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16. Nerira squarrosa. WN. testd ventricoso-globosd, interdum 
subovatd, superne depressd et subangulatd, epidermide squarrosd, 
maculis rufescentibus angulatis confertis nigro seu olivaceo-mar- 
ginatis pictd, apice rotundatd, aperturd extis subquadratd, intis 
albido-cerulescente ; labio supra lutescente, plano, anticé ruguloso, 
medio arcuaio. 
Var. 6. T. subrubicundd, nigro-fasciatd. 
Var. y. T. roseo-purpurascente, albo-maculatd, labio margine detrito. 
Var. 6. T. roseo-purpurascente, albo-maculatd, nigrescente fasciatd ; 
labio detrito. 
Long. 0°80 ad 0°84; lat. 1-04 ad 1:08; conv. 0°68 ad 0°76 poll. 
Hab. Jimamailan, isle of Negros: on stones in a mountain- 
stream. Var. 6, Ginijeran, isle of Negros: on stones in a sluggish 
river. Var. y and 6, island of Burias. 
Operculum of a Clithon, whitish or rather rosy externally, with 
one or two circular striz in the centre ; of a livid rose-colour, spotted 
with yellow on the interior. Two teeth: the first lamellated, pointed 
at the summit; the lower one circular, narrow, striated lengthwise 
and across, but faintly. Subapophysary canal spotted with livid 
rose, showing below two remote angles, but slightly raised. 
17. Nerrra Sowersrana. N. testd subglobosd, tenu® striatd nigro 
et albido alternatim fasciatd ; fasciis nigris albo-articulatis, albidis 
muculis nigro- marginatis antice sagittatis ornatd ; anfractibus tri- 
bus, convexis ; spird vix prominuld, rotundatd ; aperiurd obliqud 
cinerascente ; labio subconvexo, lutescente, antic denticulato ar- 
cuatoque. 
Var. B. T. cinereo-lutescente, maculis sagittatis ut supra subzonatd ; 
ad suturam maculis arcuatis nigris ornatd. 
Var. y. T. nigerrimd, maculis triangularibus albidis adspersd, ad 
suturam interdum subspinosd. 
Var. 6. T. nigerrimd, maculis raris subpunctatd, zonis duabus lutes- 
centibus cinctd, ad suturam subspinosd. 
Long. 0°56 ad 0°60; lat. 0°64 ad 0°72; conv. 0°48 poll. 
Hab. Sinait, province of North Ylocos, island of Lugon: on the 
stony bed of a small river. Var. /3, y and 4, island of Guimaras : found 
in a small stream on rocks. 
Operculum of a Clithon, deeply hollowed with a circular stria in 
the centre, zoned transversely with bluish in-the anterior portion of 
its external surface ; the interior of a yellowish or livid rose-colour : 
upper tooth citron, short, obtuse, united to the lower one, which is 
smooth, circular, striated lengthwise and across by a short plate, 
which is subsinuous anteriorly. 
I see no difference among all the varieties which I unite to this 
Nerite, except those of colour. The characters of the operculum 
are the same. 
I have very great satisfaction in dedicating this species to that 
scientific conchologist, Mr. G. B. Sowerby. 
18. Nerira Montacuti. N. destd ventricoso-globosd, supra me- 
dium spinis brevibus coronatd, oblique striatd, lutescente, superneé 
