175 
et infra medium zonis nigris lutescente maculatis pictd ; supremd 
latiore ; anfractibus tribus superné depresso-planis ; spird depresso- 
converd ; aperturd dilatatd, rotundatd, albido-lutescente ; labio an- 
gusto, medio concavo, margine denticulato, in centro arcuato. 
Var. (3. T. olivaced, maculis lutescentibus adspersd, ultimo anfractu 
superne convexiusculo, labio denticulato. 
Var. y. T. dilute olivaced, maculis pallidioribus nigro anticé sagit- 
tatis marginatisque ; ultimo anfractu superne subconvexo, labio 
edentulo, integerrimo. 
Var. 6. T. nigerrimd, punctis albis sparsis notatd.; labio denticulato. 
Var. e.? T. fulvd, nigrescente tinctd, sub oculo et lumine punctu- 
lis pellucidis obsitd ; spinis extrorsum curvatis ; ultimo anfractu 
basis costuld notato ; spird viv prominuld. 
Long. 0°76; lat. 0°80 ad 0°88; conv. 0°60 ad 0°64 poll. 
Hab. Island of Burias ;: on stones in a rivulet. 
I consider it my duty to dedicate this Nerite to the learned con- 
chologist Montagu, as a homage due to his talents. 
19. Nerita Donovant. N. testd semiglobosd, tenué et dense striatd, 
viridescente, lineis obliquis purpureo-nigrescentibus, equidistantibus 
undatis ornatd ; anfractibus tribus convezis, supra medium spinis 
incurvis armatis ; apice deroso ; aperturd cerulescente, basi effusd, 
angulosd ; labio angusto, superné calloso, basi concavo, margine 
subrecto denticulato ; dente cardinali majori. 
Var. 3. T. ovatd, nitidd, maculis viridibus et purpurascentibus dense 
tessellatd ; spinosd, ultimo anfractu superneé ascendente, basi costuld 
transversd notato ; spird prominuld. 
Long. 0°50; lat. 0°60; conv. 0°40 poll. Var. 6, long. 0°56; lat. 
0°60; conv. 0°44 poll. 
Hab. Island of Guimaras : on stones in a small stream. 
Whatever the difference of form and colour, it does not appear to 
me possible to distinguish these two shells otherwise than as vari- 
eties of the same type. Their operculum is unknown to me. 
20. Nerira Micuavnt, Récluz in Rev. Cuv. 1841. p. 315. No. 38. 
Var. . T. tenui, lineolis nigris longitudinalibus rectis creberrimis, et 
maculis luteis lined nigrd anticé cinctis concatenatis triserialibusque 
pictd. 
Var. y. T. anfractibus supra medium spinis brevibus angustisque ar- 
matis. 
Hab. Bauang, province of Pangasinan, isle of Lucon: on small 
stones on the bank of a river. 
21. Nerira puLCHELLA. UN. testd subglobosd, nitidd, vir striatd, 
luteo-viridescente, maculis nigris sagittatis et zonis equalibus re- 
motis nigris lutescente articulatis ornatd ; spird nulld ; apice con- 
vero ; aperturd semi-rotundd, cerulescente ; labio angusto, subcon- 
vexo, superne calloso, anticé subrecto, denticulato ; dente cardinali 
majori. 
Var. 3. Testd sordidé purpurascente, albo punctatd et zonis ceruleo- 
viridescentibus albo-maculatis cinctd. 
