FOSSILS FROM NORTHWESTERN AMERICA. | 725 
Lucina acutinineata (Conrad).—Suborbicular ; ligament margin short, straight and 
a little oblique ; posterior margin somewhat truncate widely, nearly direct ; supero-ante- 
rior margin truncate. Surface with concentric lamelliform striae and intermediate fine 
lines ; anteriorly with a slightly prominent fold. Basal margin orbiculate. This species 
is very nearly related to L. contracta, (Say,) a recent shell of the Atlantic coast, and 
fossil in the miocene of Virginia. It differs from Say’s species in being proportionally 
more elevated, and in having a much shorter ligament margin.—Plate 18, figs. 2, 2 a, 0, 
natural size. 
Astoria, Oregon. 
[Length 13 inches; height slightly less than length; thickness ,*%, L.; the more pro- 
minent ridges of the surface nearly a line apart.] 
aie 
ore Tetiina arctata (Conrad).—Oblong subelliptical, compressed ; front very obliquely 
truncate and a little sinuous, below reflected; basal margin arcuate; ligament margin 
declining, arcuate; posterior extremity rounded. Beak nearest the anterior extremity. 
Plate 18, fig. 3, 3 a. rs iy ie 4 
Astoria, Oregon, ; 
. [Length 2 inches ; height 4 7, L.; thickness 285 L. or #2, H.; apical angle 124°. 
* _ Valves very thin.] 
j ee Aaa TELLINA EMACERATA (Conrad).—Elliptical, much compressed; anterior extremity 
> obliquely truncate, straight from the apex, front reflected; dorsal margin posteriorly 
declining ; posterior margin rounded ; inferior margin arcuate. Lateral surface marked 
with fine, regular, closely-arranged, concentric, impressed lines.—Plate 18, fig. 4, natural 
size. 
Sd: Astoria, Oregon, 
[Length 13 lines; height half the length; apical angle about 140°.] ’ 
F TreLLIna aLBarta (Conrad).—Thin, smooth, subtriangular; beaks medial; anterior 
extremity obtuse; posterior margin regularly rounded; basal margin straight at middle. 
“ —Plate 18, fig. 5 bs i be 
Astoria, Oregon. 
TELLINA NasuTA (Conrad).—Subtriangular, convex, anterior side with a slight pro- 
minent fold, angulated anteriorly ; anterior margin curved above, truncated at the extre- 
mity ; posterior margin rounded. Beaks medial. Anterior basal margin arcuated ; basal 
margin tumid near the middle. 
Astoria, Oregon. 
‘ 
Cee TELLINA BITRUNCATA (Conrad).—Elliptical, compressed ; anterior side reflected; ex- “4 3 
| ne tremity truncated ; posterior margin obliquely truncated. Ligament margin short, straight, . 
q . a parallel with the anterior basal margin; basal margin slightly contracted in the middle; 
' posterior extremity acutely rounded, ; | 
: ie Astoria, Oregon. ; i 
A | a ae : 
Nucvuta pivaricata (Conrad).—Subovate, convex, with divaricating strie, Extre- Pe 
pon a, 182 
Wey? 
