886 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
Genus RAFINESQUINA Hall and Clarke, 1892 
Rafinesquina Hatt and CrarkeE, Pal. New York, vol. 8, pt. 1, p. 281, 1892——SatLmon, Journ. 
Paleont., vol. 16, No. 5, p. 570, 1942. 
RAFINESQUINA LENNOXENSIS Salmon 
Rafinesquina lennoxensis SaAtMon, Journ. Paleont., vol. 16, No. 5, p. 576, pl. 85, figs. 18-20, 
1942.—Witson, Geol. Surv. Canada, Bull. 8, p. 70, text fig. 1, No. 4; pl. 5, fig. 5, 1946. 
Types.—Holotype: Columbia Univ. 25884; paratype: Columbia Univ. 25885. 
Horizon and locality—Rockland formation (Napanee member) in Ontario, 
Canada: On Selby Creek, near Napanee, Lennox and Addington County. 
Same formation and member in New York: On the Sugar River south of 
Port Leyden, Port Leyden (15’) Quadrangle. 
RAFINESQUINA OLLIFORMIS Salmon 
Rafinesquina olliformis Satmon, Journ. Paleont., vol. 16, No. 5, p. 577, pl. 85, figs. 21, 22, 
1942. 
Type.—Holotype: Columbia Univ. 25886. 
Horizon and locality—Rockland formation (Napanee member) in Ontario, 
Canada: On the Selby Road 1 mile from Napanee, Lennox and Addington 
County. 
RAFINESQUINA PLANULATA Cooper, new species 
Plate 266, A, figures 1-4 
Of about medium size for the genus, wider than long ; hinge equal to or slightly 
greater than the midwidth; sides nearly straight or slightly oblique; anterior 
margin broadly rounded; cardinal extremities nearly a right angle or slightly 
acute. Pedicle valve marked by a median costella stronger than the others; 
median region from beak to margin marked by several costellae almost as strong 
as the median one; lateral areas marked by costellae of varying sizes, 1 to 4 of 
the finer ones alternating with the stronger costellae. 
Pedicle valve almost flat in lateral and anterior profile; beak prominent and 
umbo slightly and narrowly swollen. Interior with moderately long, slender 
dental ridges diverging at an angle of about 90° ; muscle area small, heart shaped. 
Brachial valve very gently concave in lateral profile and with the maximum 
concavity located near or posterior to the middle ; anterior third deflected slightly 
toward the brachial valve but nearly flat; cardinalia delicate; median ridge and 
notothyrial platform slightly thickened; cardinal process small and delicate. 
Measurements in mm.— 
Brachial Hinge 
Length length Midwidth width Thickness 
Holotype (pedicle valve) ......... 11.8 ? 16.7 18.8 
Paratype ( “ “  123281g).. 16.5 ? 21.4 24.0 ? 
s (brachial valve 123281k). ? £23 17.0 ? ? 
«“ ( « “ pegeerel) cal, - 12.6 16.9 19.9 ? 
