462 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
Measurements in mm.— 
Brachial Hinge 
Length length Width width Thickness 
HMalaty pe 2. SOOO 11.0 10.6 13.5 9.6 6.6 
Paratype (110603b).......... 11.8 11.4 13.8 7.0 7.8 
os (106029) on Bon: os 10.9 10.3 13.6 10.0 6.3 
wh ( TIOGGOR NK ....:,.:sitiaskad 12.0 Oe 14.5 II.0 7.0 
"¢ (Tieoaeny 6... 5... 12.0 11.4 14.1 152 7.0 
Types.—Holotype: 110603a; figured paratypes: 110600a, 110602b, 110603b, 
110613, 117033c,d,g,h; unfigured paratypes: 110600b, 110602a, 117033a,b,e,f. 
Horizon and locality—Bromide formation (Pooleville member-O-xoplecia 
gouldi zone) in Oklahoma: In the quarry on the east side of Oklahoma High- 
way 18, center NW} sec. 11, T. 1 S., R. 3 E., 1.8 miles south of Sulphur, Murray 
County ; Rock Crossing of Hickory Creek, about center sec. 35, T.5 S., R. 1 E., 
Carter County; along U. S. Highway 77, SEJNE3 sec. 25, T. 2 S.,, R. 1 E,, 
Carter County; Mountain Lake, E} sec. 22, T. 2 S., R. 1 W., Carter County. 
Discussion.—This species resembles D. compressus from the Mountain Lake 
member of the Bromide formation of Oklahoma but differs in its more elliptical 
outlines, more convex valves, and different ornamentation. 
This species, like D. compressus, had a somewhat rounded outline and is a 
fairly small species. It is characterized by a rectimarginate commissure, a 
tendency toward production of a sulcus in both valves, thus producing an anterior 
emargination at the front. The species is most like D. compressus but differs in 
its more robust form and deeper valves. It differs from D. pervetus in not pos- 
sessing a strong pedicle sulcus and in having different ornamentation. 
DOLEROIDES OTTAWANUS Wilson 
Doleroides pervetus ottawanus Witson, Canadian Field-Nat., vol. 46, No. 6, p. 136, pl. 1, 
figs. 3-5; pl. 2, figs. 14, 15, 1932; Geol. Surv. Canada Bull. 8, p. 49, pl. 3, figs. 28, 20, 1946. 
D. pervetus Coorer, Journ. Paleont., vol. 4, No. 4, pl. 35, fig. 8, pl. 37, figs. 1, 3, 1930. 
This species is described as intermediate in character between D. gibbosus and 
D. pervetus. It can be recognized by its wider form and less strongly folded 
commissure than in D. gibbosus and its larger size than that of D. pervetus. 
Horizon and locality—Black River (Leray=Chaumont), at many localities 
in the Ottawa and St. Lawrence Valleys. 
Platteville formation in Wisconsin: At Highland, Iowa County. 
DOLEROIDES PERVETUS (Conrad) 
Orthis perveta Conran, Proc. Acad. Nat. Sci. Philadelphia, vol. 1, p. 333, 1843; Pal. New 
York, vol. 1, p. 120, pl. 32, fig. 5, 1847. 
Orthis (Dalmanella) subaequata var. perveta Conrad, WINCHELL and ScHUCHERT, Geol. 
Minnesota, vol. 3, pl. 33, fig. 42 (only), 1893. 
Doleroides pervetus (Conrad) Cooper, Journ. Paleont., vol. 4, No. 4, p. 381, pl. 36, figs. 4, 7, 
1930. 
Doleroides pervetus (Conrad) suggests a small edition of D. gibbosus which 
it precedes stratigraphically. The shell is small for the genus and suggests 
