Zoological Society, 279 



side of the summit of the operculum, ^A'hich gives to this tooth a 

 lanceolate form. 



The figure published by Mr. Sow-erby under the name of Neritinu 

 viridis, Linn., and which this author saj^s inhabits Antigua, appears 

 to me to be the same as Ner. Rangiana, vctr. minor ; but as I have only 

 his figure to guide me, I cannot state it as a fact. 



8. Nerxta pulligera, Linn., Lamarck (non Lesson, Voy. Coq.). 

 Var. ft. 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. 



* * Auriculatse. 



9. Nerita sxjbauriculata. N. testa ovato-hemisphccncd, convexd, 

 fusco-violascente, punctis albido-lutescentibus dense aspersd ; apice 



brevissimo ; aperturd exths ovatd, postice truncatd, continud, 

 plumbeo-nigrescente, dUatatd; columelld convexo-depressd, sulco 

 obsoleto circumcinctd, anticc vix arcuatd, denticulatd ; labro su- 

 perne in auricuU brevissimd prolongato. 

 Long. 0-52 ad 0-56 ; lat. O'GS ad 0-72; conv. 0-32 ad 0-40 poll. 

 Hab. Jimamailan, isle of Negros : on the Nepa Palm trunks in 

 brackish water. 



This Neritina is very nearly allied to Ner. violacea, Gmcl., 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. Nerita bicanaliculata. N. testd ovatd, postice truncatd, 

 dorso convexd, tenui, peUucidd,fuscescente, lineis violuceo-nigris, 

 crebre et eleganter reticulatd ; apice brevissimo, dorso interdum 

 compresso piano ; labio lato, subconvexo, margine arcuatim tenue 

 denticnlato ; labro postice biauriculato ; auriculis angustis, subtiis 

 canaliculatis. 



Var. ft. T. fuscescente, lineolis obsoletis, interstitiis interdum conico- 

 angustis ; spird integerrimd, puncti/ormi ; auriculis concaviusculis, 

 aperturd pallide fused. 



Var. y. T. pallidiore, vix reticulatd. 



Hab. Island of Camiguing : found in a small pond. Var. ft, 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 

 hitherto known. Its auricles are narrow, convex above, and hollow 

 beneath, or in form of a short canal. 



Operculum oval, flat above, flesh-coloured, and radiated from the 

 summit to the anterior side with five to seven blackish lines ; the 

 anterior side bordered with a blood-coloured zone, enclosed by an- 

 other pellucid zone ; very fine strise spring from the summit, and 

 radiate to the anterior side in an opposite direction to the bands. 



