195 
Hab. Seychelles and Ceylon. 
Length *9, diam. *6 of an inch. 
Remarks.—The markings are very variable, being sometimes ob- 
lique, zigzag lines, extending over the whole surface of the whorls, 
sometimes sagittate or short zigzag spots in transverse series. Indeed 
some specimens are of a uniform dark green. The last whorl some- 
times has two impressed transverse lines. The mouth is nearly two- 
thirds the length of the shell. 
MeELANIA PoLtyGonaTa. MM, testd tuberculatd, elevato-conicd, 
striatd, crassd, nigrd; spird elevatd, conicd, apice erosa; suturd 
pene obsoleta, flexuosd ; anfractibus superné et inferne striatis ; 
medio angulatis ; angulo serie unicd tuberculorum instructo ; tu- 
berculis maximis, transverse angulatis, levibus ; striis transversis 
raris ; anfractu ultimo magno; basi crebre striatd ; aperturd su- 
perne valde acutd, inferne productd et effusd, intus albidd; colu- 
melld albd, flexuosa; operculo parvo, subcentrali. 
Hab. Copan, Central America. 
Length 3:5, diam. 13 inch. 
Remarks.—One of the largest and finest of the Melanie. The 
upper whorls are generally covered with a thick, smooth deposit, 
obliterating the sculpture. On them the tubercles appear to dege- 
nerate into elevated costee. The operculum is much smaller than the 
mouth. The tubercles and striz sometimes produce brown marks 
on the columella and inside the aperture. 
MeEtaAnia DENTICULATA. WM. testd spinosd, ovato-turritd, trans- 
versim striatd, denticulatd, tenui, diaphand, ferrugined, maculis ba- 
diis minutis linearibus ; spird exsertd, conicd, scalariformi, apice 
acuminatd ; suturd lineari ; anfractibus septem, superné angulatis, 
angulo denticulatis ; denticulis parvis, acutis, obliquis; striis trans~ 
versis, parvis, alternantibus, rugosis, maculatis, lineolis longitu- 
dinalibus minutissimis decussatis ; anfractu ultimo parvo, ad-basim 
striato ; aperturd ovatd, inferne effusd; columelld flecuosd, tenut. 
Hab. Mountain streams, isle of Negros, Philippines. 
Length °6, diam. °3 of an inch. 
Remarks.—Allied to M. spinulosa, Lam., but may be distinguished 
by its abrupt denticulations. 
MELANIA ARMILLATA. JM. testd cancellatd, ovato-turritd, cras- 
siusculd, graniferd, viridescenti; spird elevatd, subovatd, apice 
acutd; suturd parvd, crenatd; anfractibus undecim, planatis, 
prope suturam superiorem angulatis, superne albidis, costis longi- 
tudinalibus obliquis graniferis crebris ; granulis rotundatis, albi- 
dis ; anfractu ultimo superné compresso, inferné subturgido ; basi 
transverse striatd; aperturd ovatd, superné acute angulatd, in- 
Serne rotundatd et effusd ; labro inferné producto ; columella in- 
Sern? angulatd, superne recta. 
Hab. India. 
Length 1:4, diam. *5 inch. 
Remarks.—Immediately below the angle of the whorls there is 
