- 
2) 
m this country, excepting from the figures and descriptions 
given by Hinds, Sowerby, and Reeve, and a single valve in 
the British Museum. The figures in Thes. Couc hi, and Couch. 
Icon., represent a shell with four distinct posterior angles ; 
the fourth angle running from the umbones to the posterior 
‘of the ventral margin is probably much exaggerated, as Hinds 
gives only three angles, the fourth being only very faintly 
indicated, as is the case with all the specimens now to hand. 
The specimens range from 19 to 37 millim. from end to end, 
and vary in w idth, most of them being narrower in_pro- 
portion than that figured in Sowerby and Reeve from the 
Metcalfe collection. The following are the principal localities 
in which they have been dredged :— 
Cape Point Lighthouse, S.W. ? W., 24 miles; depth, 42 
fathoms. (One of the largest specimens taken here). 
Cape Point, W. by S. 4 5S., 3} miles; depth, 34 fathoms. 
(One of the largest specimens taken here.) 
Cape St. Francis, N.E. + N., 26 miles; depth, 75 fathoms 
(smaller specimens). 
Pats 34° 27" S.,; Long..25,. 42° 4570 idepth... 256) tathonrs 
(medium sized and small specimens). 
Cape Natal, N. by E., 24 miles; depth, 440 fathoms. One 
small specimen. 
NUCULANA LAMELLATA, n. sp. (Plate VI., fig. 8). Shell elon- 
‘gately oblong, inequilateral, rather solid, compressed, white, 
shining ; concentrically rather closely ridged; ridges on the 
anterior surface flattened (leaving narrow shallow grooves) 
gradually becoming sharper and more distinct towards the 
posterior end, where they are raised into sharp thin lamelle ; 
near the middle of the valves the ridges are somewhat broken 
and divided, with an oblique tendency. Umbones small, 
slightly incurved, situated nearer to the anterior end than 
to the posterior. Cardinal area long, depressed, rather con- 
cave, with an extremely thin ligament on the inner edge. 
Anterior dorsal margin rather short, obliquely sloping ; pos- 
terior longer, nearly straight, slightly sloping. Posterior side 
triangular, with three angular ribs from the umbones to the 
margin, with two concave spaces between, and traversed by 
the before-mentioned lamelle. Interior of the valves slightly 
iridescent, with small somewhat indistinct anterior and posterior 
muscular scars, and a clearly defined pallial line rather near 
the margin, with a broad posterior sinus. Hinge slightly 
sloping on each side, and furnished with very numerous erect 
teeth ; cartilage pit, small, obliquely triangular. 
