PLATE XXXVII. 
ce. Trapezoidal area, including central, p. Pedicle groove. 
middle lateral, and outside lateral * ps. Parietal band. 
muscle scars. s. Median septum. 
g. Umbonal muscle sear. v. Visceral cavity. 
h. Central muscle scar. vs. Main vascular sinus. 
i. Transmedian muscle scar. ivs. Lateral branches of the vascular system. 
j. Anterior lateral muscle scar. x. Heart-shaped cavity. 
1. Outside lateral muscle scar. 
OBOLUS SELWYNI (Matthew) (p. 413). 
[PI]. XXXVI, figs. 1, la-h, 2, 2a-b.] 
Ficure 1. Exterior of a distorted ventral valve. University of Toronto, Canada. Possibly one of the specimens used 
by Matthew in preparing the diagrammatic figures mentioned under figure 1c. 
la. Cast of an interior ofa ventral valve. University of Toronto, Canada. 
1b. Cast of an interior of a ventral valve that has been compressed laterally. University of Toronto, Canada. 
Possibly one of the specimens used by Matthew in preparing the diagrammatic figures mentioned 
under figure 1c. 
le. Cast of an interior of a dorsal valve. University of Toronto, Canada. Redrawn from the specimen upon 
which Matthew [1903] based the diagrammatic figures in the right-hand figure on page 117 and in 
figure 1b of Plate VII of his paper. It may be taken as the type. 
ld. Finely preserved interior of a ventral valve. University of Toronto, Canada. Possibly one of the speci- 
mens used by Matthew in preparing th e diagrammatic figures mentioned under figure Ic. 
le. Interior of the posterior portion of a dorsal valve. University of Toronto, Canada. 
1f. Cast of an interior of a dorsal valve. University of Toronto, Canada. Possibly one of the specimens used 
by Matthew in preparing the diagrammatic figures mentioned under figure lc. 
The specimens represented are all from Locality 307d, Middle Cambrian sandy limestone of Division E2a? on 
Youngs Point, near George River Station, Cape Breton, Nova Scotia. 
LINGULELLA (LINGULEPIS) sTaRRI (Matthew) (p. 559). 
Ficure 2. Poorly preserved ventral valve. University of Toronto, Canada. 
2a. Dorsal valve preserving a portion of the shell. University of Toronto, Canada. 
2b. Cast of a portion of the interior of a ventral valve. University of Toronto, Canada. 
The specimens represented are all from Locality 308ce, Upper Cambrian shales of Matthew’s Johannian at St. John, 
New Brunswick. According to Matthew the type specimens have been either mislaid or lost. All the figures are 
drawn from new material collected by him at the type locality. 
LINGULELLA MINOR (Matthew) (p. 519). 
Ficure 3. Cast of the exterior of a ventral valve slightly compressed and distorted in the shale. University of Toronto, 
Canada. Type specimen, figured by Matthew [1892, Pl. XII, fig. 5a] as Lingulella starri minor. 
3a. Dorsal valve from which nearly all of the shell is exfoliated. University of Toronto, Canada. Specimen 
figured by Matthew [1892, Pl. XII, fig. 5b] as Lingulella starri minor. 
8b. Enlargement of the outer surface of the shell. University of Toronto, Canada. 
3c. Ventral valve from siliceous shale. U.S. Nat. Mus. Cat. No. 51765a. 
3d and 3e. Small ventral and dorsal valves from a fine arenaceous shale. U.S. Nat. Mus. Cat. Nos. 51765b 
and 51765c, respectively. 
3f and 3g. Small broad form of ventral and dorsal valves associated with narrower forms represented by figures 
3d and 3e. U.S. Nat. Mus. Cat. Nos. 51765d and 51765e, respectively. 
The specimens are all from Locality 2x, Upper Cambrian sandstones on Long Island, Kennebecasis Bay, St. John 
County, New Brunswick. 
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