509 



apertura coinplanata ; spira subobtecta, subterminali ; labio externo 

 margine acuto, ad latera in auriculis augulatis expanse; labio in- 

 terno septiformi, Isevigato. 



The back more rounded and elevated than in most of the patel- 

 liform species, with the apex nearly terminal, and the margin of 

 the aperture spread at the juncture of the outer and inner Hps into 

 angular auricles. The species here figured agrees much better with 

 the figure in the ' Encyclopedie Methodique/ quoted by Lamarck, 

 than the one figured in the Conch. Illust., which M. Deshayes 

 has named N. Lamarckii. 



New Holland. 



6. Neritina vespeetina (pi. cxiii. f. 131, 132), Nuttall. 



N. testa N. auriculatm simili, sed dorso multiim magis depresso, 

 auriculis late expansis. 



Like N. auriculata (Sp. 5), but much more depressed, and 

 having the auricles very broadly expanded. 



" Sandwich Islands ; on stones in small streams.'' 



7. Neritina Tahitensis (pi. cxiii. f, 133, 134), Lesson. 



N. testa N. auriculata. simili, sed auriculis rotundatis. 

 Differing from N. auriculata (Sp. 5) in having the auricles 

 rounded, so as to give the entire aperture a more oval form. 

 Tahiti ; on stones in small streams. Cuming. 



8. Neritina bicanaliculata (pi. cxiii. f. 135, 136, 137), 

 Eecluz, MS. Mus. Cum. 



N. testa N. auriculata simili, sed magis transverse elongata, 

 magis patelliformi, columella septiformi magis elongata; apice 

 terminali; auriculis canaliformibus. 



More patelHform and depressed than N. auriculata (Sp. 5), 

 with the apex quite terminal. The auricles at the juncture of the 

 inner and outer Hps are narrow and hollow. 



" Island of Luzon ; on stones in small ponds." Cuming. 



9. Neritina crepidularia (pi. cxiii. f. 139-144), Lamarck. 

 N. Tourauensis, Souleyet. N. violacea, Gmel. ? N. melauostoma, 

 Troschel, Pliil. Abbild. und Besch. Conch., t. i. f. 13. 



N. testa transverse ovah, epidermide induta, plermnque pallide 

 fulva, fasciis et lineis fuscis vel violaceis reticulata ; spira brevissima, 

 anfractu singulosubobtecto; apertura magna, carueola, vel violacea; 



3 u 



