76 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 134 
PLATE 8 
A. Krotovia pustelaia: (Reysériitic),.. us iwiacics soe. dee chek eee aeeeeean 
(1-5) Respectively posterior, dorsal, ventral, side, and anterior views, 
1, of a nearly complete specimen with outlines restored and pits 
left by spines of the brachial valve in figure 3, hypotype, U.S.N.M. 
124021. Locality U.O. 2204-3. 
B. Probolionia elongata Cooper, new SPECICS.......ccceccecccccccccccces 
(6-8) Respectively side, anterior, and posterior views of the holotype, 
U.S.N.M. 125371a. Locality U.O. 2202-3. 
(9) Anterior view of another specimen larger than the preceding, 
XI, paratype, U.S.N.M. 125372. Locality S4o. 
(10) Dorsal view of an imperfect specimen showing brachial valve, 
diaphragm, and ear, X 1, paratype, U.S.N.M. 125373; (11, 12) re- 
spectively 1 and XX 2 views of the counterpart of the preceding 
specimen showing impression of visceral disk and part of diaphragm. 
Locality S46. 
C. Echinoconchus inexpectatus Cooper, new SPeCi€S.........eceeee eee eeee 
(13-17) Respectively dorsal, anterior, side, posterior, and ventral views 
of a complete specimen (beak restored), 1, U.S.N.M. 125357. 
Locality 638. 
(18) Plasticine replica of the exterior of brachial valve, * 1, made 
from paratype, U.S.N.M. 125359. Locality U.O. 2204-3. 
(19-22) Respectively side, posterior, anterior, and ventral views of 
pedicle valve, X 1, showing rows of pits representing spines, para- 
type, U.S.N.M. 125454. Locality U.O. 2201-1. 
(23) Ventral view of a large pedicle valve showing spine-bearing 
lamellae, 1, paratype, U.S.N.M. 125356. Locality S25. 
(24-26) Respectively posterior, side, and dorsal views of a large speci- 
men preserving the beak, < 1, holotype, U.S.N.M. 125551. Locality 
U.O. 2201-1. 
PLATE 9 
A. Rhynchopora magna Cooper, new SPeCieS........-.cceeesecccscceccess 
(1-5) Respectively anterior, ventral, side, dorsal, and posterior views 
of a nearly perfect young specimen, X I, paratype, U.S.N.M. 1253914. 
Locality S4o. 
(6-10) Respectively ventral, posterior, side, dorsal, and anterior views 
of a well-preserved young individual, 1, paratype, U.S.N.M. 
125390. Locality 639. 
B,. RAVAEROBGNG Spe oe esos Sola on ie penitent et ene aoe ee ace ee 
(11-14) Respectively ventral, dorsal, side, and anterior views, X I, 
figured specimen, U.S.N.M. 125387. Locality U.O. 2201-4. 
C. Stenoscisma mutabile oregonense Cooper, new subspecies..........-.+- 
(15-19) Respectively dorsal, posterior, side, anterior, and ventral 
views of a nearly complete specimen, 1, holotype, U.S.N.M. 
125378; (20) plasticine replica of the exterior of the holotype, X 1, 
showing lateral frills, prepared from natural impression of the ventral 
side of the holotype; (21-25) respectively ventral, posterior, side, 
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