392 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
ANOMALORTHIS LONENSIS (Walcott) 
Orthis lonensis Watcort, U. S. Geol. Surv. Mon. 8, p. 74, pl. 11, figs. 6, 6a, 1884. 
Anomalorthis lonensis (Walcott) UtricH and Cooper, Geol. Soc. Amer. Special Pap. 13, 
p. 127, pl. 21E, figs. 18, 22-25, 27, 1938. 
Types—Holotype: 17232; hypotypes: 91281a-d; figured specimen : 91280. 
Horizon and locality —Upper Pogonip group in Nevada: At Lone Mountain, 
18 miles northwest of Eureka, Roberts Mountains (1°) Quadrangle. 
Swan Peak formation in Utah: 1 mile west of Ibex, in Smooth Canyon, Con- 
fusion Range, Millard County. 
ANOMALORTHIS NEVADENSIS Ulrich and Cooper 
Plate 78, B, figures 10-12 
Anomalorthis nevadensis ULricu and Cooper, Geol. Soc. Amer. Special Pap. 13, p. 127, 
pl. 21D, figs. 13-17, 1938. 
Types.—Holotype: 92853c ; paratypes: 92853a,b. 
Horizon and locality—Upper Pogonip group in Nevada: At west base of 
Lone Mountain, 18 miles northwest of Eureka; Ikes Canyon, east side Toquima 
Range, Roberts Mountains (1°) Quadrangle. North end Ely Springs Range, 
Highland (15’) Quadrangle. Pogonip Ridge, White Pine District. 
ANOMALORTHIS OKLAHOMENSIS Ulrich and Cooper 
Plate 78, C, figures 13-20 
Anomalorthis oklahomensis Utricnw and Cooper, Journ. Paleont., vol. 10, No. 7, p. 622, 1936; 
Geol. Soc. Amer. Special Pap. 13, p. 128, pl. 22A, figs. 1-6, 1938. 
Subpyramidal in profile and with the pedicle valve having a greater depth than 
the brachial one ; hinge about as wide as the width at the middle or slightly less; 
multicostellate, costellae fine, rounded, subequal, 3 to 5 in the space of 1 mm. at 
the front margin of a valve 11 mm. long. 
Pedicle valve hemipyramidal with a strongly procline interarea often slightly 
convex outward ; umbonal region gently convex but front median part depressed 
to form a conspicuous sulcus; lateral profile nearly flat; anterior profile steeply 
rounded. Flanks bounding sulcus convex; slopes to the cardinal margin slightly 
concave. 
Brachial valve gently convex in lateral and anterior profiles ; umbo and median 
region marked by a shallow, narrow sulcus; median region swollen; slopes to 
the cardinal extremities short and moderately steep. 
Measurements in mm.— 
Brachial Hinge 
Length length Width width Thickness 
Lectotype (pedicle valve) ........ 7.9 ? 13.8 13.7 5.6 
Paratype (pedicle valve 92854e).. 12.5 ? 16.8 19.0 ? 5.7? 
+f (brachial valve 92854b). ? 10.7 13.4 11.8 ? 231? 
Hypotype( “ Sue ORR DS fae 17.6 21.0 z ? 
Types.—Lectotype: 92854a; figured paratypes: 92854b, 92855, 110182; un- 
figured paratypes : 92854c-e. 
