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. 
Melania polygonata. M. testd tuberculatd , elevato-conicd , 
striata, crassd, nigra; spird elevata, conica, apice erosd; suturd 
pane obsoleta, flexuosd; anfractibus superne et inf erne striatis; 
medio anyulatis; angulo serie unicd tuberculorum instructo; tu¬ 
ber culis maximis, transverse anyulatis, Icevibus; striis transversis 
raris ; anfractuultimo mayno ; basi crebre striata; aperturd su¬ 
perne v aide acuta, inf erne products et effusd, intus albidd; colu¬ 
mella albd, flexuosd; operculo parvo, subcentrali. 
Hab. Copan, Central America. 
Length 3*5, diam. L3 iiTch. 
Remarks. —One of the largest and finest of the Melanice. The 
upper whorls are generally covered with a thick, smooth deposit, 
obliterating the sculpture. On them the tubercles appear to dege¬ 
nerate into elevated costae. The operculum is much smaller than the 
mouth. The tubercles and striae sometimes produce brown marks 
on the columella and inside the aperture. 
Melania denticulata. M. testd spinosd, ovato-turritd, trans- 
versim striata, denticulata, tenui, diaphand,ferruyined, maculis ba- 
diis minutis linearibus; spird exsertd, conica, scalariformi, apice 
acuminatd ; suturd lineari; anfractibus septem, superne anyulatis, 
anyulo denticulatis ; denticulis parvis, acutis, obliquis; striis trans¬ 
versis, parvis, alternantibus, rugosis, maculatis, lineolis lonyitu- 
dinalibus minutissimis decussatis ; anfractu ultimo parvo, ad basim 
striato; aperturd ovatd, inf erne effusd; columella flexuosd, tenui. 
Hab. Mountain streams, isle of Negros, Philippines. 
Length - 6, diam. *3 of an inch. 
Remarks. —Allied to M. spinulosa , Lam., but may he distinguished 
by its abrupt denticulations. 
Melania armillata. M. testd cancellatd, ovato-turritd, cras- 
siusculd, yraniferd, viridescenti; spird elevata, subovatd, apice 
acuta; suturd parvd, crenatd; anfractibus undecim, planatis, 
prope suturam superiorem anyulatis, superne albidis, costis lonyi- 
tudinalibus obliquis yraniferis crebris; granulis rotundatis, albi¬ 
dis; anfractu ultimo superne compresso, inf erne subturgido; basi 
transverse striata; aperturd ovatd, superne acute angulatd, in¬ 
fer ne rotundatd et effusd; labro inf erne producto ; columella in- 
feme angulatd, superne recta. 
Hab. India. 
Length 1*4, diam. *5 inch. 
Remarks .—Immediately below the angle of the whorls there is 
