72 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 134 
ridges, 1, figured specimen, U.S.N.M. 125319. Locality Sur1r. 
(35) Impression of the interior of another pedicle valve, X 1, figured 
specimen, U.S.N.M. 125318. Locality U.O. 2201-3. 
Ji Heep rode? spy) sss PG eb tee e one oe ee he i 
(36-38) Respectively posterior, ventral, and anterior views of the in- 
ternal impressions of a pedicle valve showing stout median ridge 
and lateral lobes, 1, figured specimen, U.S.N.M. 125325; (39) 
rubber cast prepared from the preceding mold showing a replica of 
the interior of the pedicle valve, X 1, with its ridges and channels. 
Locality 637. 
PLATE 2 
A. Alexema? subquadrata Cooper, new SpecieS...........ccecceccccccccce 
(1-4) Respectively anterior, ventral, side, and posterior views of a 
pedicle valve, X 1, holotype, U.S.N.M. 125328. Locality L8. 
B:. Krotowia parva. Cooper, new Species: .\. 66 oo csccne ewe cs vs laces on ee 
(5-7) Respectively side, ventral, and posterior views of the holotype, 
a pedicle valve, X 1, U.S.N.M. 125355a; (8) ventral view of the 
same specimen, X 2, showing arrangement of fine spines. Locality 
$40. 
(9-11) Respectively dorsal, ventral, and side views of a complete but 
silicified specimen showing beak, I, paratype, U.S.N.M. 125465; 
(12) dorsal view of same specimen showing deeply concave brachial 
valve and beak, < 2. Locality Pro. 
C. Avonta orégonensis Gooper, NEw SPECIES... hice dhic s Mew clems wean micllerinee 
(13) Impression of the exterior of a brachial valve, 1, paratype, 
U.S.N.M. 125321b; (14) ventral view of a pedicle valve showing 
elongated spine bases, X 1, paratype, U.S.N.M. 125321a. Locality 
S49. 
(15-17) Respectively side, ventral, and dorsal views of a complete 
specimen, XI, paratype, U.S.N.M. 125322. Locality S46. 
(18) Impression of the exterior of an exceptionally large brachial 
valve, X 1, paratype, U.S.N.M. 125324. Locality S3o. 
(19, 20) Ventral and side views of an average-sized pedicle valve, 
XI, paratype, U.S.N.M. 125323b; (21-24) respectively posterior, 
ventral, anterior, and side views of a large specimen, X 1, holotype, 
U.S.N.M. 125323a. Locality U.O. 2204-3. 
D. Alexenia? occidentalis Cooper, new SpecieS...........ccccceccccccvecs 
(25-29) Respectively posterior, side, dorsal, ventral, and anterior views 
of a complete specimen, X 1, holotype, U.S.N.M. 125350. Locality 
638. 
(30-33) Respectively posterior, side, ventral, and anterior views of 
a pedicle valve preserving the trail, X 1, paratype, U.S.N.M. 125335. 
Locality U.O. 2204-3. 
(34) Poorly preserved interior of a brachial valve showing part of 
cardinal process, X 1, paratype, U.S.N.M. 125334. Locality U.O. 
2201-4. 
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