Lt . 
FOSSILS FROM NORTHWESTERN AMERICA. 723 
The joints of the leg figured have a smooth surface. The under margin of the hand 
and thumb is straight, and denticulate. The inner margin of the thumb and finger is 
slightly crenulate. The finger is narrow, slightly arcuate, subacute, and shuts rather 
closely upon the thumb. The length of the hand is nearly 7 of an inch, and its breadth § 
inch ; the carpus has the same length, and is little broader ; its upper and lower margins 
are entire; the next joint preceding is but $ of an inch broad, and apparently somewhat 
shorter than the’ carpus. 
Batanus.—In the soft argillaceous shale, remains of a barnacle are found, but in too 
imperfect a state to be characterized. A figure is given on plate 17, fig. 4. 
4, MOLLUSCA, 
The fossil shells of Astoria have been described for this place by Mr. T. A. Conran, 
‘whose labours in conchology in general, and especially in the department of tertiary 
species, are well known. We insert his descriptions in his own words, adding a few 
measurements from the specimens. 
1. Mya asrupra (Conrad).—Subelliptical, slightly ventricose, widely gaping poste- 
riorly. Surface marked with concentric undulations. Beaks separated, nearly medial, 
slightly prominent. Anterior margin acute, orbiculate ; posterior margin abrupt, arcuate, 
somewhat reflexed ; basal (inferior) margin arcuate ; dorsal margin short, straight, nearly 
parallel with the base.—Plate 17, figure 5, 5 a. 
Astoria, Oregon, 
[Length 2$ inches ; height 5,7, L.; thickness (and breadth of gaping behind) |82, L., 
or +8; H. Apical angle 162°.] 
2. Turacra TRAPEZOIDES (Conrad).—Trapezoidal ; ventricose ; flank flattened, cari- 
nate, side anteriorly compressed. Surface faintly concentric undulate, and neatly but 
unequally marked with concentric striae. Beaks prominent, medial. Posterior margin 
truncated, basal margin tumid at middle.—Plate 17, figs. 6 a, 6 6, natural size. 
Astoria, Oregon. 
[Length 1,4, inches; height ,77, L.; thickness 745, L., or 75 H.; apical angle 140°. 
Cast having the surface faintly concentric undulate. Muscular impressions rather indis- 
tinct, the posterior quite small, palleal sinus large.] 
Sotemya venrricosa (Conrad).—Oblong; ventricose; dorsal and basal margins 
straight and parallel. Anterior side narrowed, the margin orbiculate. Posterior margin 
scalloped, the inferior half truncated obliquely inwards. Beaks distant from the anterior 
extremity.—Plate 17, figs. 7, 8, natural size. 
Astoria, Oregon, 
[Length 32 inches; breadth 13 inches. Lateral surface smooth, radiated with narrow 
bands. } 
Donax? prorexta (Conrad).—Much elongate, ventricose ; anterior margin orbicu- 
late, posterior side produced; basal margin straight; ligament margin straight and 
oblique. Beaks little prominent. Sides somewhat flattened inferiorly, contracted slightly 
