DESCRIPTIONS. 83 
to be a very distinct species by most conchologists, but having a 
very fine series of its allies, I am enabled to trace it into 
broader and well-known forms. The shells of this group 
are extremely variable in both form and in the number of 
their ribs.) N. ambigua, Montg., N. annellifera, Reeve, 
N. obtusata and clathratula, A. Ad., N. rotundicostata and 
paucicostata, Marr., are all varieties of one shell, and this 
is another variety. 
869 N. sculpta, Marrat.—Shell ovately-fusiform, white, banded 
with pale rufous, whorls rounded, longitudinally ribbed and 
transversely grooved, slightly coronated at the sutures, aper- 
ture obliquely oval, columella smooth, with a single fold at 
the. base, callous somewhat spreading, white, outer lip 
thickened, with a thin edge, interior plicate. S. Archer, Natal. 
Obs. 
smooth N. compta, A. Ad., to the N. propinqua, J. Sow., 
N. splendidula, D’k’r., and the N. marginulata, Lam., small 
varieties, without the thickened callous. 
This is an interesting shell, showing a passage from the 
1275 N. Hanleyana, Marrat.—Shell ovately-globose, white, with 
pale indistinct yellow bands, whorls round, longitudinally 
costate and transversely grooved, all but the body-whorl 
strongly granular, aperture oval, columella plicate in one, 
almost smooth in another, callous somewhat spreading, outer 
lip very thick, inside closely plicate. 
Obs.—So completely does this shell show the union hetween 
the papillose shells, such as the N. gemmulata, Lam., var. 
verrucosa, A. Ad., N. splendidula, D’k’r., &¢., with such shells 
as’ the N. ambigua, Montg., N. annellifera, Reeve, and the 
N. obtusata, A. Ad., &c., as to leave no doubt about the 
one being a continuation of the other, in a direct line of 
descent. 
793 N. Parva, Marrat.—Shell ovately-conical, white, lined and 
banded with dark brown, longitudinally ribbed and transe- 
versely striated, ribs few and distant, somewhat knotted, 
aperture ovate, columella plicate, callous defined, outer lip 
thick, inner edge denticulated, apex of the spire dark purple. 
