs. Lateral branches of the vascular system. 
j. Transmedian muscle scar. pvs. Peripheral branches of the vascular system. 
p. Pedicle groove. x. Heart-shaped cavity. 
LINGULELLA MARTINENSIS Matthew (p. 518). 
Figure 1. Exterior of an unusually well-preserved ventral valve. University of Toronto, Canada. Drawn from 
a specimen in Matthew’s type and figured material, but closer identification is impossible. 
Ja. Cast of the interior of a ventral valve. University of Toronto, Canada. Type specimen figured by 
Matthew [1895a, Pl. II, fig. 6d]. ; 
lb. Interior of a ventral valve from which nearly all of the inner layers of the shell have been exfoliated. 
University of Toronto, Canada. Drawn from aspecimen in Matthew’s type and figured material, but 
closer identification is impossible. 
le. Interior of a dorsal valve. University of Toronto, Canada. Drawn from aspecimen in Matthew’s type and 
figured material, but closer identification is impossible. 
1d. Cast of the interior of a dorsal valve. University of Toronto, Canada. Specimen figured by Matthew 
[1895a, Pl. IT, fig. 6b]. 
le. Enlargement of the area of the specimen represented by figure id. 
The specimens represented by figures 1, la—e are from Locality 2f, Middle Cambrian sandstones of Division 1b1, 
on Hanford Brook, St. John County, New Brunswick. 
Fieures lf and lg. Ventral and dorsal valves which occur in the collection of the University of Toronto, Canada, 
labeled by Matthew as Lingulella dawsoni from Division lc of the St. John slate. They appear 
to be’ more nearly related to Lingulella martinensis. They may or may not be the specimens 
illustrated by Matthew [1886, Pl. V, figs. 9, 9a-c]. 
LINGULELLA GRANDIS (Matthew) (p. 502). 
Fieure 2. Partly exfoliated dorsal valve. University of Toronto, Canada. 
2a. Cast of the interior of the posterior portion of a ventral valve. University of Toronto, Canada. 
Figures 2 and 2a (with 2c and 2d) are drawn from specimens in Matthew’s type material of Lingulella ? cuneata, but 
it is impossible to tell which of these he figured [1894, Pl. XVI, figs. 5a—b]. 
Figure 2b. Slightly imperfect cast showing the greater part of the interior of a ventral valve. University of 
Toronto, Canada. Type specimen, figured by Matthew [1894, Pl. XVI, fig. 7a] as Leptobolus grandis. 
2c. Cast of the interior of a ventral valve. University of Toronto, Canada. 
2d. Cast of the interior of a dorsal valve. University of Toronto, Canada. 
Figures 2c and 2d (with 2 and 2a) are drawn from specimens in Matthew’s type material of Lingulella ? cuneata, but 
it is impossible to tell which of these he figured [1894, Pl. XVI, figs. 5a—b]. : 
Fieure 2e. Posterior portion of a dorsal valve, showing cast of the area. University of Toronto, Canada. Labeled 
by Matthew as Leptobolus grandis. i 
2f. Part of the interior of a dorsal valve. University of Toronto, Canada. Specimen figured by Matthew 
[1894, Pl. XVI, fig. 7b] as Leptobolus grandis. 
The specimens represented by figures 2, 2a-f are all from Locality 301s, Lower Ordovician sandstone at McAphee’s 
Corner, Hardingville, St. John County, New Brunswick. 
Oxsotts BELLI (Billings) (p. 386). 
Figures 3 and 3a. Ventral valves from Locality 319n, Ordovician, on the island of Montreal, Canada. Geol. Survey 
Canada. Redrawn from the specimens figured by Billings [1859, pp. 431-482, figs. 7 and 8], but closer 
identification is impossible. Figure 3 may be taken as the type. 
3b. Dorsal valve associated with the specimens represented by figures 3 and 3a. Geol. Survey Canada. 
LINGULELLA WELLERI (Walcott) (p. 539). 
Figure 4. Compressed and somewhat crushed ventral valve, the type specimen, showing only the general outline 
and the outer surface. U.S. Nat. Mus. Cat. No. 35292a. 
4a. Apex and posterior portion of the ventral valve, preserving the convexity. U.S. Nat. Mus. Cat. No. 
35292b. 
4b. A compressed dorsal valve. U.S. Nat. Mus. Cat. No. 35292c. 
The specimens represented are all from Locality 11e, Upper Cambrian sandstone, O’ Donnell and McManniman’s 
quarry, Newton, New Jersey. 
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