NERITINA. 



Species 79. (Fig. a, b, Mus. Cumiug.) 



Neritina bicanaliculata. Ner. testa oi-ntd, siiliJe- 

 pressd, ntrinque peculiar iter caiialic/i/ii/o-n/n/a, sjtirti 

 obtique intortd, lamgatu, area cohimclhiri peraiiijilii, 

 aperturd parvd ; pnUkJe. filivuceo-lidni, ii'ujro ivnuc 

 reticulata. 



The double-channelled Neritina. Sliell ovate, ra- 

 ther depressed, peculiarly canaliciilately winged on 

 each side, spire ol)liquely turned in, smooth, colu- 

 mellar area very Lnrge, aperture small ; pale olive- 

 yellow, finely reticulated with black. 



Eecluz, MS., Sowerby, Thesaurus Conch., part 10. p. 50'.). 



Hab. Island of Luzon, Philippines (on stone^^ in small 

 ponds) ; Cuming. 



Peculiarly distinguished by its channelled auricular 

 wings. 



Species SO. (Pig. a, b, Mus. Cuming.) 



Nekitina subauriculata. Ner. tentd ovafd, mlidiiis- 

 ciilii, rpird oblique intortd, concentrire slriuld, nrrd 

 colinneUari perampld, superiie subaitriciihihi ; imllide 

 olioaceo-luted, nigro teiiue reticulata. 



The slightly-eared Neritina. Shell ovate, rather 

 solid, spire obliquely turned in, concentrically stri- 

 ated, columellar area very large, slightly auriculated 

 at the upper part ; pale olive-yellow, finely reticulated 

 with black. 



Reclvz, MS., Sowerby, Thesaurus Conch., part 10. p. .510. 



Hab. Island of Ncgros, Philippines (on the trunks of 

 palms growing in brackish water) ; Cuming. 

 Exactly like the preceding species in detail of painting, 



and very similar in form, the channelled auricles being 



simply indicated. 



Species 81. (Fig. «, i, Mus. Cumuig.) 

 Neritina dilatata. Ner. testa .'ndjorbiciilnri-ovatd, 

 iitriiiqne peridiariler dilalnld, xpird peeidiariter in- 

 tortd, concentrice striata., ared coliim<-IIarl tatissiind, 

 iipertiird parrd ; paltidi ollrnci'o-lnti'd, niijro aperti' 

 prondscue reticulata, area columellari carneold. 

 The dilated Nekitina. Shell suborbiculately ovate. 



peculiarly dilated on each side, spire obliquely turned 

 inwards, coneontrieally striated, columellar area very 

 liroad, aperture small; pale olive-yellow, openly pj-n- 

 miscuously reticulated at the back, columellar aiva 

 earnelion. 



Hroderip, Pro. Zool. Soc. 1833. 



Hub. Tahiti (on stones in rivers) ; Cuming. 



The reticulated painting of this species is more open 



and irregular than in the preceding, and the cohniiellai- 



area is dilated outwards on each side. 



Species 82. (Fig. <?, i, Mus. Cuming.) 

 Neritina Sandwichensis. Ner. testa oblique oratd, 

 ■ipird depresse intortd, Imviyatd, ared colnmetlari In- 



tlnsculd. 



vta 



pr 



idiictd . 



illidi 



oUmceo-luted, linti.s nndnlatis nii/ris concrntriris dni- 

 sissiuie pictd. 



The Sandwich Islands Neritina. Shell oblit|uely 

 ovate, spire depressly turned inwards, smooth, colu- 

 mellar area rather broad, produced into an auricle 

 next tlie spire ; pale olive-yellow, very densely painted 

 with concentric black waved lines. 



Oesiiayes, Anim. sans vert. vol. viii. p. .57!). 

 Neritina Mauritii, Recluz. 



Hab. Sandwich Islands, Mauritius. 



Curiously obliquely convoluted, with the outer surlaiv 

 very closely ))aiuted with concentrically waved black line?. 



Species S3. (Fig. a, b, ^lus. Cuming.) 



Neritina auriculata. Ner. testa ovatd, utriuque m 

 naticalato-anricntatd, spird oblique intortd, dernswtii. 

 striata, ared columellari subampld ; olivaeeo-nKjru 

 ared colmnellari rnfescente. 



The eared Neritina. Shell ovate, conspicuously ca 

 naliculately eared on each side, spire obliquely turnei 

 inwards, decussately striated, columellar area rathe 

 large ; olive-black, columellar area tinged with red. 



Lamarck, Anim. sans vert. vol. viii. p. 572. 



Hab. New Holland. 



The auricles in this species are distinguished from tluisi 



of its allies by a more horizontal lateral gi'owth. 



November, ISoo. 



