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wise, with two other circular strie from the summit to the posterior 
margin; very convex underneath, hollowed at the posterior side for 
the insertion of the muscle, and provided with two teeth at the top ; 
the upper one very short, lamellated, and truncated at the summit; 
the second circular, equally short, dilated into a sort of plate on the 
side of the summit of the operculum, which gives to this tooth a 
lanceolate form. 
The figure published by Mr. Sowerby under the name of Neritina 
viridis, Linn., and which this author says inhabits Antigua, appears 
to me to be the same as Ner. Rangiana, var. minor ; but as I have only 
his figure to guide me, I cannot state it as a fact. 
8. Neriva putticera, Linn., Lamarck (non Lesson, Voy. Coq.). 
Var. 3. T. labio postice aucto. 
Hab. Cagayan, island of Mindanao : on stones in a deep river. 
This prolongation of the posterior border of the columella renders 
this variety remarkable. This Nerite may possibly be found here- 
after biauriculated. 
** Auriculate. 
9. Nerira suBauRicuLaTa. N. testd ovato-hemisphericd, convexd, 
fusco-violascente, punctis albido-lutescentibus dense aspersd ; apice 
brevissimo ; aperturd extis ovatd, postice truncatd, continud, 
plumbeo-nigrescente, dilatatd ; columelld convexo-depressd, sulco 
obsoleto circumcinctd, antice vive arcuatd, denticulatd ; labro su- 
perne in auriculd brevissimd prolongato. 
Long. 0°52 ad 0°56; lat. 0°68 ad 0°72; conv. 0°32 ad 0°40 poll. 
Hab. Jimamailan, isle cf Negros: on the Nepa Palm trunks in 
brackish water. 
This Neritina is very nearly allied to Ner. violacea, Gmel., but is 
smaller, less convex, with the summit more inclined towards the 
margin; the opening truncated posteriorly, dilated at the summit 
and at the base, and auriculated on the superior side. The opercu- 
lum does not differ materially ; it is a little darker above, with a flesh- 
coloured zone on the middle, visible only at its base. 
10. Nerrra picanaticunaTa. WN. testd ovatd, postice truncatd, 
dorso convexd, tenui, pellucidd, fuscescente, lineis violaceo-nigris, 
crebre et eleganter reticulatd ; apice brevissimo, dorso interdum 
compresso plano ; labio lato, subconvero, margine arcuatim tenue 
denticulato ; labro postice biauriculato ; auriculis angustis, subtis 
canaliculatis. 
Var. 3. T. fuscescente, lineolis obsoletis, interstitiis interdum conico- 
angustis ; spird integerrimd, punctiformi ; auriculis concaviusculis, 
aperturd pallide fused. 
Var. y. T. pallidiore, viz reticulatd. 
Hab. Island of Camiguing; found in a small pond. Var. 6, Pas- 
siguing, province of North Ylocos: on stones in a rapid river. Var. y, 
Abulug, province of Cagayan: on stones in a large river. 
A fine Neritina, very distinct from all the auriculated species 
