38 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 134 
brachial valve and spines of the Oregon species are not preserved; 
consequently, it is impossible to compare these features with Dunbar’s 
species. The Oregon species differs from P. scoresbyensis Dunbar in 
its narrower outline, smaller ears, and narrower, deeper sulcus. 
Subfamily LinopropucTINAE Stehli, 1954 
LINOPRODUCTUS cf. L. LUTKEWITSCHI (Stepanow) 
Plate 6D, figures 27-29 
Productus lutkewitschi StEpANOoW, Leningrad State Univ., Sci. Bull., Geol.- 
Geogr. ser., vol. 2, p. 127, pl. 1, figs. 5a-c, 1936. 
Linoproductus lutkewitschi (Stepanow) Branson, Geol. Soc. Amer. Mem. 26, 
Pp. 393, 1948. 
Fairly large for the genus, length slightly less than the width; sides 
gently rounded, front margin broadly rounded as shown by the 
growth lamellae ; costellae narrowly rounded and separated by spaces 
about equal to the width of the costellae; 5 or 6 costellae in 5 mm. 
at the valve middle. 
Pedicle valve moderately convex in lateral profile, more narrowly 
convex in anterior profile but with the median region flattened and 
the sides steep. Umbo moderately swollen, beak small; median region 
flattened to gently concave; sides gently convex but steep. Cardinal 
extremities somewhat flattened, marked by a few prominent wrinkles. 
Brachial valve moderately concave in both profiles; most concave 
in the median region. Umbo a shallow pit. Fold broad, low, indis- 
tinct and best defined near the middle. Posterolateral extremities 
flattened and marked by 5 or 6 prominent wrinkles which extend as 
indistinct concentric undulations on the concave portions of the valve. 
Measurements in mm.—Figured hypotype, surface length 80+, 
length 56.1+, width (based on half measure) 62.8. 
Types.—Figured hypotype, U.S.N.M. 125326. 
Localities —S14, $45, S49, S103, S111. 
Discussion —The inconspicuous beak of this species is its most 
striking feature. 
ANIDANTHUS MINOR Cooper, new species 
Plate 6A, figures I-17 
Shell small, length and width nearly equal; cardinal extremities 
forming small ears; sides nearly parallel; front margin broadly 
rounded. Surface costellate, with low, rounded costellae separated 
by spaces of about equal width to that of the costellae; 2 or 3 cos- 
tellae occupying the space of 1 mm. at the front margin and 12 to 15 
