Zoological Society, 279 



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. Nerita pulligera, Linn., Lamarck (non Lesson, Voy. Coq.). 

 Var. j3. T. lahio postice aucto. 



Hah. 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 subauriculata. N. testa ovato-hemisphcericd, convexd, 

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

 brevissimo ; aperturd extiis ovatd, postice truncatd, continud, 

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

 obsoleto circumcinctd, antice via: 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. 



Hah. Jimamailan, isle of 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. Nerita bicanaliculata. iV". testd ovatd, postice truncatd, 

 dorso convexd, tenui, pellucidd, fuscescente, lineis violaceo-nigris, 

 crehre et eleganter reticulatd ; apice brevissimo, dorso interdum 

 compresso piano ; lahio lato, suhconvexo, margine arcuatim tenue 

 denticulato ; labro postice hiauriculato ; auriculis angustis, subtils 

 canaliculatis. 



Var. /3. T. fuscescente, lineolis obsoletis, interstitiis interdum conicO' 

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

 aperturd pallide fused. 



Var. y. T. pallidiore, viw reticulatd. 



Hah. Island of Camiguing : found in a small pond. Var. /3, 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 striae spring from the summit, and 

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



