ADDENDA. ti 
1316 Algida, Reeve, passing into the N. levigata, Marr. 
1317 Kieneri, Anton, ss J 
1318 Nodifera, Powis. o N. hirta, Kien. 
1319 33 ss N. monile, Kien. 
1320 Marginulata, Lam., small forms, passing into the N. plani- 
costata, A. Ad. 
1321 Limata, Chem., passing into the N. undata, Marr. 
DES.C RLPT LON. 
Wuatr are the shells described in the following pages ? 
My answer to this question is, I do not know. 
The amount of knowledge is confined to the single specimens 
in most instances, and to three or four at most, in any case, 
These may be isolated individuals, or they may exist in thousands 
in certain localities not yet explored. At present these shells 
appear to me to be distinct, simply because of my ignorance of all 
their alliances, but that this should be the real state of the case is 
exceedingly improbable, if not absolutely impossible. That future 
conchologists will be found to follow any rules I may think proper 
to dictate to them, is neither my wish nor my intention ; if they do 
not act upon their own independent judgment they will not make 
much progress. 
1128 N. nodosa, Marrat.—Shell somewhat turreted, sutures deeply 
grooved, whorls rounded, very strongly noduled, nodules 
large in the centre of the whorls and tapering towards each 
end, those on the last whorl representing a bi-tubercular keel ; 
ribs white, with rather dark bluish-grey broad belts in the 
interstices ; the first four or five whorls of the apex are 
yellow, aperture sub-oval, columella with two broad folds, 
interior brown, with a white central band. Belcher, Malacca, 
45 N. prompta, Marrat.—Shell ovately conical, highly polished, 
pale yellowish white, with two reddish-purple dotted bands, 
~ one in the centre of the body-whorl, the other near the canal 
at the base, whorls rather flattened, ribbed to the base in 
