a 
16 
Locality. All the varieties, except Var. C., were found in the 
province of Misamis, in the island of Mindanao. Var. C. was found 
at Gindulman, in the isle of Bohol. All were taken on the trunks 
of trees. 
This is a handsome species; the ivory-like appearance of the 
apex, with its dark border, in most of the varieties, except the white 
one, is remarkable. In fine specimens, the inside of the mouth has 
a satin-like nacreous lustre, bordering on iridescence, something like 
that often seen upon the tendon of a muscle.-—W.J.B. 
Buuinus Evanescens. Bul. testd obtuse conico-pyramidali, sub- 
pupiformi, anfractibus 5, lineis incrementi creberrime striatd ; labro 
subreflexo. 
Var. A. Albido-flavescens ; anfractu penultimo et ultimo purpureo- 
brunneo suturam juxta superne vittata ; strigd basali ad columellam 
approximante purpureo-nigrd. 
Long. 13. Lat. § poll. circ. 
Var. B. Gracilior, alba, strigd basali subpurpured. 
Var. C. Tota alba. 
Legit H. Cuming in insula Lugon. 
Var. A. was taken at Lual, in the province of Pangusinan, on 
leaves of bushes; the other two varieties at Catananan, in the 
province of Tayabas, on leaves of trees.—W.J.B. 
Buuinus vevatus. Bul. testd subpupiformi, anfractibus 5, ultimo 
ceteros equante flavescente ad suturas rubro-brunneo vittatd, an- 
Sractu basali fascid obscura subcentrali cincto, epidermide albente 
meatibus plend, velatd; strigd basali et labii vix reflexi limbo 
rubro-brunneis ; aperturd albd. : 
Long. 15%. Lat. ;% poll. cire. 
Hab. in insula Camote. 
Legit H. Cuming in sylvis, foliis arborum adhzrentem. 
In a great number of the beautiful land-shells collected by Mr. 
Cuming, and herein-before described, the pattern, upon immer- 
sion in water or other fluid, becomes entirely obliterated till evapo- 
ration restores the colours to all their pristine brilliancy. In the 
species now before us, the very reverse is the result of immersion. 
The external whitish porous epidermis which veils the shell when 
dry, suffers the bright colours to shine out when immersed in water. 
Bul. velatus is described above, as it appears on immersion, and 
before it becomes dry: but in the latter state the beauties of the 
shell are shrouded, and the colour of the sutural bands, peeping out 
between interstices in the epidermis, gives to these bands a moni- 
liform appearance. 
I sent to Sir David Brewster, as the highest authority on such 
subjects, four or five species of those land shells from which the 
pattern disappears upon immersion; but I have not as yet forwarded 
to him any upon which the colours come out when so treated, Sir 
David has been so obliging as to send me the following letter, 
which I now lay before the Society :— 
