586 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
Horizon and locality.—Cloche Island member of the Rockland formation in 
Ontario, Canada: South of Helen Lake, La Cloche Island, Manitoulin District. 
Rockland formation in Ontario, Canada: At Paquette Rapids. 
CAMERELLA sp. 1 
Plate 106, A, figures 1-5 
Shell large for the genus, wider than long, subtriangular to subpentagonal in 
outline ; variable ; paucicostate with the fold having 3 costae and the sulcus 2 or 
3; flanks with 2 to 4 costae; posterior half smooth. 
Pedicle valve with gentle convexity to the lateral profile and slight convexity 
to the anterior profile. Umbonal region flatly convex, sulcus originating at the 
middle, deep and moderately wide; flanks flattened. 
Brachial valve moderately convex in lateral profile; strongly convex in lateral 
profile; umbonal and median regions moderately swollen; fold originating at the 
middle, moderately elevated, somewhat narrow. Flanks moderately swollen and 
with steep slopes. 
Measurements in mm.— 
Brachial Hinge 
Length length Width width Thickness 
DLFUAOG Lt we OE, Aa II.5+ 10.9 12.1 3.5 8.1 
WEZLAQD 2 a Ate aOR eh 12.90+ T22 16.9 27 8.7 
Figured specimen.—117149d ; measured specimen: 117149b. 
Horizon and locality.—Low in the Benbolt formation in Tennessee: 0.1 to 0.2 
mile north of the road, 1.1 miles northeast of Lee Valley, Lee Valley (T.V.A. 
171-NW) Quadrangle. 
Discussion—This species suggests bicostate examples of C. quadricostata 
(Willard) from the Hogskin member of the Lincolnshire formation. It appears 
to be wider and to have more narrowly rounded lateral margins than the Hogskin 
species. 
CAMERELLA sp. 2 
Plate 112, F, figures 30-33 
Three poorly preserved specimens, probably immature individuals. Small, 
paucicostate and narrowly lenticular in both profiles. There are 2 costae in the 
sulcus, 3 on the fold, and 3 on the flanks. Fold and sulcus originating at the 
middle, the former narrow and short, the latter shallow. 
Measurements in mm.—117150a, length 7.8, brachial length 6.9, width 8.3, 
thickness 4.3. 
Figured specimens.—117150a,b. 
Horizon and locality—Blackford formation (basal conglomerate zone) in 
Virginia: Just north of the junction of Virginia Highways 100 and 42, Staffords- 
ville, Giles County. 
CAMERELLA sp. 3 
Plate 117, C, figures 13-18 
Small, probably immature because of the slender profile; subtriangular in out- 
line ; paucicostate, the posterior two-thirds smooth, the anterior third costate 
