fi 
NUCULA IRREGULARIS, n. sp. (Plate VI., fig. 12). Shell 
obliquely triangular, of a moderately solid substance ; outer 
surface light brown, traversed by numerous somewhat oblique 
shightly waved ridges, which are irregularly divided and diverg- 
ing on the posterior side ; numerous very thin radiating lire 
may also be seen by the aid of a lens. Posterior dorsal margin 
obliquely sloping; anterior nearly vertical, forming a slightly 
acute angle with the umbones. Posterior cardinal area narrow, 
shghtly concave ; anterior broad, forming a slightly concave 
lunule, bordered by a narrow rounded rib, which is roughened 
by the crossing lire. Umbones small, acute, obliquely raised. 
Interior silvery white, margin sharply crenulated ; abductor 
scars of moderate size, broadly oval; pallial line simple. 
Hinge with 17 erect teeth on the posterior side, and seven 
on the anterior; cartilage pit oblique, oblong. 
Measurement :—Anterior to posterior, 8;  umbones to 
posterior end of ventral margin, 8; thickness (valves 
united), 4 millim. 
Hab. :—Struis Point, N.W., 15 miles; depth, 48 fathoms. 
A sculptured shell, more oblique than N. nucleus. 
NUCULA SCULPTURATA, n.sp. (Plate VI., fig. rz). Shell 
obliquely sub-ovate, rather thin, pale; outer surface concen- 
trically rather closely ridged; ridges slopingly flattened on 
the under side, rather sharp above, traversed throughout by 
close distinct radiating sculpture ; posterior side divided by a 
slightly angular depression, from which the ridges run obliquely 
to the margin ; anterior with a rather broad scarcely depressed 
Junule, which is roughened by fine granular diverging ridges. 
Posterior dorsal margin convexly sloping ; anterior concavely 
truncate ; ventral arcuate. Umbones rather small, incurv ed, 
and anteriorly inclined. Interior and hinge, same as in N. 
wregularis. 
Measurement :—Anterior to posterior, 9; umbones to ventral 
margin, 7; thickness (valves united), 5 millim. 
Hab. :—Lat. 33° 3’ S., Long. 27° 57’ E.; depth, 34 fathoms. 
An elaborately sculptured species resembling N. nucleus in 
form. The sharply divaricating ridges on the posterior side 
are remarkable. 
Fam. Carditide. 
CARDITA PULCHERRIMA, n. sp. (Plate VI., fig. 2). Shell roundly 
sub-ovate, of a rather thin substance, white variegated with 
light brown ; ribs 1g in number, rather thick, high, ornamented 
