NO. 12 PERMIAN BRACHIOPODS FROM OREGON—COOPER 61 
not have the narrowed beak of the Oregon species. The same differ- 
ence separates the Oregon species from C. pectinifera (Sowerby) as 
figured by Tschernyschew (1902, pl. 43, fig. 4). The species of 
Cleiothyridina from Pakistan and Timor are all large forms. 
Netschajew (1911, pl. 13) figures a variety of small to medium- 
sized Cleiothyridina under the name of C. pectinifera (Sowerby), 
some of which are somewhat attenuated but none of which are like 
the Oregon species. 
CLEIOTHYRIDINA GERARDI (Diener) 
Plate 11E, figures 28-31 
Athyris gerardi DiENER, Palaeont. Indica, Geol. Surv. India, ser. 15, vol. 1, pt. 2, 
p. 56, pl. 6, figs. 12-14, 1899. 
Cleiothyridina gerardi (Diener) Branson, Geol. Soc. Amer. Mem. 26, p. 317, 
1948. 
Two specimens of a large and transverse Cleiothyridina have fea- 
tures of this species. The figured specimen preserves both valves 
but the beak of the pedicle valve is missing. The pedicle valve is 
gently convex in profile and is devoid of a sulcus, although the an- 
terior is considerably flattened. The brachial valve is slightly deeper 
than the pedicle valve and moderately convex in lateral profile. The 
anterior profile is strongly convex but with long and steep lateral 
slopes. The median region is swollen from the umbo to the anterior 
margin, thus forming a poorly defined fold to accommodate the 
anterior flattening of the opposite valve. 
Only approximate measurements in millimeters are possible: Fig- 
ured specimen, U.S.N.M. 125398, length 17 (probably 19 in a com- 
plete specimen), width 21, brachial length 16.7, thickness 10 or I1(?). 
A second specimen of the brachial valve has spines measuring 
about 2.5 mm. long. 
Types—Figured specimen, U.S.N.M. 125398; mentioned speci- 
men, U.S.N.M. 126983. 
Localities —L8; Pio, P12; S103. 
COMPOSITA sp. 1 
A single pedicle valve of a somewhat elongate species of Composita 
is the only representation of this genus to appear in the entire collec- 
tion. 
Types.—Mentioned specimen, U.S.N.M. 126982. 
Locality —L8. 
