6 > 
Measurement :—From anterior to posterior, 19; from 
umbones to ventral margin, 9} ; umbones to posterior margin, 
11; thickness (valves united) 53 millim. 
Hab. :—Cape Natal, W. by m 6h miles ; depth, 54 fathoms. 
Bottom, fine sand and alge. 
Cape Natal, W. by N., 124 miles; depth, 85 fathoms. 
Bottom, sand and shells. 
The shell closely resembles NV. Belchert, but may readily be 
distinguished from it by the beautiful lamelle at the posterior 
end. “The specimens vary but little in size and proportions, 
and none of them approach the dimensions of the full-sized 
N. Belchert. 
NUCULANA GEMMULATA, n. sp. (Plate VI., fig. 9). Shell 
resembling N. Jamellata, but with four posterior ribs, sur- 
mounted by gem-like scales, the interstices being smooth, 
excepting for the growth-lines ; the ridges traversing the sur- 
face of the shell are more regular and equal. For the rest of 
the characters the description of NV. damellata will suffice. 
Measurement :—From anterior to posterior, 20; from 
umbones to ventral margin, 9 millim. 
Hab. :—Tugela River mouth, N.W. 20 miles; depth, 
37 fathoms. Umvoti River mouth N. by W. 4 W., 44 miles; 
depth, 27 fathoms. Bottom, sand and shells. 
NUCULANA COMPTA, n.sp. (Plate VI., fig. 10). Shell of a 
moderately solid substance ; outer surface very pale straw 
colour, white towards the umbones, concentrically very closely 
and finely ridged ; ridges rounded or slightly flattened, becoming 
finer on the anterior side, and obsolete on the posterior. 
Posterior dorsal margin nearly straight, or very slightly arcuate, 
terminating abruptly and forming almost a right angle with 
the posterior margin of the shell ; anterior moderately sloping, 
very slightly convex, rounded at the extremity; ventral 
margin strongly arcuate. Cardinal area narrow, concave, 
with a narrow ligament on each side of the umbones. Umbones 
rounded, closely approximating, situated nearer to the anterior 
than to the posterior. Hinge with numerous erect sharp 
teeth ; cartilage pit extremely small, transversely oblong. 
Interior silvery white, abductor scars, and pallial line indistinct. 
Measurement :—From anterior to posterior, 8+; umbones 
to ventral margin, 54 ; thickness (valves united), 44 millim. 
Hab. -—Cape Natal, N. by E., 24 miles; 440 fathoms. 
Two specimens only. 
Unlike most of the species df Nuculana, this shell is not 
rostrate, but rather square on the posterior side. 

