68 cragin.] DESCRIPTIONS OF SPECIES. 87 
MYID^, 
Genus CORBULA Bruguiere. 
CORBULA ? MALONIANA Sp. 11. 
PL XIX, fi§. 7. 
I 
This name is provisionally proposed for a small, transverse, tri 
angular-ovate, moderately ventricose cast of a right valve belonging 
apparently to this genus, but unknown as to hinge or shell, obtained 
by Doctor Stanton from the same horizon that yielded the broadly 
triangular examples of Exogyra potosina, at the west base of Malone 
ie ' Mountain, a short distance north of its southern end. The height is 
'" about six-tenths of the length ; the posterior end is slightly produced 
or pointed ; the beak is pyramidal ; the pallial line is coarse and 
strongly impressed. The species should possibly be referred to 
Nesera. 
Measurements. — Height, 5 mm.; length, a little more than 8 mm.; 
breadth indicated for cast (that of the left valve being restored), 
about 4 mm. 
PHOLADIDiE. 
Genus MARTESIA Leach. 
MaRTESIA MALONIANA Sp. II. 
PL XIX, tigs. 3-5. 
The types of this species are two casts of compressed-conoidal 
shape, with portions of the shell, in matrix. They are straight (not 
at all arcuate) and taper rapidly from the large anterior region. The 
compression is scarcely expressed in the umbonal region, but increases 
posteriorly. The base is rectilinear. Radiating downward from 
either beak to the base are two remote, transversely striated furrows, 
of which the anterior is the wider and the posterior is the more 
deeply impressed. 
The markings seen on the casts are apparently an index of those 
peculiar to the shell. The casts do not indicate the character of the 
accessory plates. 
Measurements. — The casts measure, height, 11 mm.; breadth, 10 to 
nearly 11 mm.; length, upward of 15 mm.; the posterior extremity of 
each being broken off. 
ccurrence.— Obtained by Doctor Stanton in No. 13 of his Malone 
Mountain section, on the west side of Malone Mountain, south of west 
from Malone station. Besides the types, a considerable number of 
less satisfactorily preserved casts and fragments of casts were col- 
lected in their borings in fossil wood, at the same locality. 
